错误“系统”是模糊的？ [英] Error "system" is ambiguous?

问题描述

我有一个简单的程序，它工作正常，但系统（CLS）; 和系统（暂停）; 语句下面有红色IntelliSense行。当我将光标移动到它们上面时，表示错误系统是不明确的。是什么原因导致的？

是我的代码：

  #include< iostream> 
 #include< cmath> 
 using namespace std; 
 
 int main（）
 {
 int choice = 0; 
 const double PI = 3.14159; 
 double sideSquare = 0.0; 
 double radius = 0.0; 
 double base = 0.0; 
 double height = 0.0; 
 
 cout<< 这个程序计算3个不同对象的面积。 << endl; 
 cout<< 1.）正方形< endl; 
 cout<< 2.）Circle< endl; 
 cout<< 3.）右三角形<< endl; 
 cout<< 4.）终止程序< endl<< endl; 
 
 cout<< 请[Enter]你选择的对象：; 
 cin>>选择; 
 system（CLS）; //问题在这里... 
 
 switch（choice）
 {
 case 1：
 cout< 请[Enter]正方形的边长：; 
 cin>> sideSquare; 
 cout<< 区域是：< pow（sideSquare，2）< endl; 
 break; 
 
 case 2：
 cout<< 请[Enter]圆的半径：; 
 cin>>半径; 
 cout<< 区域是：< PI * pow（radius，2）<< endl; 
 break; 
 
 case 3：
 cout<< 请[Enter]三角形的底边：; 
 cin>>基础; 
 cout<< endl<< 现在[Enter]三角形的高度：; 
 cin>>高度; 
 cout<< 区域是：< （基底*高度）/ 2 < endl; 
 break; 
 
默认值：
 cout<< 请下次输入有效的选择。 << endl; 
 return 0; 
} 
 system（pause）; // ... 和这里。 
 return 0; 
} 
  

解决方案

$ c> #include< cstdlib>

资料来源： http://en.cppreference.com/w/cpp/utility/program/system

另外，尽量避免 system ，这很危险。要在程序完成时暂停该程序，请在main的末尾放置一个断点} 。没有标准的方法清除屏幕。

为了将来参考，红色波形是 intellisense 错误，一个不同的前端比实际编译代码，所以红色波浪有时是错误的，特别是对于复杂的模板。在大多数情况下，包括这一个，它是正确的。

I have a simple program, and it works fine, but the system("CLS"); and system("pause"); statements have red IntelliSense lines underneath them. When I move my cursor over them it says Error "system" is ambiguous. What is causing that?

Here is my code:

#include <iostream>
#include <cmath>
using namespace std;

int main()
{
  int choice = 0;
  const double PI = 3.14159;
  double sideSquare = 0.0;
  double radius = 0.0;
  double base = 0.0;
  double height = 0.0;

  cout << "This program calculates areas of 3 different objects." << endl;
  cout << "1.) Square" << endl;
  cout << "2.) Circle" << endl;
  cout << "3.) Right Triangle" << endl;
  cout << "4.) Terminate Program" << endl << endl;

  cout << "Please [Enter] your object of choice: ";
  cin >> choice;
  system("CLS"); // The problem is here...

  switch(choice)
  {
   case 1: 
    cout << "Please [Enter] the length of the side of the square: ";
    cin >> sideSquare;
    cout << "The area is: " << pow(sideSquare, 2) << endl;
    break;

   case 2: 
    cout << "Please [Enter] the radius of the circle: ";
    cin >> radius;
    cout << "The area is: " << PI * pow(radius, 2) << endl;
    break;

    case 3:
    cout << "Please [Enter] the base of the triangle: ";
    cin >> base;
    cout << endl << "Now [Enter] the height of the triangle: ";
    cin >> height;
    cout << "The area is: " << (base * height) / 2 << endl;
    break;

  default:
    cout << "Please [Enter] a valid selection next time." << endl;
    return 0;
  }
  system("pause"); // ... and here.
  return 0;
}

解决方案

You need to #include <cstdlib>

Source: http://en.cppreference.com/w/cpp/utility/program/system

Also, try to avoid system, it's dangerous. To pause the program when it's finished, put a breakpoint on the } at the end of main. There isn't a standard way to clear the screen unfortunately.

For future reference, the red squiggles are intellisense errors, which are shown by a different front-end than the one that actually compiles the code, so the red squiggles are sometimes wrong, especially with complex templates. In most cases, including this one, it's correct though.

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