124. Detect Underflow in Unsigned Subtraction

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

void subtract_with_underflow(uint8_t a, uint8_t b, uint8_t *diff, uint8_t *carry) {
    // Write logic here
    *carry = (b <= a) ? 0 : 1;       // underflow if b <= a
    *diff = (a - b);       // wraps around automatically
}

int main() {
    uint8_t a, b, diff, carry;
    scanf("%hhu %hhu", &a, &b);
    subtract_with_underflow(a, b, &diff, &carry);
    printf("diff = %u, carry = %u", diff, carry);
    return 0;
}