string.h (c)

1) strcmp
bil = strcmp(char *strA, char *strB);
if (bil == 0){
>> strA = strB
}



2) strstr
char *s1 = "amanamanam";
char *s2 = "ana";
char *s3;

s3 = strstr(s1, s2);
printf("%p - %p = %f\n",s3, s1, (double)(s3 - s1));
>>>>0x40085e - 0x40085c = 2.000000