Detect Circular Pattern Match

Code

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

uint8_t is_circular_match(uint16_t reg, uint16_t target) {
    // Your code here
    volatile int i;
    for(i=1;i<=16;i++){
        reg = (reg<<i) | (reg>>(16-i));
        reg &= 0xFF;
        if(target==reg){
            return 1;
        }
    }
    return 0;
}

int main() {
    uint16_t reg, target;
    scanf("%hu %hu", &reg, &target);
    printf("%hhu", is_circular_match(reg, target));
    return 0;
}

Solving Approach

Circular shift left a maximum of 16 times, if the target matches the reg after a shift operation, pattern is detected.