无法弄清楚如何在 while 循环内正确递增变量，C [英] Cannot figure out how to properly increment a variable inside of a while loop, C

问题描述

在我的 IDE 中重写我的代码后，今天第 8 次，我犯了菜鸟错误，给我的输入一个错误的数据类型，这个错误已经修复，但我的输出仍然不正确.

After re-writing my code in my IDE, for the 8th time today, I have made rookie mistake of giving my inputs a false data type, that has been fixed but my outputs still are incorrect.

关于我的目标的详细信息:在进行找零时，您很可能希望尽量减少为每位客户分配的硬币数量.好吧，假设收银员欠顾客一些零钱，而在收银员的抽屉里有 25 美分、10 美分、5 美分和 1 美分.要解决的问题是决定向客户提供哪些硬币以及每种硬币的数量.

Details about my goal: When making change, odds are you want to minimize the number of coins you’re dispensing for each customer. Well, suppose that a cashier owes a customer some change and in that cashier’s drawer are quarters (25¢), dimes (10¢), nickels (5¢), and pennies (1¢). The problem to be solved is to decide which coins and how many of each to hand to the customer.

预期结果:
变化欠:0.41
4

实际结果:
变化欠:0.41
3

Expected Result:
Change owed: 0.41
4

Actual result:
Change owed: 0.41
3

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

int main (void)

{
    float dollars;
    int changeowed = 0;

    do
    {
      dollars = get_float ("Change owed: ");
    }
    while (dollars < 0);

    float cents = round(dollars * 100);

    while (cents >= 25)
    {
        cents = cents - 25;
        changeowed++;
    }

    while (cents > 10)
    {
        cents = cents - 10;
        changeowed++;
    }
    while (cents > 5)
    {
        cents = cents - 5;
        changeowed++;
    }

        while (cents > 1)
        {
            cents = cents - 1;
            changeowed++;
        }

        printf("%i 
", changeowed);
}

推荐答案

问题在于:有 4 个循环，一个用于四分之一，一个用于一角硬币，一个用于镍币，一个用于便士.第一个循环条件是正确的:

Here's the problem: There are 4 loops, one for quarters, one for dimes, one for nickels, and one for pennies. The first loop condition is correct:

while (cents >= 25)

其他三个不正确:

while (cents > 10)
while (cents > 5)
while (cents > 1)

这些都需要更改为使用 >= 代替 >.

These all need to be changed to use >= in place of >.

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