C Program to Replace All Occurrence of a Character in a String

In this tutorial, i am going to show you how to replace all occurrences of a character in a string with help of for loop, while loop and functions in c programs.

All C Programs and Algorithm To Replace All Occurrence of a Character in a String

  • Algorithm To Replace All Occurrence of a Character in a String
  • C Program To Replace All Occurrence of a Character in a String using For Loop
  • C Program To Replace All Occurrence of a Character in a String using While Loop
  • C Program To Replace All Occurrence of a Character in a String using Function

Algorithm To Replace All Occurrence of a Character in a String

Use the following algorithm to write a program to replace all occurrence of a character in a string; as follows:

  1. Input string from user, store it in some variable.
  2. Input character to replace and character new character from user, store it in some variables.
  3. Iterate a loop from start of string str to end.
  4. Inside the loop, swap all old character with new character and terminate the loop.
  5. Print result.

C Program To Replace All Occurrence of a Character in a String using For Loop

/* C Program to Replace All Occurrence of a Character in a String */
 
#include <stdio.h>
#include <string.h>
 
int main()
{
  	char str[100], ch, Newch;
  	int i;
 
  	printf("\n Please Enter any String :  ");
  	gets(str);
  	
  	printf("Enter a character replace: ");
  	scanf("%c", &ch);
  	
  	getchar();
  	
    printf("\nEnter character to replace  with  %c : ",ch);
  	scanf("%c", &Newch);
  	
  	for(i = 0; i <= strlen(str); i++)
  	{
  		if(str[i] == ch)  
		{
  			str[i] = Newch;
 		}
	}
	
	printf("\n The Final String after Replacing All Occurrences of '%c' with '%c' = %s ", ch, Newch, str);
	
  	return 0;
}

The result of the above c program; as follows:

Please Enter any String :  c [email protected]
Enter a character replace: @
Enter character to replace  with  @ : a
The Final String after Replacing All Occurrences of '@' with 'a' = c programmer 

C Program To Replace All Occurrence of a Character in a String using While Loop

/* C Program to Replace All Occurrence of a Character in a String */
 
#include <stdio.h>
#include <string.h>
 
int main()
{
  	char str[100], ch, Newch;
  	int i = 0;
 
  	printf("\n Please Enter any String :  ");
  	gets(str);
  	
    printf("Enter a character replace: ");
  	scanf("%c", &ch);
  	
  	getchar();
  	
  	printf("\n Please Enter the New Character :  ");
  	scanf("%c", &Newch);
  	
  	while(str[i] != '\0')
  	{
  		if(str[i] == ch)  
		{
  			str[i] = Newch;
 		}
 		i++;
	}
	
	printf("\n The Final String after Replacing All Occurrences of '%c' with '%c' = %s ", ch, Newch, str);
	
  	return 0;
}

The result of the above c program; as follows:

Please Enter any String :  [email protected]@@o
Enter a character replace: @
Please Enter the New Character :  l
The Final String after Replacing All Occurrences of '@' with 'l' = helllo 

C Program To Replace All Occurrence of a Character in a String using Function

/* C Program to Replace All Occurrences of a Character in a String */
 
#include <stdio.h>
#include <string.h>
void Replace_AllOccurrence(char *str, char ch, char Newch);
 
int main()
{
  	char str[100], ch, Newch;
  	int i = 0;
 
  	printf("\n Please Enter any String :  ");
  	gets(str);
  	
  	printf("Enter a character replace: ");
  	scanf("%c", &ch);
  	
  	getchar();
  	
  	printf("\nEnter character to replace  with  %c : ",ch);
  	scanf("%c", &Newch);
  	
  	Replace_AllOccurrence(str, ch, Newch);
  	
  	printf("\n The Final String after Replacing All Occurrences of '%c' with '%c' = %s ", ch, Newch, str);
	
  	return 0;
}
void Replace_AllOccurrence(char *str, char ch, char Newch)
{
	int i;
	for(i = 0; str[i] != '\0'; i++)
	{
		if(str[i] == ch)
		{
			str[i] = Newch;
		}  
	}
}

The result of the above c program; as follows:

Please Enter any String :  c programming
Enter a character replace: m
Enter character to replace  with  m : @
The Final String after Replacing All Occurrences of 'm' with '@' = c [email protected]@ing 

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