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Presentation transcript:

© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved. The while Loop Section 3 Chapter 3 © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved. The while Loop Executes a block of code repeatedly while loop repeatedly executes an indented block of statements As long as a certain condition is met Form Continuation condition is a boolean expression © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved. The while Loop Example 1: Program displays 1 – 5, after loop terminates, num will be 6 © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

The while Loop FIGURE 3.22 Flowchart for Example 1. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved. The while Loop Example 2: Input validation. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved. The while Loop Example 3: Find min, max, average. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved. The while Loop Example 3: Find min, max, average. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved. The while Loop Example 4: Stores the numbers in a list, and then uses list methods and functions to determine the requested values. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved. The while Loop Example 5: Determines when bank deposit reaches one million dollars © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved. The break Statement Causes an exit from anywhere in the body of a loop When break is executed Loop immediately terminates Break statements usually occur in if statements © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved. The break Statement Example 6: Program uses break to avoid two input statements. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

The break Statement FIGURE 3.23 Flowchart for Example 6 © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

The continue Statement When continue executed in a while loop Current iteration of the loop terminates Execution returns to the loop’s header Usually appear inside if statements. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

The continue Statement Example 7: Searches a list for the first int object that is divisible by 11. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved. Creating a Menu Example 8: Uses a menu to obtain facts about the United States. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

The continue Statement Example 8: Uses a menu to obtain facts about the United States. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved. Infinite Loops Example 9: Condition number >= 0 always true. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

Infinite Loops FIGURE 3.24 Program Containing an Infinite Loop. © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.

© 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved. End Section 3 Chapter 3 © 2016 Pearson Education, Inc., Hoboken, NJ. All rights reserved.