what is const int ctValue=2; int iValue; float fValue; char cValue mean?

Answer 1

ctValue is variable of int type which is constant and we can not modify it in program ex. 45
iValue is variable which is of int type ex.2
fValue is float type variable ex.3.14
cValue is character type variable
,in which we can add only one letter ex.'c'

Answer 2

ctValue, iValue, fValue and cValue are variable names.

An int is a whole number.
A float is a decimal number.
A char is a character.

const stands for constant, and means the variable cannot be modified.