I'm new in C++.I have double variable
double a=0.1239857 I want to limit variable
from decimal point two digits.So
a will be
0.12. I know C++ have functions that return largest or smallest integer that is greater or lower than
a like ceil or floor.Is there a function that implement digit limitation of floating-point variable? Or How can i change precision of
Are you actually trying to round the number, or just change its displayed precision?
For the former (truncating the extra digits):
double scale = 0.01; // i.e. round to nearest one-hundreth value = (int)(value / scale) * scale;
or (rounding up/down as appropriate, per jheriko's answer)
double scale = 0.01; // i.e. round to nearest one-hundreth value = floor(value / scale + 0.5) * scale;
For the latter:
cout << setprecision(2) << value;
where the parameter to
setprecision() is the maximum number of digits to show after the decimal point.