return a number in C++

[pedro2010]

Hello,
Could anybody please help me soon:
In C++, a number x= 367.1234444444444444444. I only want to get x=367.123 or x=367.1234 (some digits after the sign ".") Which function to get it?

Thank you in advance.
Pedro

[Nick Evan]

Perhaps something like this?

[caut_baia]

If you want to display it with only three precision decimals you should use

cout << setprecision(3) << x;

. You should also include the <iomanip> header.

[mrnutty]

Would something like this work for you :

float cut(float num, int maxDigitsAllowedAfterDecimal){
 //error checking if you want
 int wholePart = num;
 if(maxDigitsAllowedAfterDecimal == 0) return wholePart;
 float decimalPart = wholePart - num;
 long factor = pow(10,maxDigitAllowedAfterDecimal);
 return wholePart + float(( long((decimalPart*factor))/factor));
 
}