Question

目前正在研究某些东西，我想我已经知道了95％。

#include <iostream>
using namespace std;

char vehicle, car, truck, bus;
double cost;
int hoursParked;
int main()
{
    cout << "Do you have a car, truck, or bus?" << endl << "c = car, t = truck, 
    b = bus" << endl;
    cin >> vehicle;
    if (cin == c) {
        vehicle = car;
    }
    cout << endl << "How long were you parked?" << endl;
    cin >> hoursParked;

    if (vehicle == car) {
        if (hoursParked <= 2) {
            cost = 1.25 * hoursParked;
        }
        else {
            cost = 1.25 * hoursParked;
            cost = 1.50 * (hoursParked - 2) + cost;
        }
    }

    cout << "Here is your receipt " << 1.25 * cost << endl;


}

这只是开始，我仍然必须添加公共汽车和卡车，但是我遇到的问题是试图弄清楚如何根据输入来分配变量。如果他们输入c，如何将他们的车辆分配给汽车，或者如果他们输入t，如何将其分配为卡车？

Answer 1

我发现您的实施过程中可能需要一些帮助。

首先，您似乎正在将变量名称与字符常量混合在一起：

config.data …

因此，当您以一个字符作为输入时，例如在int var = 'c'; // variable holding the character 'c'中，您想将其与“ c”（汽车），“ b”（公共汽车）等进行比较。

cin >> vehicle;

稍后再次将车辆与汽车char vehicle; cin >> vehicle; if (vehicle == 'c') { //...进行比较，在这里，您将变量名称为vehicle（应为'c'，'b'或't'）的变量与变量car进行比较。内容可以是任何东西（可能为零）。

下面是一个快速重写，为您展示了一种解决此问题的方法的示例，还有很多其他方法，但我希望它可以帮助您入门：

if (vehicle == car) {

Answer 2

#include <iostream>
using namespace std;

int main()
{
    cout << "Do you have a car, truck, or bus?\nc = car, t = truck, b = bus\n";
    char vehicle; // declare your variables where they are used.
    cin >> vehicle; // let the user input a character we can evaluate later

    cout << "\nHow long were you parked?\n";
    int hoursParked;
    cin >> hoursParked;

    double cost;
    switch (vehicle) // evaluate the variable vehicle and switch upon its value
    {
    case 'c': // user input the letter 'c'
        if (hoursParked <= 2) {
            cost = 1.25 * hoursParked;
        }
        else {
            cost = 1.25 * hoursParked;
            cost = 1.50 * (hoursParked - 2) + cost;
        }
        break; // exit the switch. if there were no break execution would continue with case 't'

    case 't':
        // ... add your calculations for a truck
        break;

    case 'b':
        // ... add your calculations for a bus
        break;
    }

    cout << "Here is your receipt " << 1.25 * cost << '\n';
}

如何根据输入分配变量？ C ++

2 个答案: