c++ - 在 C++ 的 if 语句中比较两个 boolean 值的建议

Question

我写的一些代码有问题。

我正在用 C++ 编写，我正在尝试设置 3 个字符串，所有字符串都处于“关闭”状态。我还试图在程序开始时将 2 个 boolean 值设置为 false。所有这些开始代码都有效。

我想设置一个 if 语句，这样如果 boolean 值同时为 true，那么所有的字符串都将变为“on”，然后程序将打印一个输出说他们在。

我在网上看过，但找不到答案，所以如果您有任何想法，我将不胜感激。

谢谢!

引用代码如下:

//imports the required utilities for the program
#include <iostream>
#include <string>
using namespace std;
//sets up the main method 
    int main()
    {
//declares and assigns all variables needed for program
        string light1 = "off";
        string light2 = "off";
        string electricity = "off";
        bool power(false);
        bool pressure(true);
//prints the outcome to indicate that the electricity is off to begin with
        std::cout << ("The Electricity is " + electricity +", Light #1 is "+ 
light1 +" and Light #2 is "+ light2 +".");
//introduces if statement to turn on electricity in lights
        if ((power) && (pressure))
        {
            string light1 = "on";
            string light2 = "on";
            string electricity = "on"; 
        }
//prints the new outcome to indicate if the electricity is on
        cout << "\n";
        std::cout << ("The Electricity is " + electricity +", Light #1 is "+ 
light1 +" and Light #2 is "+ light2 +"."); 
     }

Answer 1

您正在声明三个新的字符串变量，它们只存在于该 if 语句的范围内。删除数据类型以将值分配给 if 语句之外的字符串，如下所示

if ((power) && (pressure))
{
    light1 = "on";
    light2 = "on";
    electricity = "on";
}