The char has lesser bytes than int and int has lesser bytes than double whereas int and float 

can potentially have same sizes. 

0.5f results in 0.5 to be stored in floating point representations.
Output:
$ g++ float.cpp
$ a.out
equal

None.

The value 123 is printed because of its precision.
$ g++ float.cpp
$ a.out
123

The double had to truncate the approximation due to it’s limited memory, which resulted in a number 

that is not exactly 0.1.
Output:
$ g++ float2.out
$ a.out
0.10000000000000001

To make a floating point literal, we should attach a suffix of ‘f’ or ‘F’ and there should not be any 

blank space.

None.

Float store floating point numbers with 8 place accuracy and requires 4 bytes of Memory. Double 

has 16 place accuracy having size of 8 bytes.
Output:
$ g++ float3.cpp
$ a.out
harvard

Floating point types occur in only three sizes-float, long double and double.

Float for single precision, double for double precision and long double for extended precision.