Question

C++ programming homework

What does it mean to declare a variable? Give an example.

What does it mean to assign a value to a variable? Give an example.

What is the different between assigning and initializing? Give examples.

Answer 1

1) Variable declaration
In c++ it is necessary to declare a varibale before using it.
When we declare variable it reserves memory for varible to store value.

Syntax
datatype variablename;

Example
int number;

In this example we created a variable of 'int' datatype
and name of that variable is 'number'.

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2) Assignment of variable
After declaring variable we can assign the value to that variable.
In the process of variable assignment we store a value in that variable
but in different statement than declaration statement.

Syntax
variablename = value;

Example
number = 100;

In this example we stored 100 into variable 'number'.

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3) Initialization of variable
Initialization of variable means we assign value to the variable
at the time of variable declaration itself.

Syntax
datatype variablename = value;

Example
int number = 100;

In this example we declared a 'int' type variable 'number'
and also assigned 100 to it.