Algorithm Analysis

Let's find the product and sum of the digits of the number $n$. We will output the ratio of the product of the digits of the number to their sum.

Algorithm Implementation

Read the input number $n$.

scanf("%d", &n);

We find the product of the digits of the number $n$ in the variable res. We find the sum of the digits of the number $n$ in the variable s. We initialize the variables.

res = 1; s = 0;

We iterate through the digits of the number. We divide the number $n$ by 10 until we get 0.

while (n > 0)
{
    s += n % 10;
    res = res * (n % 10);
    n /= 10;
}

We divide the product of the digits res by their sum s.

res /= s;

We output the answer.

printf("%.3lf\n", res);