2楼: Originally posted by realghost828 at 2012-12-11 19:53:12
这个应该是你要的吧：

n = 1;
k = 1;
y = 0;
while 1
    jc = prod();
    yk = y + 1/(k*jc);
    if abs(yk-y)<1e-10
        break;
    else
        k = -k;
        y = yk;
        n = n ...