Loops

Two main types

1. determinate: we know in advance how many times the loop body will execute
2. indeterminate: we do not know in advance how many times the loop body will execute

Two main subtypes

1. pre-test: test first, then execute loop body; minimum number of executions: 0
2. post-test: loop first, then test; minimum number of executions: 1

Questions to aid in selection

1. Do we know how many times the loop body should execute?
   • If yes, use a for loop
2. What is the minimum number of executions of the loop body?
   • if 0, use a while loop
   • if 1, use a do … while loop

Arkin’s GNFRFCPWL

1. write the boolean expression
2. prime the boolean expression
3. write the loop body
4. refresh the boolean expression

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