C++ fixed and showpoint

Question

Hello world! Can anyone explain for me the difference between the use of 'fixed' and 'showpoint' in c++ ?
Thanks in advance

Answer 1

They are different things which can not be compared.

The ios::fixed flag allows us to always print floating point numbers (float, double or long double) in fixed notation, i.e. with all its digits.

Eg - cout.setf(ios::fixed); cout<<267.7488494;
>> 267.7488494

Its counterpart is the ios::scientific flag, which prints floating point numbers in standard notation (with a power of 10).

Eg - cout.setf(ios::scientific); cout<<267.4883;
>> 2.674883e+2 //e represents 10, not the euler's number for this case.

The ios::showpoint flag ensures that whenever a floating point number is printed, it is printed with a decimal point, even when it is an integer.

Eg - cout.setf(ios::showpoint); cout<<float(23);
>> 23.0

Its counterpart is the ios::noshowpoint, which simply disables the ios::showpoint flag, if enabled.

Answer 2

Thank you! it is so much clear now.