Syntax

#include <string.h>
int strncmp(const char *string1, const char *string2, size_t count);

strncmp compares the first count bytes of string1 and string2.

strncmp returns a value indicating the relationship between the substrings, as follows: compact break=fit.

Value

Meaning
Less than 0
substring1 less than substring2
0
substring1 equivalent to substring2
Greater than 0
substring1 greater than substring2

This example demonstrates the difference between strcmp and strncmp.

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

#define  SIZE          10

int main(void)
{
   int result;
   int index = 3;
   char buffer1[SIZE] = "abcdefg";
   char buffer2[SIZE] = "abcfg";
   void print_result(int, char *, char *);

   result = strcmp(buffer1, buffer2);
   printf("Comparison of each character\n");
   printf("  strcmp: ");
   print_result(result, buffer1, buffer2);
   result = strncmp(buffer1, buffer2, index);
   printf("\nComparison of only the first %i characters\n", index);
   printf("  strncmp: ");
   print_result(result, buffer1, buffer2);
   return 0;
   /****************************************************************************
      The output should be:

      Comparison of each character
        strcmp: "abcdefg" is less than "abcfg"

      Comparison of only the first 3 characters
        strncmp: "abcdefg" is identical to "abcfg"
   ****************************************************************************/
}

void print_result(int res,char *p_buffer1,char *p_buffer2)
{
   if (0 == res)
      printf("\"%s\" is identical to \"%s\"\n", p_buffer1, p_buffer2);
   else
      if (res < 0)
         printf("\"%s\" is less than \"%s\"\n", p_buffer1, p_buffer2);
      else
         printf("\"%s\" is greater than \"%s\"\n", p_buffer1, p_buffer2);
}

• strcmp
  
• strcmpi
  
• strcoll
  
• strcspn
  
• stricmp
  
• strnicmp
  
• wcscmp
  
• wcsncmp

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