CS 240 – Computer Programming I Lab

1. CS 240 – Computer Programming ILab KalpaGunaratna – kalpa@knoesis.org http://knoesis.wright.edu/researchers/kalpa/

2. Contact • Contact by e-mail • kalpa@knoesis.org • Office hours • 376 Joshi • Mondays & Wednesday 3:00 pm – 4:00 pm

3. Intention • Familiar yourself with various loops available in Java language. • Some loops have advantages above others but all loops can be used most of the time for many tasks. • Loops, • for , while, do while • Any loop can be nested in whatever you want and for your requirement.

4. while loop • while (<boolean condition>) { // loop body } Until the boolean condition is false Loop will iterate. First checks the condition and execute The body. <boolean condition> false true <loop body>

5. do – while loop • do { // loop body } while (<boolean condition>) • Loops body is executed at least before checking the condition. <loop body> <boolean condition> true false

6. for loop • Steps, initial action (only once) -> check condition -> body -> final action -> loop <initial action> <boolean condition> false true <loop body> <action>

7. Following two for loops and while loop are equivalent. for( ; ; ){ // do something } for( ; true; ) { // do something } while( true ){ // do something }

8. In lab • Remember the last week’s lab about printing a triangle. • Numbers you have to print is all about powers of 2. • Math.pow(2, <power>); • Numbers should be exactly as they are shown in the assignment and also they should align in the exact way !

9. Post lab • Repeat the same process as you did in in lab and use whole and do – while loops. No for loops ! • You should use at least one of while and do – while loops.