Question

针对小费计算器程序的一些变量有问题。一些变量使用cin获取其值，而不是在代码本身中声明。如果我尝试输入默认值，程序甚至不会查看输入值。因此，如果我将每个设置为0，则结束时计算的总量将为0.

int main()


int numberofDollars;
int numberofQuarters;
int numberofDimes;
int numberofNickles;
int numberofPennies;

string name;
const float dollar = 1.00;
const float quarter = 0.25;
const float dime = 0.10;
const float nickle = 0.05;
const float penny = 0.01;

float valueofDollars = numberofDollars * dollar;
float valueofQuarters = numberofQuarters * quarter;
float valueofDimes = numberofDimes * dime;
float valueofNickles = numberofNickles * nickle;
float valueofPennies = numberofPennies * penny;

double totalDeposit = valueofDollars + valueofQuarters + valueofDimes + valueofNickles + valueofPennies;

cout << "Enter account owner's name: ";
getline(cin, name);
cout << "Enter number of Dollars: ";
cin >> numberofDollars;
cout << "Enter number of Quarters: ";
cin >> numberofQuarters;
cout << "Enter number of Dimes: ";
cin >> numberofDimes;
cout << "Enter number of Nickles: ";
cin >> numberofNickles;
cout << "Enter number of Pennies: ";
cin >> numberofPennies;

cout << "Account Name: " << name << endl;
cout << "Total Deposit = $" << totalDeposit << endl;






system("pause");
return 0;

Answer 1

您在阅读之前使用变量。你不能声明变量就像你做的那样进行一些计算。您必须在中将值放入变量之后计算值。

当你说
时
float valueofDollars = numberofDollars * dollar;

这意味着“此时计算变量值的乘法并存储它。”它并不意味着“每次变量都会计算出来”。因此，在读取变量后移动所有这些。

Answer 2

您首先计算未初始化值的值，然后读取硬币数量和，在阅读后不再使用它们。

Answer 3

我想这就是你想做的事情：

#include <iostream>

using namespace std;

int main() {

    double  numberofDollars, numberofQuarters,
            numberofDimes, numberofNickles,
            numberofPennies;

    string name;

    const double quarter = 0.25, dime = 0.10,
                nickle = 0.05, penny = 0.01;

    double  valueofDollars, valueofQuarters, valueofDimes,
            valueofNickles, valueofPennies, totalDeposit;

    cout << "Enter account owner's name: ";
    getline(cin, name);
    cout << "Enter number of Dollars: ";
    cin >> numberofDollars;
    cout << "Enter number of Quarters: ";
    cin >> numberofQuarters;
    cout << "Enter number of Dimes: ";
    cin >> numberofDimes;
    cout << "Enter number of Nickles: ";
    cin >> numberofNickles;
    cout << "Enter number of Pennies: ";
    cin >> numberofPennies;

    valueofDollars = numberofDollars;
    valueofQuarters = numberofQuarters * quarter;
    valueofDimes = numberofDimes * dime;
    valueofNickles = numberofNickles * nickle;
    valueofPennies = numberofPennies * penny;

    totalDeposit = valueofDollars + valueofQuarters + valueofDimes + valueofNickles + valueofPennies;

    cout << "Account Name: " << name << endl;
    cout << "Total Deposit = $" << totalDeposit << endl;

    return 0;
}

C4700未初始化的变量，假设使用cin获取它的值

3 个答案: