题解 | #阶乘计算#

1. include<bits/stdc++.h> using namespace std; int main(){ int n; cin>>n; for(int i=2;i<=n;i++){ bool prime=true; for(int j=2;j*j<=i;j++){ if(i%j==0){ prime=false; break; } } if(prime) cout<<i<<'链接 '; rn 0; }

#include <iostream>

``` js

int main() { std::cout << "Hello World!"; return 0; }

``` java []
class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello, World!"); 
    }
}

print('Hello world!')

1. ``` js

名称 | 缩写
[链接:-](url)--: | :---:
JavaScript 

``` c++ []
#include <iostream>

int main() {
    std::cout << "Hello World!";
    return 0;
}

class HelloWorld {
  c static void main(String[] args) {
        System.out.println("Hello, World!"); 
    }

print('Hello world!'
      #include<bits/stdc++.h>
using namespace std;
int main()
{
    int sum=1;
    int sum2=0;
    int n;cin>>n;
    for(int i=1;i<=n;i++)
    {
        sum=sum*i;
        sum2=sum2+sum;
    }
    cout<<sum2;
}