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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