Question

VC环境下，用C语言编程输出s=1+(1+2)+(1+2+3)...+(1+2+3+4+...+n)

Answer 1

#include <stdio.h>
void main()
{
int f(int n);
int n;
int i;
int sum = 0;
scanf("%d",&n);
for(i=1;i<=n;i++)
{
sum = sum + f(i);
}

printf("%d",sum);
}
int f(int n)
{
int sum = 0;
int a;
if(n==1)
return 1;
else

return f(n-1) + n;

}

Answer 2

C++做法：
#include <iostream>
using namespace std;
void main()
{
int sum = 0;
int temp = 0;
int n = 0;
cout<<"请输入n：";
cin>>n;
for( int i = 1;i <= n;i++)
{
for(int j = 1;j <= i;j++)
temp += j;
sum += temp;
temp = 0;
}
cout<<"1+(1+2)+(1+2+3)...+(1+2+3+4+...+n)的值是："<<sum<<endl;
}