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Showing content from https://cplusplus.com/reference/cstring/strncmp/ below:

function

strncmp

int strncmp ( const char * str1, const char * str2, size_t num );

Compare characters of two strings

Compares up to num characters of the C string str1 to those of the C string str2.
This function starts comparing the first character of each string. If they are equal to each other, it continues with the following pairs until the characters differ, until a terminating null-character is reached, or until num characters match in both strings, whichever happens first.

Parameters

str1: C string to be compared.
str2: C string to be compared.
num: Maximum number of characters to compare.
size_t is an unsigned integral type.

Return Value Returns an integral value indicating the relationship between the strings:
return value indicates <0 the first character that does not match has a lower value in str1 than in str2 0 the contents of both strings are equal >0 the first character that does not match has a greater value in str1 than in str2
Example

/* strncmp example */
#include <stdio.h>
#include <string.h>

int main ()
{
  char str[][5] = { "R2D2" , "C3PO" , "R2A6" };
  int n;
  puts ("Looking for R2 astromech droids...");
  for (n=0 ; n<3 ; n++)
    if (strncmp (str[n],"R2xx",2) == 0)
    {
      printf ("found %s\n",str[n]);
    }
  return 0;
}

Output:

Looking for R2 astromech droids...
found R2D2
found R2A6