Question 21What is the difference between a while and do-while loop ?

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while loopdo-while loopwhile is an entry-controlled loop.do-while is an exit-controlled loop.while loop checks the test condition at the beginning of the loop.do-while loop checks the test condition at the end of the loop.while loop executes only if the test condition is true.do-while loop executes at least once, even if the test condition is false.while loop is helpful in situations where number of iterations is not known.do-while loop is suitable when we need to display a menu to the user.Syntax:while(test condition){...}Syntax:do{...}while(condition);

while loop	do-while loop
while is an entry-controlled loop.	do-while is an exit-controlled loop.
while loop checks the test condition at the beginning of the loop.	do-while loop checks the test condition at the end of the loop.
while loop executes only if the test condition is true.	do-while loop executes at least once, even if the test condition is false.
while loop is helpful in situations where number of iterations is not known.	do-while loop is suitable when we need to display a menu to the user.
Syntax: while(test condition) { ... }	Syntax: do { ... }while(condition);

Revising Basic Java Concepts — Question 40

Question 21