Value – In computer science, a value is an expression which cannot be evaluated any further (a normal form). The members of a type are the values of that type. For example, the expression 1 + 2 is not a value as it can be reduced to the expression 3 . This expression cannot be reduced any further (and is a member of the type Nat) and therefore is a value.
Variable – In programming, a variable is a value that can change, depending on conditions or on information passed to the program. Typically, a program consists of instructions that tell the computer what to do and data that the program uses when it is running.
Constant – In computer programming, a constant is a value that cannot be altered by the program during normal execution, i.e., the value is constant. … This is contrasted with a variable, which is an identifier with a value that can be changed during normal execution, i.e., the value is variable.
Type – In computer science and computer programming, a data type or simply type is a classification of data which tells the compiler or interpreter how the programmer intends to use the data. Most programming languages support various types of data, for example: real, integer or Boolean.
Print – Most programming languages have the concept of a statement. A statement is a command that the programmer gives to the computer. For example: … This command has a verb (“print”) and other details (what to print).