Variables

Variables are used to store data in programming languages. You might remember from your algebra class that, The number of chocolates is x, where we didn't know the value of x, but after the math was done, we found the value of x. Let's make it clear by giving an example. Consider a scenario: A boy has 23 pencils; he buys 13 pencils. How many pencils does he have now?

It's simple. Just sum up all the numbers. But let's try to do it using a variable. We can solve it as follows:

The number of pencils the boy has now is x:

So, x = 23+13 Or, x = 46

We have found the value of x, which is the total number of pencils the boy has now.

Have you noticed we stored the number of pencils on the variable x? Yes, this is what we do with variables.

In C programming, we often need to declare variables inside our code. During the C program execution, an entity that may vary is called a variable. There are a few rules for declaring a variable name. We cannot name our variables...