Java™ How to Program, Seventh Edition

2.5. Another Java Application: Adding Integers

Our next application reads (or inputs) two integers (whole numbers, like −22, 7, 0 and 1024) typed by a user at the keyboard, computes the sum of the values and displays the result. 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 highlighting to differentiate between the user’s input and the program’s output.

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

1 // Fig. 2.7: Addition.java 2 // Addition program that ...