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C++：输入四个整数，按从小到大的顺序输出
2023-07-05 00:49:54 深夜i     15     0
C++ 输入 四个整数 从小到大 输出

C++编程是一种非常有趣的活动，它可以通过解决各种问题来增强我们的计算机技能和知识。在本文中，我们将看到如何使用C++编程输入四个整数，并按从小到大的顺序输出它们。

首先，我们使用C++的标准输入/输出库来获取四个整数。我们使用cin从用户输入读取四个整数，并使用cout将它们输出到屏幕上。例如：

int a, b, c, d;
cin >> a >> b >> c >> d;
cout << "You have entered: " << a << " " << b << " " << c << " " << d << endl;

接下来，我们将使用if语句来比较这四个整数，并按从小到大的顺序输出它们。我们使用if-else if语句来针对不同的情况进行操作。例如：

if (a <= b && a <= c && a <= d) {
  cout << a << " ";
  if (b <= c && b <= d) {
    cout << b << " ";
    if (c <= d)
      cout << c << " " << d << endl;
     else
      cout << d << " " << c << endl;
    
  } else if (c <= b && c <= d) {
    cout << c << " ";
    if (b <= d)
      cout << b << " " << d << endl;
     else
      cout << d << " " << b << endl;
    
  } else {
    cout << d << " ";
    if (b <= c)
      cout << b << " " << c << endl;
     else
      cout << c << " " << b << endl;
    
  }
} else if (b <= a && b <= c && b <= d)
  // Repeat the process for b as the smallest number.
else if (c <= a && c <= b && c <= d)
  // Repeat the process for c as the smallest number.
else
  // Repeat the process for d as the smallest number.

上面的代码使用嵌套if语句来比较四个数字，并确定它们之间的大小关系。它还使用cout来按从小到大的顺序输出这四个数字。

最后，我们可以将上述代码全部放在一起，并使用C++编译器进行编译和运行。以下是完整的程序：

#include <iostream>
using namespace std;
int main() {
  int a, b, c, d;
  cout << "Enter four integers: ";
  cin >> a >> b >> c >> d;
  cout << "You have entered: " << a << " " << b << " " << c << " " << d << endl;
  if (a <= b && a <= c && a <= d) {
    cout << a << " ";
    if (b <= c && b <= d) {
      cout << b << " ";
      if (c <= d)
        cout << c << " " << d << endl;
       else
        cout << d << " " << c << endl;
      
    } else if (c <= b && c <= d) {
      cout << c << " ";
      if (b <= d)
        cout << b << " " << d << endl;
       else
        cout << d << " " << b << endl;
      
    } else {
      cout << d << " ";
      if (b <= c)
        cout << b << " " << c << endl;
       else
        cout << c << " " << b << endl;
      
    }
  } else if (b <= a && b <= c && b <= d)
    cout << b << " ";
    // Repeat the process for b as the smallest number.
   else if (c <= a && c <= b && c <= d)
    cout << c << " ";
    // Repeat the process for c as the smallest number.
   else
    cout << d << " ";
    // Repeat the process for d as the smallest number.
  
  return 0;
}

在编译和运行这个程序之后，我们可以通过输入四个整数来测试它，并按从小到大的顺序输出它们。这是一个很好的练习，可以让我们更深入地了解C++编程语言，并提高我们的计算机技能。

  
  

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