只用一个循环: #include <math.h> int main() { int i,n; float sum;
printf("please input numner n:\n"); scanf("%d",&n); for(i=0;i<=n;i++) sum=2*sum+sqrt(i); printf("The sum is %f",sum); getch(); }
[此贴子已经被作者于2005-10-9 0:39:55编辑过]