Digit limitation from decimal point in C++

Question

I\'m new to C++. I have a double variable double a=0.1239857 and I want to limit variable a from decimal point two digits. So a will b

Answer 1

You can set the precision on a stream, e.g.

double d = 3.14579;
cout.precision(2);
cout << d << endl;

// Or use a manipulator

#include <iomanip>
cout << setprecision(2) << d << endl;

Note that when you send a double or float to a stream like this, it will automatically round for you (which can trip you up sometimes if you aren't aware of this).

Answer 2

What do you mean by you want to limit the variable ? The value or its formatting. For the value, you can use floor + division. Something like:

double a = 0.12123
double b;

b = floor(a * 100) / 100