c語言（計算機2級上機題目）

Input eps : 0.0005

eps = 0.000500, PI/2 = 1.570553

Press any key to continue

*/

#include <stdio.h>

#include <math.h>

double fun(double eps) {

double m = 1.0,n = 1.0,t = 1.0,sum = 1.0;

int i;

for(i = 1;t >= eps; ++i) {

m *= i;

n *= 2 * i + 1;

t = m/n;

sum += t;

}

return sum;

}

int main() {

double x;

// void NONO();

printf("Input eps : ");

scanf("%lf",&x);

printf("\neps = %lf, PI/2 = %lf\n", x, fun(x));

// NONO();

return 0;

}