Java How to Program (early objects), 9/e

2.5 Another Application: Adding Integers

Our next application reads (or inputs) two integers (whole numbers, such as −22, 7, 0 and 1024) typed by a user at the keyboard, computes their sum and displays it. This program must keep track of the numbers supplied by the user for the calculation later in the program. Programs remember numbers and other data in the computer’s memory and access that data through program elements called variables. The program of Fig. 2.7 demonstrates these concepts. In the sample output, we use bold text to identify the user’s input (i.e., 45 and 72).

Fig. 2.7 Addition program that displays the sum of two numbers. ...