c - "new_dollars = dollars + cents/100"没有变化

Question

在输出中，new_dollars总是显示美元数量，所以我不知道如何解决这个问题。请帮我找出问题所在。

int main(void)
{
    int dollars, cents, count, new_dollars;

    for ( count = 1; count <= 10; ++count){
        printf ("Enter dollars: ");
        scanf ("%i", &dollars);

        printf ("Enter cents: ");
        scanf ("%i", &cents);

        if ( cents >= 100 ){
            cents = cents % 100;
            new_dollars = dollars + cents / 100;
            printf ("%i\n", new_dollars);
            printf ("$%i.%2i\n\n", new_dollars, cents);
        }
        else {        
            printf ("$%i.%2i\n\n", dollars, cents);
        }
    }

    return 0;
}

Answer 1

评论者关于整数除法的看法是正确的。试试这个，它交换了执行计算的两行顺序，因此当您需要时，分仍然具有有用的值:

int main(void)
{
    int dollars, cents, count, new_dollars;

    for ( count = 1; count <= 10; ++count){
        printf ("Enter dollars: ");
        scanf ("%i", &dollars);

        printf ("Enter cents: ");
        scanf ("%i", &cents);

        if ( cents >= 100 ){
            new_dollars = dollars + cents / 100;
            cents = cents % 100;
            printf ("%i\n", new_dollars);
            printf ("$%i.%2i\n\n", new_dollars, cents);
        }
        else {        
            printf ("$%i.%2i\n\n", dollars, cents);
        }
    }

    return 0;
}