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The simple looping statements are:
labelopt while (expressionopt) statement labelopt do statement while (expressionopt) ;In both cases the expression must be of type
int. In the first form, the expression is first tested against 0; while it is not equal to 0, the statement is repeatedly executed. In the second form, the statement is executed, and then, while the expression is not 0, the statement is repeatedly executed. If the expression is missing, it is understood to be non-zero.