[觀點][C語言]在while(負數)判斷是TRUE，在if(負數)判斷也是TRUE

#include <stdio.h>



int foo(int x, int y)

{

    while(x)

    {

        ++x;

        ++y;

    }

    if(y)

    {

        --y;

    }

    return x+y;

}



int main()

{

    int answer;



    answer = foo(-1, -1);

    printf("%d\n", answer);



    answer = foo(0, -1);

    printf("%d\n", answer);



    return 0;

}

[answer]
0
-2