Fortran - Loops

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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 −

Fortran provides the following types of loop constructs to handle looping requirements. Click the following links to check their detail.

Sr.No	Loop Type & Description
1	do loop This construct enables a statement, or a series of statements, to be carried out iteratively, while a given condition is true.
2	do while loop Repeats a statement or group of statements while a given condition is true. It tests the condition before executing the loop body.
3	nested loops You can use one or more loop construct inside any other loop construct.

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.

Fortran supports the following control statements. Click the following links to check their detail.

Sr.No	Control Statement & Description
1	exit If the exit statement is executed, the loop is exited, and the execution of the program continues at the first executable statement after the end do statement.
2	cycle If a cycle statement is executed, the program continues at the start of the next iteration.
3	stop If you wish execution of your program to stop, you can insert a stop statement