在杂货店进行更改

Making change at the grocery store

本文关键字：杂货店更新时间：2023-10-16

我是计算机科学的新手，目前正在学习C 。

我们被给予了一个分配，以大量计算变化。例如，我在杂货店的更改是37.37美元。该计划的产出会告诉我我得到的每笔账单中有多少（1二十美元账单，1张十美元账单，1个五美元的账单，2张一美元的账单，一季度，一毛钱和两个便士）。

我已经弄清楚了以前作业的硬币如何做到这一点，但是这些都是全部美元的事实使我撞墙了。

我已经尝试用帐单面额分开，但我无法弄清楚（我在开始时评论了cout/cin语句，因此每次测试程序时，我都不必在数字中输入）：

#include <iostream> 
using namespace std;
int main() {
    double price, change;
    int paymentQ, quarters, dimes, nickels, pennies,
        twentyDollar, fiftyDollar,
        fiveDollar, dollars, tenDollar, totalChange;

    //cout << "What is price? " << endl;
    //cin >> price
    //cout << "Please insert cash or select payment type: " << endl;
    //cin >> paymentQ;
    //change = (paymentQ - price);
    change = 37.37;
    dollars = static_cast<int>(change);
    fiveDollar = 
    tenDollar =
    twentyDollar =
    fiftyDollar = 
    {
        dollars = static_cast<int>(change);
        quarters = (((change - dollars) * 100) / 25);
        dimes = (((change - dollars) * 100) - (quarters * 25)) / 10;
        nickels = (((change - dollars) * 100) - (quarters * 25) - (dimes * 10)) / 5;
        pennies = (((change - dollars) * 100) - (quarters * 25) - (dimes * 10) - (nickels * 5) + .5);
    }
    cout << "nYour change isn " << twentyDollar << " Twenty Dollar bill/s " << endl
        << tenDollar << " Ten Dollar Bill/s" << endl <<
        fiveDollar << " Five Dollar Bill/s" << endl <<
        dollars << " One Dollar Bill/s" << endl <<
        quarters<< " Quarters "<< endl <<
        dimes<< " dimes " << endl <<
        nickels << " Nickels" << endl << 
        pennies << " pennies "<< endl << endl;
    return 0;
}

您分配面额变量的方式都是错误的，甚至可能不应该编译。即使确实如此，它也有很多重复性，而且一般不容易阅读。

尝试更多这样的东西：

#include <iostream> 
using namespace std;
int main() {
    double price, paymentQ, change;
    int quarters, dimes, nickels, pennies,
        fiftyDollars, twentyDollars, tenDollars, fiveDollars, oneDollars;
    //cout << "What is price? " << endl;
    //cin >> price
    //cout << "Please insert cash or select payment type: " << endl;
    //cin >> paymentQ;
    //change = (paymentQ - price);
    change = 37.37;
    // despite what cout shows, 37.37 is actually 37.369999999999997 and
    // so would become 3736 instead of 3737 when multiplied by 100 and
    // truncated as-is to an int, so it needs to be rounded up a little
    // bit to account for that (see https://stackoverflow.com/questions/149033/) ...
    pennies = (change * 100) + 0.1; // see https://ideone.com/wmlzlm for why this work...
    fiftyDollars = pennies / 5000; pennies %= 5000;
    twentyDollars = pennies / 2000; pennies %= 2000;
    tenDollars = pennies / 1000; pennies %= 1000;
    fiveDollars = pennies / 500; pennies %= 500;
    oneDollars = pennies / 100; pennies %= 100;
    quarters = pennies / 25; pennies %= 25;
    dimes = pennies / 10; pennies %= 10;
    nickels = pennies / 5; pennies %= 5;
    cout << "nYour change is " << change << "n"
        << twentyDollars << " Twenty Dollar Bill/sn"
        << tenDollars << " Ten Dollar Bill/sn"
        << fiveDollars << " Five Dollar Bill/sn"
        << oneDollars << " One Dollar Bill/sn"
        << quarters << " Quarter/sn"
        << dimes << " Dime/sn"
        << nickels << " Nickel/sn"
        << pennies << " Penny/sn"
        << endl;
    return 0;
}

输出：

您的更改是37.371二十美元账单/s1个十美元账单/s1五美元账单/s2一美元账单/s1季度/s1毛钱/s0镍/s2便士/s

实时演示

在杂货店进行更改