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 
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).