Week6Chap4-Iv - Chapter 4 Control Statements in Java...

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Janaka Balasooriya CSE 110, Arizona State University Chapter 4 Control Statements in Java Repetition
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What is Repetition A simple example: Suppose you are to write a program that read 10 numbers from the key board and add them together. Approach1: int number; int sum =0; // read the first number number = scan.nextInt(); sum = sum + number // sum +=number; // read the second number number = scan.nextInt(); sum = sum + number // sum +=number; …… continue until we add all ten numbers Janaka Balasooriya CSE 110, Arizona State University Properties of this computation Repeat the same set of statements several time (10 times in this case) Towards a General Approach •Initial state (read the first number) • Upper limit : read the 10th number • Perform the same set of operations starting from the initial state until we reach the upper limit
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A Generic Syntax for the Repetition Janaka Balasooriya CSE 110, Arizona State University Perform following set of operations for 10 times number = scan.nextInt(); sum = sum + number // sum +=number; Strategy: • We need to keep a counter that indicated how many times that we execute this set. initially counter is set to 0 each time when we execute the above set of statement we increment the counter by 1 counter = 0; number = scan.nextInt();
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