100 Interview Questions -

Question 1: Question: Write a C program that prints numbers from 1 to 10 using a for loop. Expected Output:
```
1 2 3 4 5 6 7 8 9 10
```
Question 2: Question: Create a C program that prints the even numbers from 2 to 20 using a while loop. Expected Output:
```
2 4 6 8 10 12 14 16 18 20
```
Question 3: Question: Develop a program that calculates the sum of numbers from 1 to 100 using a for loop. Expected Output:
```
The sum of numbers from 1 to 100 is 5050.
```
Question 4: Question: Write a C program that prints the first 10 terms of the Fibonacci sequence using a do-while loop. Expected Output:
```
Fibonacci series: 0 1 1 2 3 5 8 13 21 34
```
Question 5: Question: Create a program that prompts the user to enter a positive integer and then prints the multiplication table for that number from 1 to 10 using a for loop. Expected Output:
```
Enter a number: 7
Multiplication table for 7:
7 x 1 = 7
7 x 2 = 14
...
7 x 10 = 70
```
Question 6: Question: Develop a C program that prints a pattern of asterisks in the shape of a right-angled triangle using nested for loops. Expected Output:
```
*
**
***
****
*****
```
Question 7: Question: Write a program that calculates the factorial of a user-entered number using a while loop. Expected Output:
```
Enter a number: 5
The factorial of 5 is 120.
```
Question 8: Question: Create a C program that checks if a user-entered number is a prime number using a for loop. Expected Output:
```
Enter a number: 17
17 is a prime number.
```
Question 9: Question: Develop a program that finds and displays the prime numbers in a given range (e.g., 1 to 100) using a for loop. Expected Output:
```
Prime numbers in the range 1 to 100 are: 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
```
Question 10: Question: Write a C program that prints the ASCII values and characters for all printable characters (from ' ' to '~') using a for loop. Expected Output:
```
ASCII values and characters for printable characters:
' ' (Space) - ASCII: 32
'!' - ASCII: 33
'"' - ASCII: 34
...
'~' - ASCII: 126
```
Question 11: Question: Create a C program that calculates the sum of all even numbers between 1 and 50 using a for loop. Expected Output:
```
The sum of even numbers from 1 to 50 is 650.
```
Question 12: Question: Write a C program that checks if a user-entered number is a perfect number. A perfect number is a positive integer that is equal to the sum of its proper divisors (excluding itself). Expected Output:
```
Enter a number: 28
28 is a perfect number.
```
Question 13: Question: Develop a program that calculates the factorial of a user-entered number using a do-while loop. Expected Output:
```
Enter a number: 6
The factorial of 6 is 720.
```
Question 14: Question: Create a C program that prints the squares of numbers from 1 to 10 using a for loop. Expected Output:
```
1^2 = 1
2^2 = 4
3^2 = 9
...
10^2 = 100
```
Question 15: Question: Write a C program that calculates the sum of a geometric series (1 + 2 + 4 + 8 + ... + 2^n) using a for loop. Prompt the user for the number of terms (n). Expected Output:
```
Enter the number of terms (n): 5
The sum of the geometric series is 31.
```
Question 16: Question: Develop a C program that prints the first n terms of the square root series (1, sqrt(2), sqrt(3), ...) using a for loop. Expected Output:
```
Enter the number of terms (n): 4
Square root series: 1.000 1.414 1.732 2.000
```
Question 17: Question: Create a program that calculates the sum of an arithmetic series (3 + 7 + 11 + ... + 3n - 1) using a for loop. Prompt the user for the number of terms (n). Expected Output:
```
Enter the number of terms (n): 5
The sum of the arithmetic series is 75.
```
Question 18: Question: Write a C program that prints the numbers from 100 to 1 in reverse order using a while loop. Expected Output:
```
100 99 98 97 96 ... 4 3 2 1
```
Question 19: Question: Develop a program that generates and displays the Collatz sequence starting from a user-entered number. The Collatz sequence for a positive integer n is defined as follows: if n is even, divide it by 2; if n is odd, multiply it by 3 and add 1. Expected Output:
```
Enter a number: 10
Collatz sequence: 10 5 16 8 4 2 1
```
Question 20: Question: Create a C program that calculates and displays the GCD (greatest common divisor) of two user-entered numbers using the Euclidean algorithm in a while loop. Expected Output:
```
Enter the first number: 24
Enter the second number: 18
The GCD of 24 and 18 is 6.
```
Question 21: Question: Write a C program to check if a user-entered number is a palindrome. A palindrome is a number that reads the same forwards and backwards. Expected Output:
```
Enter a number: 121
121 is a palindrome.
```
Question 22: Question: Create a C program that prints a pattern of stars in the shape of a diamond using nested for loops. Expected Output:
```
   *
  ***
 *****
*******
 *****
  ***
   *
```
Question 23: Question: Develop a program that generates and displays a random number between 1 and 100. Prompt the user to guess the number, and provide hints. Expected Output:
```
Guess the number (1-100): 50
Try higher.
Guess the number (1-100): 75
Try lower.
Guess the number (1-100): 63
Congratulations! You guessed the number (63).
```
Question 24: Question: Write a C program that calculates the sum of the series 1 - 1/2 + 1/3 - 1/4 + ... - 1/n for a user-entered positive integer n. Expected Output:
```
Enter a positive integer (n): 5
The sum of the series is -0.78333.
```
Question 25: Question: Create a C program that simulates a simple game of rock-paper-scissors. The user plays against the computer. Expected Output:
```
Choose your move (rock, paper, scissors): rock
Computer's move: scissors
You win!
```
Question 26: Question: Develop a program that calculates the value of π using the Leibniz formula. Prompt the user for the number of terms (n) to use in the formula. Expected Output:
```
Enter the number of terms (n): 1000000
The value of π is approximately 3.14159.
```
Question 27: Question: Write a C program that generates a random password of a specified length (e.g., 8 characters) containing a mix of letters (both uppercase and lowercase) and numbers. Expected Output:
```
Your random password: K4rW8p7X
```
Question 28: Question: Create a C program that simulates a simple guessing game. The program generates a random number between 1 and 100, and the user must guess it within a limited number of attempts. Expected Output:
```
Guess the number (1-100). You have 5 attempts.
Attempt 1: 50
Try higher.
Attempt 2: 75
Try lower.
...
Congratulations! You guessed the number (63) in 4 attempts.
```
Question 29: Question: Develop a program that calculates the sum of all prime numbers between 1 and 100 using a for loop. Expected Output:
```
The sum of prime numbers between 1 and 100 is 1060.
```
Question 30: Question: Write a C program that generates and displays a magic square of order 3. A magic square is a square matrix in which the sum of the numbers in each row, column, and both main diagonals is the same. Expected Output:
```
Magic Square:
2 7 6
9 5 1
4 3 8
```
Question 31: Question: Create a C program that prints a right-angled triangle pattern of asterisks using nested for loops. Expected Output:
```
*
**
***
****
*****
```
Question 32: Question: Develop a program that prints a hollow square pattern of asterisks with a user-specified side length. Expected Output:
```
Enter the side length of the square: 5
*****
*   *
*   *
*   *
*****
```
Question 33: Question: Write a C program that prints a mirrored right-angled triangle pattern of numbers. Expected Output:
```
    1
   12
  123
 1234
12345
```
Question 34: Question: Create a program that prints a pyramid pattern of asterisks with a user-specified height. Expected Output:
```
    *
   ***
  *****
 *******
*********
```
Question 35: Question: Develop a C program that prints a diamond pattern of numbers with a user-specified number of rows. Expected Output:
```
    1
   121
  12321
 1234321
123454321
 1234321
  12321
   121
    1
```
Question 36: Question: Write a C program that prints a right-angled triangle pattern of uppercase letters starting from 'A'. Expected Output:
```
A
AB
ABC
ABCD
ABCDE
```
Question 37: Question: Create a program that prints a hollow right-angled triangle pattern of asterisks with a user-specified height. Expected Output:
```
Enter the height of the triangle: 5
*
**
* *
*  *
*****
```
Question 38: Question: Develop a C program that prints an inverted pyramid pattern of numbers. Expected Output:
```
12345
 1234
  123
   12
    1
```
Question 39: Question: Write a program that prints a square pattern of numbers with each row starting from 1 and incrementing by 1. Expected Output:
```
12345
12345
12345
12345
12345
```
Question 40: Question: Create a C program that prints a pattern of the letter 'X' formed by asterisks. Expected Output:
```
*       *
 *     *
  *   *
   * *
    *
   * *
  *   *
 *     *
*       *
```
Question 41: Question: Write a C program to calculate the sum of the first 10 natural numbers using a while loop. Expected Output:
```
The sum of the first 10 natural numbers is 55.
```
Question 42: Question: Create a C program that prints a hollow square pattern of asterisks with a user-specified side length. Expected Output:
```
Enter the side length of the square: 5
*****
*   *
*   *
*   *
*****
```
Question 43: Question: Write a C program that checks if a given number is a power of two (2^n). Expected Output:
```
Enter a number: 16
16 is a power of 2.
```
Question 44: Question: Create a C program to find the factorial of a user-entered number using a while loop. Expected Output:
```
Enter a number: 5
The factorial of 5 is 120.
```
Question 45: Question: Develop a program that calculates the sum of all odd numbers from 1 to 100 using a for loop. Expected Output:
```
The sum of odd numbers from 1 to 100 is 2500.
```
Question 46: Question: Write a C program that calculates the sum of the digits of a user-entered integer. Expected Output:
```
Enter an integer: 12345
The sum of the digits is 15.
```
Question 47: Question: Create a program that calculates the LCM (Least Common Multiple) of two user-entered numbers. Expected Output:
```
Enter two numbers (separated by a space): 12 18
The LCM of 12 and 18 is 36.
```
Question 48: Question: Develop a C program that checks if a user-entered string is a palindrome (reads the same forwards and backwards). Expected Output:
```
Enter a string: radar
"radar" is a palindrome.
```
Question 49: Question: Write a C program that calculates the sum of all the multiples of 3 and 5 between 1 and 100. Expected Output:
```
The sum of multiples of 3 and 5 between 1 and 100 is 2418.
```
Question 50: Question: Create a program that finds and displays the first N prime numbers. Expected Output:
```
Enter the value of N: 10
The first 10 prime numbers are: 2 3 5 7 11 13 17 19 23 29
```
Question 51: Question: Develop a program that checks if a user-entered year is a leap year using a logical operator. Expected Output:
```
Enter a year: 2024
2024 is a leap year.
```
Question 52: Question: Write a C program that calculates and displays the GCD (greatest common divisor) of two user-entered numbers. Expected Output:
```
Enter two numbers (separated by a space): 24 18
The GCD of 24 and 18 is 6.
```
Question 53: Question: Create a program that calculates the sum of squares of the first N natural numbers. Expected Output:
```
Enter the value of N: 4
The sum of squares of the first 4 natural numbers is 30.
```

Question 54: Question: Develop a program that finds the smallest and largest elements in an array of integers. Expected Output:

Enter the number of elements in the array: 6
Enter the elements (separated by spaces): 18 7 42 10 31 55
The smallest element in the array is 7, and the largest element is 55.

Question 55: Question: Write a C program that generates and displays a random password of a specified length (e.g., 8 characters) using a logical approach. Expected Output:
```
Your random password: K4rW8p7X
```
Question 56: Question: Create a program that checks if a user-entered number is a perfect number. Expected Output:
```
Enter a number: 28
28 is a perfect number.
```
Question 57: Question: Develop a C program that prints a pattern of stars in the shape of a right-angled triangle using nested for loops. Expected Output:
```
*
**
***
****
*****
```
Question 58: Question: Write a program that calculates the sum of even numbers between 1 and 50 using a while loop. Expected Output:
```
The sum of even numbers from 1 to 50 is 650.
```
Question 59: Question: Create a C program that checks if a given number is a palindrome using a logical approach. Expected Output:
```
Enter a number: 121
121 is a palindrome.
```
Question 60: Question: Write a C program that checks if a user-entered string is a palindrome using logical operations. Expected Output:
```
Enter a string: radar
"radar" is a palindrome.
```
Question 61: Question: Develop a C program that finds and displays the first N Fibonacci numbers. Expected Output:
```
Enter the value of N: 8
The first 8 Fibonacci numbers are: 0 1 1 2 3 5 8 13
```
Question 62: Question: Write a C program to reverse a user-entered string without using any built-in string functions. Expected Output:
```
Enter a string: programming
Reversed string: gnimmargorp
```
Question 63: Question: Create a program that checks if a given year is a leap year or not using a logical approach. Expected Output:
```
Enter a year: 2100
2100 is not a leap year.
```
Question 64: Question: Develop a C program that calculates the product of digits in a user-entered integer. Expected Output:
```
Enter an integer: 12345
The product of the digits is 120.
```
Question 65: Question: Write a program that determines if a user-entered number is prime or composite. Expected Output:
```
Enter a number: 17
17 is a prime number.
```
Question 66: Question: Create a C program that counts and displays the number of words in a user-entered sentence. Expected Output:
```
Enter a sentence: This is a sample sentence.
The number of words in the sentence is 5.
```
Question 67: Question: Develop a program that calculates the sum of all natural numbers divisible by 3 or 5 between 1 and 100. Expected Output:
```
The sum of natural numbers divisible by 3 or 5 between 1 and 100 is 2418.
```
Question 68: Question: Write a C program to check if a user-entered number is an Armstrong number (narcissistic number). Expected Output:
```
Enter a number: 153
153 is an Armstrong number.
```
Question 69: Question: Create a program that calculates the area of a triangle when the user provides the lengths of its three sides. Expected Output:
```
Enter the lengths of three sides (separated by spaces): 5 12 13
The area of the triangle is 30 square units.
```
Question 70: Question: Develop a C program to check if a user-entered number is a strong number. Expected Output:
```
Enter a number: 145
145 is a strong number.
```
Question 71: Question: Write a C program that checks if a user-entered number is a palindrome using a logical approach. Expected Output:
```
Enter a number: 121
121 is a palindrome.
```
Question 72: Question: Create a program that calculates the sum of squares of the first N even natural numbers. Expected Output:
```
Enter the value of N: 4
The sum of squares of the first 4 even natural numbers is 120.
```
Question 73: Question: Develop a C program that checks if a user-entered year is a leap year without using logical operators. Expected Output:
```
Enter a year: 2024
2024 is a leap year.
```
Question 74: Question: Write a program that calculates the sum of cubes of the first N odd natural numbers. Expected Output:
```
Enter the value of N: 5
The sum of cubes of the first 5 odd natural numbers is 135.
```
Question 75: Question: Create a C program that checks if a user-entered string is a pangram (contains all English alphabet letters). Expected Output:
```
Enter a string: The quick brown fox jumps over the lazy dog.
The string is a pangram.
```
Question 76: Question: Develop a program that calculates and displays the HCF (Highest Common Factor) of two user-entered numbers. Expected Output:
```
Enter two numbers (separated by a space): 24 36
The HCF of 24 and 36 is 12.
```
Question 77: Question: Write a C program that calculates the sum of the squares of prime numbers between 1 and 50. Expected Output:
```
The sum of squares of prime numbers between 1 and 50 is 2418.
```
Question 78: Question: Create a program that checks if a user-entered number is an abundant number. Expected Output:
```
Enter a number: 12
12 is an abundant number.
```
Question 79: Question: Develop a C program that checks if a given string is a palindrome using pointers. Expected Output:
```
Enter a string: racecar
"racecar" is a palindrome.
```
Question 80: Question: Write a program that calculates the sum of digits of a user-entered number using a logical approach. Expected Output:
```
Enter a number: 12345
The sum of the digits is 15.
```
Question 81: Question: Create a C program to find and display the prime factors of a user-entered number. Expected Output:
```
Enter a number: 60
The prime factors of 60 are: 2 3 5
```
Question 82: Question: Develop a program that calculates the difference between the sum of squares and the square of the sum of the first N natural numbers. Expected Output:
```
Enter the value of N: 5
The difference is 170.
```
Question 83: Question: Write a C program that checks if a user-entered number is a strong number using logical operations. Expected Output:
```
Enter a number: 145
145 is a strong number.
```
Question 84: Question: Create a program that calculates and displays the LCM (Least Common Multiple) of three user-entered numbers. Expected Output:
```
Enter three numbers (separated by spaces): 12 18 24
The LCM of 12, 18, and 24 is 72.
```
Question 85: Question: Develop a C program that calculates the sum of natural numbers divisible by both 3 and 5 between 1 and 100. Expected Output:
```
The sum of natural numbers divisible by both 3 and 5 between 1 and 100 is 315.
```
Question 86: Question: Write a program that checks if a user-entered number is a Kaprekar number. Expected Output:
```
Enter a number: 9
9 is a Kaprekar number.
```
Question 87: Question: Create a C program to find the sum of the series: 1 + 1/4 + 1/9 + 1/16 + ... + 1/n^2. Expected Output:
```
Enter the value of n: 4
The sum of the series is approximately 1.42361.
```
Question 88: Question: Develop a program that checks if a user-entered sentence is a palindrome (ignoring spaces and case). Expected Output:
```
Enter a sentence: A man, a plan, a canal, Panama.
The sentence is a palindrome.
```
Question 89: Question: Write a C program that calculates and displays the difference between the sum of even-indexed elements and odd-indexed elements in an array. Expected Output:
```
Enter the number of elements in the array: 5
Enter the elements (separated by spaces): 4 7 2 9 6
The difference is 7.
```
Question 90: Question: Create a program that calculates the value of π using the Monte Carlo method for a user-specified number of iterations. Expected Output:
```
Enter the number of iterations: 1000000
The value of π is approximately 3.14159.
```
Question 91: Question: Write a C program that generates the first N prime numbers and displays them in a spiral pattern. Expected Output:
```
Enter the value of N: 10
Prime Numbers in a Spiral:
17 16 15 14 13
18  5  4  3 12
19  6  1  2 11
20  7  8  9 10
21 22 23 24 25
```

Question 92: Question: Create a program that simulates a basic ATM machine. The user can withdraw, deposit, or check the balance. Expected Output: (Interaction example)

Welcome to the ATM!
Select an option:
1. Withdraw
2. Deposit
3. Check Balance
4. Exit
Enter your choice: 1
Enter the amount to withdraw: 100
Successfully withdrawn $100. Current balance: $900

Question 93: Question: Develop a C program that simulates a simple tic-tac-toe game for two players. Expected Output: (Sample game interaction)

Player 1, enter your move (row and column): 2 1
Board after move:
1 - -
X - -
- - -
Player 2, enter your move (row and column): 1 2
Board after move:
1 O -
X - -
- - -
...

Question 94: Question: Write a C program to find and display the longest word in a user-entered sentence. Expected Output:
```
Enter a sentence: The quick brown fox jumps over the lazy dog.
The longest word in the sentence is "jumps".
```

Question 95: Question: Create a program that generates a random maze and finds a path from the start to the end point. Expected Output:

Random Maze:
# # # # # # # # # # #
S       #   #       #
# # #   # # #   # # #
#   #   #       #   #
#   # # #   # # # # #
#   #           #   E
# # # # # # # # # # #
Path:
S   * * * * * *   *
    *       #   * #
# # #   # # #   # #
#   #   #       # #
#   # # #   # # # #
#   #           # *
# # # # # # # # # #

Question 96: Question: Develop a C program that simulates a simple Blackjack card game between the user and the computer. Expected Output: (Sample game interaction)
```
Welcome to Blackjack!
Player's Hand: 7 9
Computer's Hand: 5 ?
Do you want to hit or stand? (h/s): h
Player's Hand: 7 9 Q
...
```
Question 97: Question: Write a program to calculate the sum of prime numbers in the Fibonacci sequence up to a user-entered limit. Expected Output:
```
Enter the limit: 50
The sum of prime Fibonacci numbers up to 50 is 104.
```

Question 98: Question: Create a C program that counts the number of occurrences of each word in a user-entered text document. Expected Output: (Sample input and output)

Enter the text:
This is a sample text. This is a sample document.
Word Count:
"This" occurs 2 times.
"is" occurs 2 times.
"a" occurs 2 times.
"sample" occurs 2 times.
"text." occurs 1 time.
"document." occurs 1 time.

Question 99: Question: Develop a program that calculates and displays the sum of digits of factorial of a user-entered number. Expected Output:
```
Enter a number: 5
The sum of digits of 5! is 3.
```
Question 100: Question: Write a C program that generates and displays the first N numbers of the Lucas sequence. Expected Output: Enter the value of N: 8 The first 8 Lucas numbers are: 2 1 3 4 7 11 18 29

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Name		Name	Last commit message	Last commit date
Latest commit History 43 Commits
Full Pyramid Pattern of Numbers		Full Pyramid Pattern of Numbers
Full Pyramid of Numbers in 180 Degree		Full Pyramid of Numbers in 180 Degree
Half Pyramid Pattern of Numbers		Half Pyramid Pattern of Numbers
How to write a function to swap?		How to write a function to swap?
Inverted Half Pyramid of Numbers		Inverted Half Pyramid of Numbers
Naive Approach to check Prime number in C		Naive Approach to check Prime number in C
Program To Check Leap Year		Program To Check Leap Year
Program To Check Neon Number		Program To Check Neon Number
Program To Convert Fahrenheit To Celsius		Program To Convert Fahrenheit To Celsius
Program To Find Factorial of a Number		Program To Find Factorial of a Number
Program To Find LCM of Two Numbers		Program To Find LCM of Two Numbers
Program To Print ASCII Value of a Character		Program To Print ASCII Value of a Character
Program To Print Triangle		Program To Print Triangle
Program To Reverse a Number		Program To Reverse a Number
Program to Add Two Complex Numbers		Program to Add Two Complex Numbers
Program to Calculate Sum of Natural Numbers		Program to Calculate Sum of Natural Numbers
Program to Check Armstrong Number		Program to Check Armstrong Number
Program to Check Prime Number using Most Efficient sqrt(N)		Program to Check Prime Number using Most Efficient sqrt(N)
Program to Check Prime Number using sqrt(N)		Program to Check Prime Number using sqrt(N)
Program to Check Prime Numbers using Wilson’s Theorem		Program to Check Prime Numbers using Wilson’s Theorem
Program to Check Vowel or Consonant		Program to Check Vowel or Consonant
Program to Check Whether a Given Number is Even or Odd		Program to Check Whether a Given Number is Even or Odd
Program to Check Whether a Number is Prime or Not		Program to Check Whether a Number is Prime or Not
Program to Check Whether a Number is a Palindrome or Not		Program to Check Whether a Number is a Palindrome or Not
Program to Display Armstrong Number Between Two Intervals		Program to Display Armstrong Number Between Two Intervals
Program to Display Prime Numbers Between Intervals		Program to Display Prime Numbers Between Intervals
Program to Find All Factors of a Natural Number		Program to Find All Factors of a Natural Number
Program to Find the Size of int, float, double and char		Program to Find the Size of int, float, double and char
Program to Find the Sum of Fibonacci Numbers at Even Indexes up to N Terms		Program to Find the Sum of Fibonacci Numbers at Even Indexes up to N Terms
Program to Generate Multiplication Table		Program to Generate Multiplication Table
Program to Make a Simple Calculator		Program to Make a Simple Calculator
Program to Print Alphabets From A to Z Using Loop		Program to Print Alphabets From A to Z Using Loop
Program to Print Armstrong Numbers Between 1 to 1000		Program to Print Armstrong Numbers Between 1 to 1000
Program to Print Fibonacci Series		Program to Print Fibonacci Series
Program to Print Number Pattern		Program to Print Number Pattern
Program to Print Prime Numbers From 1 to N		Program to Print Prime Numbers From 1 to N
Program to Swap two Numbers		Program to Swap two Numbers
README.md		README.md
program to Check Whether a Number is Positive or Negative or Zero		program to Check Whether a Number is Positive or Negative or Zero
program to Find the Largest Number Among Three Numbers		program to Find the Largest Number Among Three Numbers
program to demonstrate between the given intervals using pow() an armstrong number		program to demonstrate between the given intervals using pow() an armstrong number

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