我编写了这个程序，当我运行它并输入20.14时，这是输出：
输入金额：20.14更改到期日：
20美元0季度1角钱0镍币3便士
应该是4便士 . 但它显示3.这是另一个输出：
输入金额：79.58更改到期日：
79美元2个季度0角钱1个镍币3个便士
但出于某种原因，这里计算得恰到好处 .
任何人都可以帮我找到错误吗？提前致谢 .
这是代码：
//Description: This program takes in a dollar amount from the user and
//and calculates and displays how to make the change using the smallest
//number of bills and coins possible.
#include <iostream>
using namespace std;
int main()
{
//Declaring the variables.
//dollarAmount is the amount that will be input by the user, which
//will be split into dollars, quarters, dimes, nickels, pennies.
float dollarAmount;
int dollars = 0, quarters = 0, dimes = 0, nickels = 0, pennies = 0;
//Displaying message to user to input value for dollarAmount.
cout << "Enter the amount: ";
//Taking in the value for dollarAmount.
cin >> dollarAmount;
//Splitting the dollarAmount into dollars, quarters, dimes,
//nickels and pennies.
pennies = dollarAmount * 100.0;
dollars = pennies / 100;
pennies = pennies % 100;
quarters = pennies / 25;
pennies = pennies % 25;
dimes = pennies / 10;
pennies = pennies % 10;
nickels = pennies / 5;
pennies = pennies % 5;
//Displaying a message to the user with desired output
cout << "Change Due:\n\n";
cout << dollars << " dollars\n";
cout << quarters << " quarters\n";
cout << dimes << " dimes\n";
cout << nickels << " nickels\n";
cout << pennies << " pennies\n";
return 0;
}
1 回答
必须使用
<cmath>中包含的std::fmod才能计算浮点除法的浮点余数 .