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

If you just want to output the value, you can do something like

printf("%.3f", a); // Output value with 3 digits after comma

If you want to convert the value itself, you can do:

a = (int)(a * 1000) / 1000.0f;

Note that both do no rounding, they just truncate the value.