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Loop de Loop Going around and around and around

Loop de Loop Going around and around and around. VB12. Sometimes you want to do the same thing over and over. If not too drunk then Get a pint If not too drunk then Get a pint If not too drunk then Get a pint If not too drunk then Get a pint.

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Loop de Loop Going around and around and around

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  1. Loop de LoopGoing around and around and around VB12 VB12

  2. Sometimes you want to do the same thing over and over If not too drunk then Get a pint If not too drunk then Get a pint If not too drunk then Get a pint If not too drunk then Get a pint VB12

  3. Computer programs use loops to do things over and over Do until (drunk) Get a pint Loop VB12

  4. Do … Until … Loop Semantics • The Do Until Loop loops around and around and keeps going until some condition is TRUE Do Until blnTankFull Add Petrol Loop VB12

  5. Do … While … Loop Semantics • The Do While Loop loops around and around and keeps going as long as some condition is TRUE Do While blnHungry Eat Loop VB12

  6. VB uses 3 kinds of loops • Do Until Loop • Do While Loop • For Loop VB12

  7. Do While Loop Do While(Boolean expression) One or more VB statements Loop Boolean expression is evaluated before each iteration and the code is executed if the expression is true VB12

  8. Do Until Loop Do Until(Boolean expression) One or more VB statements Loop Boolean expression is evaluated before each iteration and the code is executed if the expression is false VB12

  9. Often we need a loop to count something each iteration To make 10 cups of coffee Cups = 0 Do until (cups = 10) Make a cup of coffee cups = cups + 1 Loop VB12

  10. For Loops can count VB12

  11. For Loops can count for us To make 10 cups of coffee For cup = 1 to 10 Make a cup of coffee Next cup VB12

  12. For Loop ForintCounter=intStarttointEnd One or more VB statements NextintCounter For loop starts with intCounter set to intStart. After each iteration the value of intCounter is incremented. The iteration when intCounter = intEnd is the last one. VB12

  13. Compound Interest Calculator curPrincipal = 2000 intTime = 5 sngRate = 3.5 For years = 1 to intTime curTotal = curPrincipal * (1 + sngRate / 100) curPrincipal = curTotal Next Years VB12

  14. Loops conditions cant be checked at the bottom • The While and Until loops we looked at check the condition at the top • They can also check at the bottom VB12

  15. Do …Loop Until Do Get a pint Loop Until (Drunk) VB12

  16. Do …Loop While Do Eat Loop While (Hungry) VB12

  17. N! = N*(n-1)*(n-2) … 2 * 1 5! = 1 * 2 * 3 * 4 * 5 lngFactorial = 1 For x = 1 to n lngFactorial = lngFactorial * n Next x Factorial VB12

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