Announcements

Unit3 deals with the control structures that allow us to program repetition of several statements in a way controllable by the inputs to the program. These structures are also called loops ( while loops, do while loops, for loops etc. ). This material is very basic and important. You will need it and use it continually from this point onward. You must make every effort to learn it well.

Reading Assignments

Mandatory:  Book 1; Pages 109- 131 & 138 - 149 

 Subtopics — Notes/ Examples:

Loops classified by structure type:

• while ( condition ) ….{ statements }
• do .. { statements } …..while ( condition )
• for ( initialization ; condition ; update ) … { statements }

Loops classified by utility:

• Sentinel loops
• Input file failure loops
• Counting loops

 Tasks:

• Write a program which calculates the average of several test scores entered through the keyboard. The sentinel value -1 should terminate the loop. Your program should count the number of the scores entered.
• Write a program which calculates the product of 1*2*3*……..*34. This product is called "factorial of 34" and it is written as 34!
• Start working on HW3 and PA3.

Jacob Y. Kazakia © 2001 All rights reserved