C语言 输入n,输出1-1/2+1/3.+(-1)(n-1次方)*1/n的值 示例 输入:10 输出:0.645635!#includeint fun(int n);int main(void){int n;double ff;scanf("%d",&n);ff=fun(n);printf("%.6f",ff);return 0;}int fun(int n){int i;double temp=2,item=1.0,sum
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