#include <stdio.h>
main()
{
int i,j,n;
long sum=0,temp=0;
printf(“Please input a number to n:n”);
scanf(“%d”,&n);
if(n<1)
{
printf(“The n must no less than 1!n”);
return;
}
for(i=1;i<=n;i++)
{
temp=0;
for(j=1;j<=i;j++)
temp+=j;
sum+=temp;
}
printf(“The sum of the sequence(%d) is %dn”,n,sum);
getchar();
getchar();
}
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南昌青少年编程