编辑代码

#include <stdio.h>
int sum(int a[],int len);
int main()
{
	int i,len;
	printf("Enter the len:");
	scanf("%d",&len);

	int a[len];
	printf("Enter the number:");
	for(i=0;i<len;i++){
		scanf("%d",&a[i]);
    }
	
	int sumall;	
	sumall=sum(a,len);
	printf("the sum of your number is %d",sumall);
}
int sum(int a[],int len)
{
	if(len==1)
	return a[len-1];
	else{
	int n=len-1	;
	return a[n]+sum(a,len-1);
    }
}