Computers

Difference between while and do-while Loop




  • Main Difference

    While loop has its usage when it comes to executing the same statements for a longer number of times without any restriction. On the other hand, the do-while loop has its usage when it comes to executing the same statements for specific purposes and the longer number of times.

    Comparison Chart

    Basis of Distinction While Do While
    Definition The loop which continues until the statement holds true and repeats constantly. The loop which holds true for specific instructions.
    Statement Only one statement for all the package to work Requires separate statement for all the while conditions.
    Expression While (condition) {statement;}. Do {statements;} while (condition);
    Execution System crashes due to rapid and continuous repetitions. Only executes the statement for the particular time interval of the actual value.
    Nature Takes less time to execute but and the code is shorter. Takes more time to execute and code becomes longer.

    While Loop

    It keeps on repeating itself as long as one statement stays true and does not depend on any other condition. The sentence structure of a while circle in C++ is: while(condition) {statement; } Here, the statement might be a single explanation or a several lines of code. The condition might be any expression, but does not work if the loop is of zero value. For all the cases, it has to stay positive and greater than one. The while loop is utilized to rewrite a segment of code required many times until a condition is met. For instance, say we need to know how frequently we can separate a given number which is not equal to 1. We keep on adding the number and the loop keeps on working until the number is 1 and it displays while ending the loop. It tests the condition before executing the circle body. You can utilize at least one circle inside another while, for, or do-while statement. This action repeats until the phrase turns out to be false. Otherwise, the whole process keeps on repeating. For some cases, it may crash the system since the value never becomes false and therefore system keeps working quickly.

    Do-While Loop

    It holds true if the initial condition keeps becoming right, and then stops the execution if something does not fall within the statement. It has more control with the user as they may define different loops which may become true if the condition holds for them. To express the statement, the following interface becomes useful. Do {statements;} while (condition ); If the status is valid, the program moves towards the do statement, and the statement(s) inside the program execute once more. The do/while loop is a variation of the while loop. This process will run through the code, before checking if the condition is valid, then it will resurface if the state is correct. The do-while is like the while, except from that the test condition happens toward the end of the loop. Having the test condition toward the end ensures that the coding does not crash the program and in this way, remains constant at all circumstances. Initially, the code inside the square is executed, and after that, the state assessed. If the condition is genuine, the code inside the bracket is executed once more. If the condition is false, it terminates the program.

    Key Differences

    • While loop requires only one case for all the package to work, whereas do-while loop requires separate reports for all the while conditions.
    • When the statement holds true for while loop, the system crashes due to rapid and continuous repetitions. On the other hand, do while loop only executes the statement for the particular time interval of the actual value.
    • The system halts before the programming enters the body of the while loop when it knows the statement does not hold true. On the other hand, the system halts after the reader enter the body and see that the condition does not hold true.
    • While loop takes less time than the do-while loop to complete the cycle.
    • The sentence structure of a while circle in C++ is: while (condition) {statement;}. Whereas the sentence structure for the do-while loop becomes Do {statements;} while (condition);
    • The coding for a while loop is less than the code for a do-while loop.

    Video Explanation