#include <iostream>
#include <cmath>

void rSqrt(void)
{
    unsigned long int n = 0;
    if (scanf("%lu", &n) != -1)
    ¦  rSqrt();
    else
    ¦   return;
    printf("%.4f\n", sqrt(n));
    return;
}

int main()
{
    rSqrt();
    return 0;
}

C and C++ programs are compiled on the server with the 32-bit Microsoft Visual C++ 2017 or MinGW GCC 7.1 or Clang 4.0.1.

So, sizeof(unsigned long)==4.

Edited by author 23.10.2018 19:03