Repetition Structure

In Visual Basic the loop structure will allow you to run one or more lines of code repetitively. In the loop structure you have the ability to repeat statements until the condition is true, false, a specified number of times, or once for each element in a collection. In Visual Basic several problems require repetition capability, in which the sequence or calculation of instructions is repeated over and over using different sets of data. Some examples would include continual checking of user data entries until an acceptable entry i.e a valid password is made. With computer programs the power comes from being able to repeat the same calculation or sequence of instructions several times over each time using different data. It uses different data without having to rerun the program for each new set of data values. Visual Basic has three different types of repetition structures, do while structures, for structures, and do/loop until structures. If it is true the code will be executed and if it is false the cold will not be executed. Statements that initially sets the condition is it must always be placed before the condition is first evaluated to ensure the correct loop execution the first time. Statements within the repeating section of code that allows the condition to become false. Using loops one of the things what you will be able to use is the While loop. A While loop does what it sounds like. While the condition(s) are true do the same task. Loops have two parts first a condition that gets tested for true or false value and the second is a statement or set of statements that’s is repeated as long as the condition is true. Do while loops is the expression after the keywords Do While. It’s the condition that is tested to determine if the statements provided before the “Loop Statement” are executed. The Do While loop is evaluated the same as in the If-Else statement. The difference between the two is in how the expression is used. In the Do While Loop the