I can't understand declaring variables

Answer 1

int i,j; <<<this is a declaration. You declare 2 variables to a data type "int" without giving them a value.

i = 20; <<<this is initialization you initialize "i" variable to a value "20".

j=i; <<<this is an assignment you assign variable j to the value of i.

variable "j" and "i" now have a value of 20.

//output of both variables would be 40

hope that helps

Answer 2

Hello Shehab,

When you type: int x = 3; you are pretty much telling the computer the following:

- I want to save some information in the computer memory.
- The information I want to save is an integer (whole number)
- I want to name this integer 'x' so every time I need it I can call its name
- I want the initial value of x to be 3. Note that you can change the value of x any time, that's why we call it a variable (means it changes).

Hope this helps! HAPPY CODING!

Answer 3

a variable is a reference to a value like "he"

instead of saying:

I like Bob. I think Bob is cool. Bob likes blue

we say:

I like Bob. I think he is cool. he likes blue

so we declare a variable once and then refer to it as many times as we need.

in c++ we simply state the type of variable and the name

for example:

string newFriend;

if we want we can also set a value

like so:

string newFriend = "Bob";

or we could set it after as well

like so:

string newFriend;
newFriend = "Bob";