u8 overflow

#include <stdio.h>

unsigned char inc(unsigned char x, unsigned char amount) {
    if (x > 255-amount) {
        return 255;
    }
    else {
        return x+amount;
    }
}

int main(void) {
    unsigned char x = 250;
    x = inc(x,10);
    unsigned char y = 250;
    y += 10;
    printf("%d, %d\n", y, x);
    return 0;
}

C

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