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

    *diff=a-b;
    *carry=(b>a)?1:0;
    /*if((a+b)>128)
    {
        *diff=a-b;
        *carry=0;
    }
    else if((a-b)==0) 
    {
       *diff=a-b;
        *carry=0; 
    }
    else if (((a+b)-256)==255)
    {
        *diff=a+b-256;
        *carry=1;
    }
    else
    {
        *diff=a-b;
        *carry=1;
    }*/
}

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;
}