C Program To Replace First Occurrence of a Character in a String

C Program To Replace First Occurrence of a Character in a String

C program to replace the first occurrence of a character in a string; Through this tutorial, we will learn how to replace first occurrence of a character in a string using for loop, while loop, recursion and functions in c programs.

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

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

Algorithm To Replace First Occurrence of a Character in a String

Use the following algorithm to write a program to replace first occurrence of a character with 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 old character with new character and terminate the loop.
  5. Print result.

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

#include <stdio.h>
#include <string.h>
 
int main()
{
    char s[1000],c1,c2;  
    int  i;
 
    printf("Enter  the string : ");
    gets(s);
    
	printf("Enter a character replace: ");
    c1=getchar();
    getchar();
    printf("\nEnter character to replace  %c with: ",c1);
    c2=getchar();
    printf("\n before replace:%s",s);
 
    for(i=0;s[i];i++) 
	{  
		if(s[i]==c1)
		{
		   s[i]=c2;
		   break;
	    }
	}
	   
    printf("\nafter replace:%s",s);
 	 
     
    return 0;
}

The output of the above c program; as follows:

Enter  the string : hello
Enter a character replace: h
Enter character to replace  h with: w
before replace:hello
after replace:wello

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

/* C Program to Replace First 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("\nEnter character to replace  %c with: ",ch);
  	scanf("%c", &Newch);
  	
  	while(i <= strlen(str))
  	{
  		if(str[i] == ch)  
		{
  			str[i] = Newch;
  			break;
 		}
 		i++;
	}


	printf("\n The Final String after Replacing First occurrence of '%c' with '%c' = %s ", ch, Newch, str);
	
  	return 0;
}

The output of the above c program; as follows:

Please Enter any String :  hello
Enter a character replace: h
Enter character to replace  h with: w
The Final String after Replacing First occurrence of 'h' with 'w' = wello 

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

/* C Program to Replace First Occurrence of a Character in a String */
 
#include <stdio.h>
#include <string.h>

void Replace_FirstOccurrence(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("\n Please Enter the Character that you want to Replace :  ");
  	scanf("%c", &ch);
  	
  	getchar();
  	
  	printf("\n Please Enter the New Character :  ");
  	scanf("%c", &Newch);
  	
  	Replace_FirstOccurrence(str, ch, Newch);
  	
  	printf("\n The Final String after Replacing First occurrence of '%c' with '%c' = %s ", ch, Newch, str);
	
  	return 0;
}

void Replace_FirstOccurrence(char *str, char ch, char Newch)
{
	int i;

	for(i = 0; str[i] != '
/* C Program to Replace First Occurrence of a Character in a String */
#include <stdio.h>
#include <string.h>
void Replace_FirstOccurrence(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("\n Please Enter the Character that you want to Replace :  ");
scanf("%c", &ch);
getchar();
printf("\n Please Enter the New Character :  ");
scanf("%c", &Newch);
Replace_FirstOccurrence(str, ch, Newch);
printf("\n The Final String after Replacing First occurrence of '%c' with '%c' = %s ", ch, Newch, str);
return 0;
}
void Replace_FirstOccurrence(char *str, char ch, char Newch)
{
int i;
for(i = 0; str[i] != '\0'; i++)
{
if(str[i] == ch)
{
str[i] = Newch;
break;
}  
}
}
'; i++) { if(str[i] == ch) { str[i] = Newch; break; } } }

The output of the above c program; as follows:

Please Enter any String :  fans
Please Enter the Character that you want to Replace :  f
Please Enter the New Character :  v
The Final String after Replacing First occurrence of 'f' with 'v' = vans 

C Program To Replace First Occurrence of a Character in a String using Recursion

 #include <stdio.h>
#include <string.h>
 
void replacechar(char *s,char c1,char c2)
{
	static int i=0;
 
    
 
    if(s[i]==c1)
    {
     	s[i]=c2;
     	return;
    }
    i++;
    replacechar(s,c1,c2);
 
	 
	     
       
	   
  	 
}
 
 
int main()
{
 
    char s[1000],c1,c2;  
  
    printf("Enter  the string : ");
    gets(s);
    
	printf("Enter a character replace: ");
    c1=getchar();
    getchar();
    printf("\nEnter character to replace  %c with: ",c1);
    c2=getchar();
    printf("\n before replace:%s",s);
 
    replacechar(s,c1,c2);
	   
    printf("\nafter replace:%s",s);
 	 
     
    return 0;
 
     
     
} 

The output of the above c program; as follows:

Enter  the string : sony
Enter a character replace: s
Enter character to replace  s with: w
before replace:sony
after replace:wony

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AuthorAdmin

My name is Devendra Dode. I am a full-stack developer, entrepreneur, and owner of Tutsmake.com. I like writing tutorials and tips that can help other developers. I share tutorials of PHP, Python, Javascript, JQuery, Laravel, Livewire, Codeigniter, Node JS, Express JS, Vue JS, Angular JS, React Js, MySQL, MongoDB, REST APIs, Windows, Xampp, Linux, Ubuntu, Amazon AWS, Composer, SEO, WordPress, SSL and Bootstrap from a starting stage. As well as demo example.

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