#include<stdio.h>
int Sum(int n)
{
if(n==1)
return 1;
else
return n+Sum(n-1);
}
int main()
{
int n;
printf(“Please input n:”);
scanf("%d",&n);
if(n>0)
printf(“sum=%d\n”,Sum(n));
else
printf(“date error!\n”);
}
递归法求和
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