#include stdio.h
#include string.h
int main() {
  char str1[] = "abcd", str2[] = "abCd", str3[] = "abcd";
  int result;
  result = strcmp(str1, str2);
  printf("strcmp(str1, str2) = %d\n", result);
  result = strcmp(str1, str3);
  printf("strcmp(str1, str3) = %d\n", result);
 return 0;
}

Output for the following program