W3School TIY Editor

#include <iostream>

using namespace std;

​

int main() {

  // 声明整型变量

  int length = 4;

  int width = 6;

​

  // 计算矩形面积

  int area = length * width;

​

  // 输出变量值

  cout << "长度为: " << length << "\n";

  cout << "宽度为: " << width << "\n";

  cout << "矩形面积为: " << area << "\n";

​

  return 0;

}