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Note that you never absolutely need a break or continue statement The programs in Displays 28 and 29 can be rewritten so that neither uses either a break or continue statement The continue statement can be particularly tricky and can make your code hard to read It may be best to avoid the continue statement completely or at least use it only on rare occasions
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s NESTED LOOPS
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It is perfectly legal to nest one loop statement inside another loop statement When doing so, remember that any break or continue statement applies to the innermost loop (or switch) statement containing the break or continue statement It is best to avoid nested loops by placing the inner loop inside a function de nition and placing a function invocation inside the outer loop Functions are introduced in 3
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Self-Test Exercises
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36 What does a break statement do Where is it legal to put a break statement 37 Predict the output of the following nested loops:
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int n, m; for (n = 1; n <= 10; n++) for (m = 10; m >= 1; m--) cout << n << " times " << m << " = " << n*m << endl;
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Boolean expressions are evaluated similar to the way arithmetic expressions are evaluated The C++ branching statements are the if-else statement and the switch statement A switch statement is a multiway branching statement You can also form multiway branching statements by nesting if-else statements to form a multiway if-else statement A switch statement is a good way to implement a menu for the user of your program The C++ loop statements are the while, do-while, and for statements A do-while statement always iterates their loop body at least one time Both a while statement and a for statement might iterate their loop body zero times A for loop can be used to obtain the equivalent of the instruction repeat the loop body n times
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Flow of Control
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A loop can be ended early with a break statement A single iteration of a loop body may be ended early with a continue statement It is best to use break statements sparingly It is best to completely avoid using continue statements, although some programmers do use them on rare occasions
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ANSWERS
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1 a true b true Note that expressions a and b mean exactly the same thing Because the operators == and < have higher precedence than &&, you do not need to include the parentheses The parentheses do, however, make it easier to read Most people nd the expression in a easier to read than the expression in b, even though they mean the same thing c true d true e false Since the value of the rst subexpression, (count == 1), is false, you know that the entire expression is false without bothering to evaluate the second subexpression Thus, it does not matter what the values of x and y are This is short-circuit evaluation f true Since the value of the rst subexpression, (count < 10), is true, you know that the entire expression is true without bothering to evaluate the second subexpression Thus, it does not matter what the values of x and y are This is short-circuit evaluation g false Notice that the expression in g includes the expression in f as a subexpression This subexpression is evaluated using short-circuit evaluation as we described for f The entire expression in g is equivalent to
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!( (true || (x < y)) && true )
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which in turn is equivalent to !( true && true ), and that is equivalent to !(true), which is equivalent to the nal value of false h This expression produces an error when it is evaluated because the rst subexpression, ((limit/count) > 7), involves a division by zero i true Since the value of the rst subexpression, (limit < 20), is true, you know that the entire expression is true without bothering to evaluate the second subexpression Thus, the second subexpression,
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((limit/count) > 7)
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is never evaluated, and so the fact that it involves a division by zero is never noticed by the computer This is short-circuit evaluation j This expression produces an error when it is evaluated because the rst subexpression, ((limit/count) > 7), involves a division by zero
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