Detect Underflow in Unsigned Subtraction

Code

#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=0;
    if(a>=b){
        *diff=a-b;
    }
    else{
        *carry=1;
        *diff=256+(a-b);
    }
}

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;
}

Solving Approach

simple memory concepts helped me to solve the problem