C + + ouput exactly 2 Digits after decimal point three digits left

In C + + programming, sometimes ask us to keep the data after the decimal point, or how many digits to retain the number of valid numbers and so on, then we need to use the setiosflags and setprecision functions, remember to include the header file #include <iomanip> Please refer to the following example:

#include <iostream>#include<iomanip>//need thisusing namespacestd;intMain () {floatA =4, B =3, C =2; cout<< A/b <<Endl; cout<< b/c <<Endl; cout<< Setprecision (3) << A/b <<Endl; cout<< Setprecision (3) << b/c <<Endl; cout<< Setiosflags (iOS::fixed) << Setprecision (3) << A/b <<Endl; cout<< Setiosflags (iOS::fixed) << Setprecision (3) << b/c <<Endl; return 0;}

The output is:

1.33333 1.5 1.33 1.5 1.333 1.500

As shown above, the default is to retain a maximum of 6 valid digits, if we add setprecision (3), we need three digits, if we want three digits after the decimal point, we need to add setiosflags (ios::fixed) in front.

C + + ouput exactly 2 Digits three-bit digits after the decimal point to be retained