C++是一种跨平台的编程语言，在许多领域都有广泛的应用。这里为大家整理了一些C++的简单代码，供入门学习或实际使用。

1. 输出Hello World!

#include <iostream>
int main()
  std::cout << "Hello World!" << std::endl;
  return 0;

2. 输入和输出

#include <iostream>
int main()
  int x;
  std::cout << "Please enter an integer: ";
  std::cin >> x;
  std::cout << "The number you entered is " << x << std::endl;
  return 0;

3. 求两个数的和

#include <iostream>
int main()
{
  int a, b, sum;
  std::cout << "Please enter two integers: ";
  std::cin >> a >> b;
  sum = a + b;
  std::cout << "The sum of " << a << " and " << b << " is " << sum << std::endl;
  return 0;
}

4. 判断一个数是否为偶数

#include <iostream>
int main()
{
  int x;
  std::cout << "Please enter an integer: ";
  std::cin >> x;
  if (x % 2 == 0)
    std::cout << x << " is even" << std::endl;
  
  else
    std::cout << x << " is odd" << std::endl;
  
  return 0;
}

5. 判断一个年份是否为闰年

#include <iostream>
int main()
{
  int year;
  std::cout << "Please enter a year: ";
  std::cin >> year;
  if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
    std::cout << year << " is a leap year" << std::endl;
  
  else
    std::cout << year << " is not a leap year" << std::endl;
  
  return 0;
}

6. 计算n的阶乘

#include <iostream>
int main()
{
  int n, factorial = 1;
  std::cout << "Please enter an integer: ";
  std::cin >> n;
  for (int i = 1; i <= n; i++) {
    factorial *= i;
  }
  std::cout << n << "! = " << factorial << std::endl;
  return 0;
}

7. 计算斐波那契数列的第n项

#include <iostream>
int main()
{
  int n;
  std::cout << "Please enter an integer: ";
  std::cin >> n;
  int a = 0, b = 1, c;
  for (int i = 2; i <= n; i++) {
    c = a + b;
    a = b;
    b = c;
  }
  std::cout << "The " << n << "th Fibonacci number is " << b << std::endl;
  return 0;
}

以上代码只是C++语言的冰山一角，学习C++需要不断积累，不断实践，才能够掌握这门语言。希望大家加油！

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