U3: Loops

• Allow programmer to see patterns in problems and write program accordingly • Limited code repeats infinitely

Loop that doesn’t stop (not good for program)

• Exists in wide variety of languages; works similarly in all • Has built-in variable keeping track of no. of loop executes

• Starts at certain number; ends at certain number • Can be incremented or decremented by given number

• When times loop needed to execute already known • When variable used to indicate no. of loop executes

• Used when programmer doesn’t know no. of times loop needs to repeat • while; do while

Used for executing loop +0 times

Used for executing loop +1 times

• System.out.print prints in single line repeatedly • System.out.println prints in different lines repeatedly

Can change no. of times loop executes; exit program

• Specific way to organize large amounts of same type of data • Can store, process and output data • Arrays, stacks, queues, linked lists

Loops inside of loops