C library function - strstr()

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Description

The C library function char *strstr(const char *haystack, const char *needle) function finds the first occurrence of the substring needle in the string haystack. The terminating '\0' characters are not compared.

Declaration

Following is the declaration for strstr() function.

char *strstr(const char *haystack, const char *needle)

Parameters

  • haystack -- This is the main C string to be scanned.

  • needle -- This is the small string to be searched with-in haystack string.

Return Value

This function returns a pointer to the first occurrence in haystack of any of the entire sequence of characters specified in needle, or a null pointer if the sequence is not present in haystack.

Example

The following example shows the usage of strstr() function.

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


int main()
{
   const char haystack[20] = "TutorialsPoint";
   const char needle[10] = "Point";
   char *ret;

   ret = strstr(haystack, needle);

   printf("The substring is: %s\n", ret);
   
   return(0);
}

Let us compile and run the above program, this will produce the following result:

The substring is: Point


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