round (4.47) is wrong

[Observer]

Hi,

I want to use round(4.47) - http://www.cplusplus.com/reference/cmath/round/

I expect to see this:

round(4.47) = 5

But I see:

round(4.47) = 4

#include <iostream>
#include <cmath>
#include <cstdlib>
using namespace std;

int main(int argc, char** argv) {
    int x = round(4.47);
    cout << "round(4.47) = " << x << endl;
    return 0;
}

[Observer]

Is it right in math?

4.45 ~ 4.5 ~ 5

[maeriden]

4.47 is closer to 4 than it is to 5, so round() returns 4. The function ceil() does what you expect this to do.

[Observer]

Thank you very much.