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Your grade is a D. Your grade is an F. Error: score is out of range. Goodbye. After branching to case 8, and printing Your grade is a B. , the program execution goes right on to case 7 and prints Your grade is a C. Since the break statements have been removed, it keeps falling through, all the way down to the default clause, executing each of the cout statements along the way.
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3.12 THE CONDITIONAL EXPRESSION OPERATOR C++ provides a special operator that often can be used in place of the if...else statement. It is called the conditional expression operator. It uses the and the : symbols in this syntax:
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condition expression1 : expression2
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It is a ternary operator; i.e., it combines three operands to produce a value. That resulting value is either the value of expression1 or the value of expression2, depending upon the boolean value of the condition. For example, the assignment
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min = ( x<y x : y );
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would assign the minimum of x and y to min, because if the condition x<y is true, the expression ( x<y x : y ) evaluates to x; otherwise it evaluates to y. Conditional expression statements should be used sparingly: only when the condition and both expressions are very simple. EXAMPLE 3.19 Finding the Minimum Again
This program has the same effect as the program in Example 3.3 on page 38: int main() { int m, n; cout << "Enter two integers: "; cin >> m >> n; cout << ( m<n m : n ) << " is the minimum." << endl; } The conditional expression ( m<n m : n ) evaluates to m if m<n, and to n otherwise.
Review Questions
3.1 3.2 Write a single C++ statement that prints "Too many" if the variable count exceeds 100. What is wrong with the following code: a. cin << count; b. if x < y min = x
else min = y;
What is wrong with this code:
cout << "Enter n: "; cin >> n; if (n < 0) cout << "That is negative. Try again." << endl; cin >> n;
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[CHAP. 3
else cout << "o.k. n = " << n << endl;
3.4 3.5
3.8 3.9
What is the difference between a reserved word and a standard identifier State whether each of the following is true or false. If false, tell why. a. !(p || q) is the same as !p || !q b. !!!p is the same as !p c. p && q || r is the same as p && (q || r) Construct a truth table for each of the following boolean expressions, showing its truth value (0 or 1) for all 4 combinations of truth values of its operands p and q. a. !p || q b. p&&q || !p&&!q c. (p||q) && !(p&&q) Use truth tables to determine whether the two boolean expressions in each of the following are equivalent. a. !(p && q) and !p && !q b. !!p and p c. !p || q and p || !q d. p && (q && r) and (p && q) && r e. p || (q && r) and (p || q) && r What is short-circuiting and how is it helpful What is wrong with this code:
if (x = 0) cout << x << " = 0\n"; else cout << x << " != 0\n";
3.10 What is wrong with this code:
if (x < y < z) cout << x << " < " << y << " < " << z << endl;
Construct a logical expression to represent each of the following conditions: a. score is greater than or equal to 80 but less than 90; b. answer is either 'N' or 'n'; c. n is even but not 8; d. ch is a capital letter. 3.12 Construct a logical expression to represent each of the following conditions: a. n is between 0 and 7 but not equal to 3; b. n is between 0 and 7 but not even; c. n is divisible by 3 but not by 30; d. ch is a lowercase or uppercase letter. 3.13 What is wrong with this code:
if (x == 0) if (y == 0) cout << "x and y are both zero." << endl; else cout << "x is not zero." << endl;
3.14 What is the difference between the following two statements:
if (n > 2) { if (n < 6) cout << "OK"; } else cout << "NG"; if (n > 2) { if (n < 6) cout << "OK"; else cout << "NG"; }
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