strrchr() in C

Purpose of strrchr()

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

How strrchr() Works

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

In the above diagram strrchr() takes two parameters. First parameter is a string whereas as second parameter is a character. If a character chr present in a string, then strrchr() will return a string str starting from the last occurrence of a character in a string. If not it returns null.

Syntax - strrchr()

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

strrchr(str, chr);

C Program - Using strrchr()

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

#include <stdio.h>
#include<string.h>
int main()
{
char str[] = "DayDreamer";
char chr = 'D', *chpos;
chpos = strrchr(str, chr);
printf("%s",chpos);
return 0;
}

Dreamer

C Program - Without strrchr()

#include <stdio.h>
#include<string.h>
int main()
{
char str[20] = "DayDreamer";
char chr = 'D', i, j, k;
for(i=0; str[i]!='\0'; i++){
//finding length of a string
}
for(j=i-1; j>=0; j--){
if(str[j]==chr)
{
for(k=j; k<i; k++)
printf("%c",str[k]);
return 0;
}
}
return 0;
}

Dreamer

Did You Know?

• strchr() used to find a last occurrence of a character in a string.
• strrchr() used to find a first occurrence of a character in a string.

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