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A do-while loop is a kind of loopwhich is a kind of control statement.


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This loop will execute the code block once, before checking if the condition is true, then it will repeat the loop as long as the condition is true. The loop will always be executed at least once, even if the condition is false, because the code block is executed before the condition is tested:. Do not forget to increase the variable used in the condition, otherwise the loop will never end!

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A do while loop is a control flow statement that executes a block of code at least once, and then repeatedly executes the block, or not, depending on a given boolean condition at the end of the block.

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Some languages may use a different naming convention for this type of loop. There are two commonly used test after loops in the iteration or repetition category of control structures.

Do while loop

They are: do while and repeat until. This module covers both. The concept of iteration is connected to possibly wanting to repeat an action.

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Like all control structures, we ask a question to control the execution of the loop. The term loop comes from the circular looping motion that occurs when using flowcharting. The basic form of the do while loop is as follows:. In most programming languages the question called a test expression is a Boolean expression.

Java do-while loop

The Boolean data type has two values — true and false. Within the do while control structure there are three attributes of a properly working loop. They are:. This is looping on the true.

Do-while statement (c)

When the test expression is false, you stop the loop and go on with the next item in the program. Notice, because this is a test after loop the action will always happen at least once.

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It is called a test after loop because the test comes after the action. It is also sometimes called a post-test loop, meaning the test is post or Latin for after the action and update.

Dowhile loop in c

The basic form of the repeat until loop is as follows:. Within the repeat until control structure, there are three attributes of a properly working loop. This is looping on the false. When the test expression becomes true, you stop the loop and go on with the next item in the program.

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The three attributes of a test after loop are present. The action part consists of the 6 lines that prompt for data and then displays the total of the two ages. The test is the equality relational comparison of the value in the flag variable to the lower case character of y. This type of loop control is called an event controlled loop.

Do while loop

The flag updating is an event where someone decides if they want the loop to execute again. Using indentation with the alignment of the loop actions and flag update is the normal industry practice. At this point, it is worth mentioning that good programming always provides for a method to ensure that the loop question will eventually be false so that the loop will stop executing and the program continues with the next line of code.

However, if this does not happen, then the program is in an infinite loop.

C while and dowhile loop

Infinite loops are a bad thing. Consider the following code:.

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The programmer ased a value to the flag before the loop and forgot to update the flag. Every time the test expression is asked it will always be true. Thus, an infinite loop because the programmer did not provide a way to exit the loop he forgot to update the flag. No matter what the user replies during the flag update, the test expression does not do a relational comparison but does an asment. Since all non-zero values are treated as representing true, the answer to the text question is true.

C – do while loop in c programming with example

Viola, you have an infinite loop. Understanding Iteration in General — do while The concept of iteration is connected to possibly wanting to repeat an action.

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The basic form of the do while loop is as follows: do some statements or action some statements or action some statements or action update the flag while the answer to the question is true In most programming languages the question called a test expression is a Boolean expression. Understanding Iteration in General — repeat until The concept of iteration is connected to possibly wanting to repeat an action.

The basic form of the repeat until loop is as follows: repeat some statements or action some statements or action some statements or action update the flag until the answer to the question becomes true In most programming languages the question called a test expression is a Boolean expression. An Example Do Output "What is your age?

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Infinite Loops At this point, it is worth mentioning that good programming always provides for a method to ensure that the loop question will eventually be false so that the loop will stop executing and the program continues with the next line of code. Consider the following code: do Output "What is your age?

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Key Terms action item An attribute of iteration control structures. References cnx. : While Loop. Next: Flag Concept. Share This Book Share on Twitter.