DEV C++ 输入enter是换行，不能输出

Question

#include <stdio.h>
#include <math.h>
double fact(int n) {
    if (n == 0)
        return 1;
    return fact(n - 1 * n);
}


int main() {

    double x, y = 0, c = 1, b = 1.0;
    int  n = 1, t = 1;
    printf("x的值:");
    scanf("%lf", &x);

    while (b >= pow(10, -6)) {
        c = pow(x, 2 * n - 1) / fact(2 * n - 1);
        y += t * b;
        t = -t;
        n++;
        b = c;
    }

    printf("%if", y);
    printf("%d", n - 1);
    return 0;
}

Answer 1

return fact(n - 1 * n);这是啥意思？n-1 * n不就是0了吗？
是return n * fact(n - 1);吧