Question

1+1/3+(1*2)/(3*5)+(1*2*3)/(3*5*7)+……+(1*2*3*……*n)/(3*5*7*……*(2n+1))的值是多少？谢谢！

C语言程序如图，就是和书上答案不一样，不知道我哪儿错了，求大佬指教。

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Answer 1

#include<stdio.h>

double Pi(double eps) {

double i = 1,rator = 1,nator = 1;

double sum = 1,term = rator/nator;

while(term > eps) {

rator *= i;

nator *=(2*i + 1);

term = rator/nator;

sum += term;

++i;

}

return 2*sum;

}

int main() {

double pi = Pi(1E-6);

printf("%.6lf\n",pi);

return 0;

}

Answer 2

图片太小了，实在看不清。直接给出本题的程序：

#include <stdio.h>

void main(){

double i,k=1,s=0;

for(i=1;k>=1e-6;i++)

{s+=k;k*=i/(i*2+1);}

printf("%f",s*2);

}