#include <stdio.h>
#include <stdint.h>

int main(void) {
	
	static uint8_t data_array[20] = "ABC";
	static uint8_t s[4] = "ABC";
	static uint8_t length = 3;
	
	uint8_t bool = 1;
	for (int i = 0; i < length; i++) {
	    if (s[i] != data_array[i]) {
	        bool = 0;
	        break;
	    }
	}
	if (bool) {
	    printf("pattern found\n");
    }
    return 0;
}