The syntax of the three loops - For, while, and do while – mainly differs in the order in which these three statements are placed. Syntax of While LoopĪs previously stated, a loop is made up of three statements: an initialization expression, a test expression, and an update expression. The while is also a reserved word to denote the basic control flow structure. If the expression or condition is true the block of codes inside it will get executed else in other cases will not execute. The while loop takes a logical expression and executes the loop based on the validation of the logical expression. In C++ programing language, the while loop is another major looping construct. The execution of the loop is terminated based on the test conditions. While loops are used when we don't know the exact number of loop iterations ahead of time. This guarantees that the loop is executed at least once before terminating. When studying the for loop, we discovered that the number of iterations is known in advance, i.e., how many times the body of the loop must be executed is known to us. The do-while loop is very similar to the while loop except that the condition is checked at the end of the loop body. In the previous tutorials, we learned about the basic concept of the loop in C++ and For Loop in detail.
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