strchr() in C

Purpose of strchr()

strchr() is one of the inbuilt string function in c programming which is used to find the first occurrence of a character chr in a string str.

How strchr() Works

The following diagram clearly illustrate the working principle of strchr() inbuilt string function in C.

In the above diagram strchr() takes two parameters say str and chr. str is a string whereas chr is a character. If a character in chr presents in a string str, then strchr() will return the string str starting from a character in chr, If a character is not found in a string, then strchr() returns null

Syntax - strchr()

• strchr() accepts two parameters.
• First parameter must be a string whereas second parameter must be a character.
• To use strchr() inbuilt string function in C, we need to declare #include<string.h> header file.

strchr (str, chr);

C Program - Using strchr()

Let us work through strchr() function. In the following program we will find the first occurrence of a character chr in a string str.

#include <stdio.h>
#include<string.h>
int main()
{
char str1[] = "Bangalore", chr = 'g';
char *chrpos;
chrpos = strchr(str1, chr);
if(chrpos)
printf("%s", chrpos);
return 0;
}

galore

C Program - Without strchr()

Let us print the string from the first occurrence of a character chr without using inbuilt string function strchr().

#include <stdio.h>
#include<string.h>
int main()
{
char str[] = "Bangalore", chr = 'g';
char str1[12], i, j, k = 0;
for(i=0; str[i]!='\0'; i++){
if(str[i]==chr)	{
for(j=i; str[j]!='\0'; j++){
str1[k] = str[j];
k++;
}
str1[k]='\0';
break;
}
}
printf("%s",str1);
return 0;
}

galore

Did You Know?

When strchr() fails to find the occurrence of a character chr in a string str, then it returns null string.

#include <stdio.h>
#include<string.h>
int main()
{
char str1[] = "Bangalore", chr = 'z';
char *chrpos;
chrpos = strchr(str1, chr);
printf("%s", chrpos);
return 0;
}

(null)

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