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first checks whether x is less than 5, which it is, so then the {loop body} is entered, where the printf function is run and x is incremented by 1. After completing all the statements in the loop body, the condition, (x < 5), is checked again, and the loop is executed again, this process repeating until the variable x has the value 5.
The while loop below will execute the code in the loop 5 times. x is initialized to 0, and each time in the loop the value of x is incremented. The while loop is set ...
Do while loops check the condition after the block of code is executed. This control structure can be known as a post-test loop. This means the do-while loop is an exit-condition loop. However a while loop will test the condition before the code within the block is executed.
In many programming languages, only integers can be reliably used in a count-controlled loop. Floating-point numbers are represented imprecisely due to hardware constraints, so a loop such as. for X := 0.1 step 0.1 to 1.0 do. might be repeated 9 or 10 times, depending on rounding errors and/or the hardware and/or the compiler version.
If in the 'addition' program above the second loop decrements x 0 instead of incrementing, the program computes the difference (cut off at 0) of the variables and . x 0 := x 1 LOOP x 2 DO x 0 := x 0 ∸ 1 END. Like before we can extend the LOOP syntax with the statement: x 0 := x 1 ∸ x 2
Loops are controlled using the LTx and LBx registers (x either 0 to 1) to set the top and bottom of the loop — that is, the first and last instructions to be executed, which can be the same for a loop with only one instruction — and LCx for the loop count. The loop repeats if LCx is nonzero at the end of the loop, in which case LCx is ...
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If statement S1 takes T time to execute, then the loop takes time n * T to execute sequentially, ignoring time taken by loop constructs. Now, consider a system with p processors where p > n. If n threads run in parallel, the time to execute all n steps is reduced to T. Less simple cases produce inconsistent, i.e. non-serializable outcomes.