The strncmp() function compares n characters in the source string with the destination string.

It returns a 0 if both strings are equal, and nonzero otherwise.

int strncmp(char *str1,char* str2,int len)

Example:
 
void main()

{

  char str1[20] = "Hello World";

  if(strncmp(str1,"Hello",5)==0)

  {

     printf( "Strings match" );

  }

}

Output:

  Strings match