IT1050-Tutorial-02

Objectives : Convert C programs to C++

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Exercise 1 - Calculations

Convert the C program given below which converts a length given in cm to inches to a C++ program.

Please Note that the input command in C++ is std::cin. This is a representation of the Keyboard.

e.g.

float data1;
int data2;
scanf("%f", &data1); --> std::cin >> data1;
scanf("%d", &data2); --> std::cin >> data2; 

You already know that printf() in C is std::cout in C++ e.g.

printf("Hello World") --> std::cout << "Hello World";

2.54cm = 1 inch

#include <stdio.h>
void main(void) 
{
    float cm, inches;
    printf("Enter a length in cm : ");
    scanf("%f",&cm);
    inches = cm / 2.54;
    printf("Length in inches is %f \n", inches);
}   

Exercise 2 - Selection

Convert the C program given below which calculates an employee's salary to a C++ program.

Input Type, Salary, otHours

Type = 1
OtRate = 1000
Type = 2
OtRate = 1500
Type = 3
OtRate = 1700

Please Note that the input command in C++ is std::cin. This is a representation of the Keyboard.

#include <stdio.h>
void main(void)
{
   double salary, netSalary;
   int etype, otHrs, otRate;
   printf("Enter Employee Type : ");
   scanf("%d", &etype);
   printf("Enter Salary  : ");
   scanf("%f", &salary);
   printf("Enter OtHrs : ");
   scanf("%d", &otHrs); 
   
   switch (etype) {
      case 1 :
          otRate = 1000;
          break;
      case 2 :
          otRate = 1500;
          break;
      default :
          otRate = 1700;
          break;
   }


   netSalary = salary + otHrs* otRate;
   printf("Net Salary is %f ", netSalary);
}

Exercise 3 - Repeatition

Convert the C program given below which calculates the Factorial of a number that you input from the keyboard to a C++ program.

Please Note that the input command in C++ is std::cin. This is a representation of the Keyboard.

#include <stdio.h>
void main(void)
{
    int no;
    long fac;

    printf("Enter a Number : ");
    scanf("%d", &no);

    fac = 1;
    for (int r=no; r >= 1; r--) {
        fac = fac * r;
    }

    printf("Factorial of %d is %ld\n", no, fac);    
}

 

Exercise 4 - Functions

Write a program to calculate the function called nCr which is defined as

nCr = n!/ r!(n−r)!

Where n! is the factorial of n.

Implement the functions

long Factorial(int no);
long nCr(int n, int r);

Do not modify the main function.

#include <iostream>

long Factorial(int no);
long nCr(int n, int r);

int main() {
  int n, r;
  std::cout << "Enter a value for n ";
  std::cin >> n;
  std::cout << "Enter a value for r ";
  std::cin >> r;
  std::cout << "nCr = ";
  std::cout << nCr(n,r);
  std::cout << std::endl;
}