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C library - strrchr() function

The C library strrchr() function accepts two argument − searches for the last occurrence of the character c (an unsigned char) in the string pointed to, by the argument str.

Here are some key point which highlights its importance −

• This function is used to set for finding the last occurence of a specified characters.
• The main operation is file path manipulation, parsing URL's and handling the data formats.
• It saves the time and reduce error.

Following is the syntax of the C library function strrchr() −

char *strrchr(const char *str, int c)

This function takes two parameters −

• str − This is the C string.

• c − This is the character to be located. It is passed as its int promotion, but it is internally converted back to char.

This function returns a pointer to the last occurrence of character in str. If the value is not found, the function returns a null pointer.

Following is the basic C library program that shows the usage strrchr() function.

#include <stdio.h>
#include <string.h>

int main () {
   int len;
   const char str[] = "https://www.tutorialspoint.com";
   const char ch = '.';
   char *ret;

   ret = strrchr(str, ch);

   printf("String after |%c| is - |%s|\n", ch, ret);
   
   return(0);
}

The above code produces the following result −

String after |.| is - |.com|

Below the program uses strrchr() to search for a character in a substring of a given string.

#include <stdio.h>
#include <string.h>

int main() {
   const char str[] = "Hello, World!";
   const char ch = 'W';

   // Search in the substring "World!"
   char* ptr = strrchr(str + 7, ch); 

   if (ptr) {
       printf("'%c' found at position %ld\n", ch, ptr - str);
   } else {
       printf("'%c' not found in the substring\n", ch);
   }

   return 0;
}

On execution of above code, we get the following result −

'W' found at position 7

In this example, we will find the last occurence of a character using strrchr().

#include <stdio.h>
#include <string.h>

int main() {
   const char str[] = "Tutorialspoint";
   const char ch = 'n';

   char* ptr = strrchr(str, ch);

   if (ptr) {
       printf("Last occurrence of '%c' in \"%s\" is at index %ld\n", ch, str, ptr - str);
   } else {
       printf("'%c' is not present in \"%s\"\n", ch, str);
   }

   return 0;
}

After executing the code, we get the following result −

Last occurrence of 'n' in "Tutorialspoint" is at index 12

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