Why we use my variable​ command ??

Question

I can also use cout <<" 10";
for 10 out put

Answer 1

you can just cout << "10" but what if instead of 10 you wanted to see the results of 10 times a number which is entered by the user of your program?

Answer 2

I don't know

Answer 3

If a program only has constant numbers, it wouldn't be called a program. It would be more like a document.

Answer 4

You definitely can, and for a simple program like in the example your way might even be better. Variables are really nice if you want them to change later. For example:

int moneyInWallet = 0;

int deposit = 10;

moneyInWallet = moneyInWallet + deposit;

cout << moneyInWallet << endl;

//moneyInWallet is now 10

variables are also really nice for readability. I don't know about you but numbers are to mathy for me. I'de rather my programs read as close to english as possible.

Later edit -> When you're using cout << "10"; you are console logging the ***string*** 10. . . you want to console out the ***integer*** 10.

"10"+"10" = 1010
10 + 10 = 20