Control Statements

C++ for ENSC 151

What is a control statement

• Helps control the program

  • order and such

• Sequence

  • Sequence structure

    • statements execute one after another

• Selection

  • if
  • if else
  • switch

• Iteration

  • while
  • do while
  • for

Selection Structure

• IF Statement

  • used for single selection

    • selects action if condition is TRUE
    • skips if false

• IF else statement

  • used for double selection

    • selects action if true
    • skips to next action if false

• Switch statement

  • used for multiple selection

    • selects one of many actions depending on condition

• Break

  • immediate exit from current statement

• Continue

  • skips the remaining statements in the loop body and goes with the next iteration

Iteration structure

• Loops Statements

  • Performs statements repeatedly while true

• While and for loops

  • if action initially true:

    • perform action zero or more times

  • If condition initially false

    • action is not executed

• Do while:

  • While loop

    • test continuation statement before executing loop body

  • Do while loop

    • tests the loop continuation statement after executing the loops body
    • do statement executes before checking the while condition, continues until while is false