Round function ? 3

[rwong]

Is there any function in Visual C++ to round a floating point number? I revised the math.h library and did not find any

 

[dds82]

The way I round numbers is by adding 0.5 and casting it to an integer. That rounds to the nearest whole number. To round to a different decimal precision, first multiply the number by 10^n, round that to the nearest whole number, then divide by 10^n.

 

[TGM]

Hi

Say you wanr nNbr decimals out of the number fNbr, here is another way:

CString str;

str.Format( "%.*f", nNbr, fNbr);

Now you cast str to what you need if required

HTH

Thierry

 

[Elliott3]

dds82,
Thats a good idea. There is the floor() function of <cmath> but I tried it and didn't seem to work right!? Anyhow, adding .5 is a good idea!

CES

 

[2016nc]

#include <cmath>
#include <iostream>

using namespace std;

void main(){
float num = 0;
while (true){//CTRL + C to quit
cin>>num;
cout<<&quot;num rounded down to nearest integer &quot;<<floor(num)<<endl;
cout<<&quot;num rounded up to nearest integer &quot;<<ceil(num)<<endl;
cout<<&quot;num rounded nearest to nearest integer &quot;<<floor(num + 0.5)<<endl;
}

}

 

[2016nc]

Well, besides bad grammer, this will do your rounding.