RoundTo

[Wojtek]

Hello
What am i supposed to do to be able to use RoundTo function?

Thanx

[Rolf Magnus]

Wojtek wrote:

Hello
What am i supposed to do to be able to use RoundTo function?

There is no such thing as a function "RoundTo" in standard C++. You
should ask in a newsgroup about your compiler.

[marbac]

Wojtek wrote:

Hello
What am i supposed to do to be able to use RoundTo function?

Thanx

Maybe there is a more efficient method, but here is the code i use:
#include<iostream>
#include <cmath>

using std::cout;
using std::endl;
using std::pow;
double round(double number, int digits){
int mul = (int)pow((double)10,(double)digits);
number*=mul;
if(number>0)
number+=0.5;
else
number-=0.5;
number=static_cast<int>(number);
number/=mul;
return number;
}

main () {
double a=4.34678,b;
b=round(a,3);
cout << a << ";"<<b<< endl;
a=-542.6715;
b=round(a,3);
cout << a << ";"<<b<< endl;
}

regards marbac

[marbac]

Wojtek wrote:

Hello
What am i supposed to do to be able to use RoundTo function?

Thanx

Maybe there is a more efficient method, but here is the code i use:

#include<iostream>
#include <cmath>
using std::cout;
using std::endl;
using std::pow;
double round(double number, int digits){
int mul = (int)pow((double)10,(double)digits);
number*=mul;
if(number>0)
number+=0.5;
else
number-=0.5;
number=(int)number;
number/=mul;
return number;
}

main () {
double a=4.34678,b;
b=round(a,3);
cout << a << ";"<<b<< endl;
a=-542.6715;
b=round(a,3);
cout << a << ";"<<b<< endl;
}

regards marbac