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ComputingCString.h

memcmp

Compare byte string
+ View other versions (3)

Interface

#include <string.h>
int memcmp (const void *b1, const void *b2, size_t len)

Description

The memcmp function compares byte string b1 against byte string b2. Both strings are assumed to be len bytes long.

Example:

Example - Compare byte string
Workings
#include <stdio.h>
#include <string.h>
int main()
{
  // define two identical arrays
  char u[5] = {1, 2, 3, 4, 5}, v[5] = {1, 2, 3, 4, 5};
  if (!memcmp(u, v, 5*sizeof(char)))
    printf("The two arrays store the same elements.\n");
  else
    printf("The two arrays store different elements.\n");
  return 0;
}
Solution
Output:
The two arrays store the same elements.

Return Values

The memcmp function returns zero if the two strings are identical, otherwise returns the difference between the first two differing bytes (treated as unsigned char values, so that '\200' is greater than '\0,' for example). Zero-length strings are always identical.