Question and Answer
Q How many expressions are there in the if statement?
A The if statement takes only one expression to hold the conditional criteria. When the expression is true (that is, the conditions are met), the statements controlled by the if statement are executed. Otherwise, the next statement following the if statement block is executed.
Q Why is the if-else statement an expansion of the if statement?
A When the conditional expression in the if statement is false, the program control flow is returned back to the original track. However, when the conditional expression in the if-else statement is false, the program control flow branches to the statement block under the else keyword and returns to its original track after the statements controlled by else are executed. In other words, the if statement allows a single statement block to be executed or skipped entirely, whereas the if-else statement executes one of the two statement blocks under the control of the if-else statement.
Q Why do you normally need to add the break statement into the switch statement?
A When one of the cases within the switch statement is selected, the program control will branch to the case and execute all statements within the selected case and the rest of the cases that follow it. Therefore, you might get more results than you expected. To tell the computer to execute only the statements inside a selected case, you can put a break statement at the end of the case so that the program control flow will exit the switch construct after the statements within the case are executed.
Q What can the continue statement do inside a loop?
A When the continue statement inside a loop is executed, the program control is branched back to the beginning of the loop so that another iteration can be started. Inside the loop, any statements following the continue statement will be skipped over each time if the continue statement is executed.
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