While loop

When we want to execute some code many times, we can copy-paste those blocks. But that is not very efficient or readable, so we have blocks like the While loop.

A While block has two parts:

• condition - checked each time, before While body is executed
• body - list of blocks executed when the condition is true

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Let's write a program that prints numbers 1 to 5:

• declare an x: Integer = 1
• add a While loop block with condition x <= 5 (the diamond block)
• output x in the While loop body (the true branch)
• assign x = x + 1 in the While loop body

You should see numbers 1,2,3,4,5 printed in the output panel (line by line).

Notice the Assign block: x = x + 1. You can use the previous value of x (before Assign was executed), when calculating its new value.