Pascal - Loops
There may be a situation, when you need to execute a block of code several number of times. In general, statements are executed sequentially: The first statement in a function is executed first, followed by the second, and so on.
Programming languages provide various control structures that allow for more complicated execution paths.
A loop statement allows us to execute a statement or group of statements multiple times and following is the general form of a loop statement in most of the programming languages:
Pascal programming language provides the following types of loop constructs to handle looping requirements. Click the following links to check their details.
|while-do loop||Repeats a statement or group of statements while a given condition is true. It tests the condition before executing the loop body.|
|for-do loop||Executes a sequence of statements multiple times and abbreviates the code that manages the loop variable.|
|repeat-until loop||Like a while statement, except that it tests the condition at the end of the loop body.|
|nested loops||You can use one or more loop inside any another while, for or repeat until loop.|
Loop Control Statements:
Loop control statements change execution from its normal sequence. When execution leaves a scope, all automatic objects that were created in that scope are destroyed.
Pascal supports the following control statements. Click the following links to check their details.
|break statement||Terminates the loop or case statement and transfers execution to the statement immediately following the loop or case statement.|
|continue statement||Causes the loop to skip the remainder of its body and immediately retest its condition prior to reiterating.|
|goto statement||Transfers control to the labeled statement. Though it is not advised to use goto statement in your program.|