Difference Between While and Do While Loop

Both of these loops are types of statements used in these languages, but there is a fundamental difference between while and do-while loop in C, C++, Java. In this article, we will discuss the same in a tabular form. But let us first know a bit more about each of these.

What is a while loop?

Here, the while loop refers to a control flow statement that basically lets the execution of a code on the basis of any given Boolean condition. Therefore, we can think of a while loop as a type of a repeating it statement.

What is a do-while loop?

The do-while loop is very similar to that of the while loop. But the only difference is that this loop checks for the conditions available after we check a statement. Thus, it is an example of a type of Exit Control Loop.

Difference Between while and do-while loop in C, C++, Java

Here is a list of the differences present between while and do-while loop in C, C++, Java.

Parameters while do-while
Checking of Condition It first needs to check the condition, and only then can we execute the statement(s). The execution of statement(s) occurs at least once. After that, the checking of the condition occurs.
Semicolon while(condition)

No semicolon is present at the end of the while loop.

while(condition);

A semicolon is present at the end of the do-while loop.

Requirement of Brackets We don’t require any brackets if there is only a single statement. We would always require brackets in this case.
Initialization of Variables We always need to initialize a variable in a condition before the execution of this loop. The initialization of the variable may occur within or before the execution of the loop.
Controlling The while loop is an entry-controlled type of loop. The do-while loop is an exit-controlled type of loop.

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