以下是我写的
#include"stdio.h"
#include"math.h"
int main(void)
{
double a = 1.0, s = 0.0;
int deno = 1, sign = 1;
while(fabs(a) >= 1e-6)
{
a = sign / (double)deno;
s += a;
deno += 3;
sign = -sign;
}
printf("s=%.6f",s);
return 0;
}