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FindAndReplaceString.c
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FindAndReplaceString.c
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// C program to search and replace
// all occurrences of a word with
// other word. https://www.geeksforgeeks.org/c-program-replace-word-text-another-given-word/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// Function to replace a string with another
// string
char* replaceWord(const char* stringInput,
const char* searchWord,
const char* replacementWord)
{
char* result;
int replacementWordLength = strlen(replacementWord);
int searchWordLenght = strlen(searchWord);
const char terminationCharacter = '\0';
// Loop through the whole input string
// Counting the number of times old word
// occur in the string
int i; //Making available to other functions outside for loop
int occurences; //Making available to other functions outside for loop
for (i = 0, occurences=0; stringInput[i] != terminationCharacter; i++) {
//Counting Occurences in the Input Array that contain strings.
if (strstr(&stringInput[i], searchWord) == &stringInput[i]) {
occurences++;
// Jumping to index after the old word.
i += searchWordLenght - 1;
}
}
//-------------------------------------------------------
// After counting Occurences
// Allocating memory for the result variable
// Making new string of enough length
result = (char*)malloc(
i + occurences * (replacementWordLength - searchWordLenght) + 1
);
// Loop stringInput and replace words
i = 0;
while (*stringInput) {
// Compare the substring with the result
if (strstr(stringInput, searchWord) == stringInput) {
// Copy string to the result array
strcpy(&result[i], replacementWord);
// Add length of replacement word to the Loop increment
i += replacementWordLength;
// After adding a string, increase an array length
// Add searchWordLenght to the String Input???
stringInput += searchWordLenght;
}
else
// If stringInput does not match searchable word
// Set result item to the stringInput item
result[i++] = *stringInput++;
}
// Add terminationCharacter at the end of result array
result[i] = terminationCharacter;
return result;
}
// Driver Program
int main()
{
char* result = NULL;
result = replaceWord("xxforxx xx for xx", "xx", "Geeks");
printf("New String: %s\n", result);
free(result);
return 0;
}