Chapter 3. Usage of variables in Program
Well, we’ll do a simple program which asks two numbers, add them and then display the results as follows:
Before write the program in computer, we’ll imagine a conversation between two people called John and James.
John: Hey, Tell me a number.
James: 4
John: Tell another number
James: 1
John: The total is 5. Am I correct?
James: Wow.. what a brilliant!
After James says 4, John needs to remember 4 in his memory before continue asking for the second number. And again John needs to remember 1 also somewhere in his memory. To calculate the sum of two numbers, John should add those two numbers which are in his short term memory, add them and give the total.
Now we’ll see how to write the program in computer to do the above.
First the computer will get the first number which inputs by the user and store it in a variable and store the second number in another variable. To calculate the sum, the computer reads the numbers which stores in two different variables, add them and display the result. So the variables are used in a program to store the values temporarily for computation and make the solution accurately.