Add Signed and Unsigned Integers Safely

Code

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

int16_t signed_unsigned_sum(int8_t a, uint8_t b) {
    // Your logic here
    int16_t res = (int16_t)a;
    int16_t temp_b = 0;
    temp_b |= b; // this is now just b but as an int16

    res += temp_b;

    return res;
}

int main() {
    int8_t a;
    uint8_t b;
    scanf("%hhd %hhu", &a, &b);
    printf("%d", signed_unsigned_sum(a, b));
    return 0;
}

Solving Approach