do loop fortran

In Fortran, the do loop is used for iterative execution of a block of code. It allows you to repeat a set of statements a specified number of times or until a certain condition is met.

The basic syntax of the do loop in Fortran is as follows:

do index_variable = start, end, increment
    ! statements to be executed
end do

Here's a breakdown of each part of the do loop syntax:

• index_variable: This is the loop index variable that is used to control the iteration of the loop. It is usually an integer variable.
• start: This is the starting value for the loop index variable.
• end: This is the ending value for the loop index variable.
• increment: This is the value by which the loop index variable is incremented or decremented after each iteration of the loop.

Within the loop, you can include any desired statements that need to be executed repeatedly. The loop index variable can be used to control the flow of the loop and perform different actions based on its value.

It's important to note that the loop index variable is automatically incremented or decremented by the increment value after each iteration. The loop will continue until the loop index variable reaches the end value.

Here's an example of a do loop in Fortran:

program do_loop_example
    implicit none
    integer :: i

    do i = 1, 10, 1
        print *, "Iteration:", i
    end do

end program do_loop_example

In this example, the loop will iterate from i = 1 to i = 10 with an increment of 1. The print statement inside the loop will display the current iteration number.

This is a basic overview of the do loop in Fortran. It provides a way to repeat a block of code for a specified number of iterations or until a certain condition is met.