C 中变量运算的错误结果

Question

我正在尝试编写这段代码：

#include <stdio.h>
#include <cs50.h>
#include <math.h>

int main(void)
{
    float input;
    int quarters, cdimes, ldimes, nickels, pennies, left = 0, overleft, overleft2 = 0;
   
    do
    {
        input = get_float("Enter a positive value between 0 and 1: ");
    }
    while (input <= 0);
    int cents = round(input * 100);
    
    if (cents >= 25)
    {
        quarters = cents/25;
        **left = cents-(quarters*25);**
        printf ("Number of quarters is %i and the money left is %i", quarters, left);
    }
   else if (cents >= 10)
   {
        cdimes = cents/10; 
        **overleft2 = cents-cdimes*10;**
        printf ("Number of cdimes is %i and overleft2 is %i", cdimes, overleft2);
   }

         if (left >= 10)
        {   
        ldimes = left/10;
        overleft = left - ldimes*10;
        printf ("Number of ldimes is %i. Over left is %i", ldimes, overleft);
        }

但是在突出显示的部分，程序给出了错误的值。例如，当我输入数字 0.6 时，程序会乘以 100 并四舍五入（所以现在我有数字 60）。因为 60 大于 25，所以它转到第一个 if 子句。但是，当我想减去用户输入的四分之一数时，它没有给出正确的值。我能做什么？

Answer 1

放弃left，只用cents。

// left = cents-(quarters*25);
cents %= 25;

删除 else 以检查季度和角钱。

// else if (cents >= 10)
if (cents >= 10)

可能还有其他问题。

C 中变量运算的错误结果

Wrong results with variables operations in C

c

boolean-expression

cs50