#include/*递归*/int _sum(int n) {if(n == 1) return 1;return (n+1)*n/2+_sum(n-1);}int main(){int n,i,j,sum = 0;scanf("%d",&n);/*非递归*/for(i = 1;i void main(){int n=0,sum=0,i=0,j=0;printf("请输入n的值：\n");scanf("%d",&n);for(i=1;i0;j--){sum+=j;}}printf("结果为：%d",&su...
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