c++ - 在杂货店做出改变
问题描述
我是计算机科学的新手,目前正在学习 C++。
我们被分配到计算大量变化的任务。例如,我在杂货店的零钱是 37.37 美元。该程序的输出会告诉我每张钞票我能得到多少零钱(1 张 20 美元钞票、1 张 10 美元钞票、1 张 5 美元钞票、2 张 1 美元钞票、四分之一、一角钱和两便士) .
我已经想出了如何用以前任务中的硬币来做这件事,但现在这些都是整美元的事实让我碰壁了。
我试过除以钞票面额,但我无法弄清楚(我在开头注释掉了cout
/cin
语句,所以每次我测试程序时我都不必输入数字):
#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 is\n " << 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;
}
解决方案
您分配面额变量的方式都是错误的,甚至可能不应该编译。即使是这样,它也有很多重复性,而且总体上肯定不容易阅读。
尝试更多类似的东西:
#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/s\n"
<< tenDollars << " Ten Dollar Bill/s\n"
<< fiveDollars << " Five Dollar Bill/s\n"
<< oneDollars << " One Dollar Bill/s\n"
<< quarters << " Quarter/s\n"
<< dimes << " Dime/s\n"
<< nickels << " Nickel/s\n"
<< pennies << " Penny/s\n"
<< endl;
return 0;
}
输出:
你的零钱是 37.37 1 二十美元钞票/秒 1 十美元钞票/秒 1 五美元钞票/秒 2 一美元钞票/秒 1 季度/秒 1 毛钱/秒 0 镍/秒 2 便士/秒
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