C Program to Find First Occurrence of a Character in a String

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

All C Programs to Find First Occurrence of a Character in a String

  • C Program to Find First Occurrence of a Character in a String using For Loop
  • C Program to Find First Occurrence of a Character in a String using While Loop
  • C Program to Find First Occurrence of a Character in a String Using Recursion
  • C Program to Find First Occurrence of a Character in a String using Function

C Program to Find First Occurrence of a Character in a String using For Loop

#include <string.h>
 
int main()
{
    char s[1000],c;  
    int i,n,k=0;
 
    printf("Enter  the string : ");
    gets(s);
    printf("Enter character to be searched: ");
    c=getchar();
    
    for(i=0;s[i];i++)  
    {
    	if(s[i]==c)
    	{
		  k=1;
    	  break;
		}
 	}
    if(k)
 	    printf("character  %c  is first occurrence at location:%d ",c,i);
    else
        printf("character is not in the string ");
 
 	 
     
    return 0;
}

The result of the above c program; as follows:

Enter  the string : hello programmer
Enter character to be searched: e
character  e  is first occurrence at location:1 

C Program to Find First Occurrence of a Character in a String using While Loop

/* C Program to find First Occurrence of a Character in a String */
 
#include <stdio.h>
#include <string.h>
 
int main()
{
  	char str[100], ch;
  	int i, Flag;
  	i = Flag = 0;
 
  	printf("\n Please Enter any String :  ");
  	gets(str);
  	
  	printf("Enter character to be searched: ");
  	
  	scanf("%c", &ch);
  	
  	while(str[i] != '\0')
  	{
  		if(str[i] == ch)  
		{
  			Flag++;
			break;    	
 		}
 		i++;
	}
    if(Flag == 0)
  	{
  		 printf("character is not in the string ");
	}
	else
	{
	  printf("character  %c  is first occurrence at location:%d ",ch,i);
	}	
  	return 0;
}

The result of the above c program; as follows:

Please Enter any String :  hello programer
Enter character to be searched: e
character  e  is first occurrence at location:1 

C Program to Find First Occurrence of a Character in a String Using Recursion

 #include <string.h>
 
 
int check(char *s,char c)
{
    static int i;
    if(!s[i])
    {
        return -1;
	}
	else
	{
		 if(s[i]==c)
		 return i;
		 i++;
		 check(s,c);
	}
 
    
 	
 	 
 	
}
int main()
{
    char s[1000],c;  
    int n;
 
    printf("Enter  the string : ");
    gets(s);
    printf("Enter character to be searched: ");
    c=getchar();
    n=check(s,c);
 
     
    if(n>-1)
 	    printf("character  %c  is first occurrence at location:%d ",c,n);
    else
        printf("character is not in the string ");
        return 0;
 }

The result of the above c program; as follows:

Enter  the string : welcome to programming world
Enter character to be searched: w
character  w  is first occurrence at location:0 

C Program to Find First Occurrence of a Character in a String using Function

#include <string.h>
 
int check(char *s,char c)
{
    int i,k=0;
      for(i=0;s[i];i++)  
    {
    	if(s[i]==c)
    	{
		  k=1;
    	  break;
		}
 	}
   if(k)
   return i;
   else
   return -1;
 	
	  
 }
int main()
{
 
   char s[1000],c;  
    int n;
 
    printf("Enter  the string : ");
    gets(s);
    printf("Enter character to be searched: ");
    c=getchar();
    n=check(s,c);
 
     
    if(n>-1)
 	    printf("character  %c  is first occurrence at location:%d ",c,n);
    else
        printf("character is not in the string ");
 
 	 
     
    return 0;
 
     
     
}

The result of the above c program; as follows:

Enter  the string : Hello
Enter character to be searched: o
character  o  is first occurrence at location:4 

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