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20 Cards in this Set
- Front
- Back
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What relational operator is used in C++ to test for equality?
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==
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What relational operator is used in C++ to test for non-equality?
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!=
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Which symbol is used as a logical OR operator in C++?
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||
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Which symbol is used as a logical AND operator in C++?
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&&
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Evaluate the following as either true or false, where a = 0 and b = 10,
(a == 0) && (b < 30) |
true
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Evaluate the following as either true or false, where a = 0 and b = 10,
(b < 15) && (a == 10) |
false
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Evaluate the following as either true or false, where a = 0 and b = 10,
(a == 3) && (c <= d) |
false
It doesn't matter if you know the values for c and d since the left side evaluates to false. Review 'short-circuit evaluation'. |
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What is an expression called that evaluates to either true or false?
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a logical (Boolean) expression
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What is the logical (Boolean) operator for NOT in C++?
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!
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What is the term used to refer to one control statement located within another control statement?
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nested
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Use the ternary operator, ?: , to rewrite the following conditional statement,
if (x >= y) total = x; else total = y; |
total = (x >= y) ? x : y;
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Is it possible to have a stand-alone 'else' statement?
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No. It is possible to have a single 'if' statement but every 'else' must have a related 'if' statement.
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What does the break statement do within a switch block?
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It will immediately exit the switch statement.
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Will the following statement always evaluate to 'true'?
if (test = 50) grade = 'A'; |
Yes, because the assignment operator = is used, test will be set to 50 and always be true. Know the difference between the assignment operator and the equality operator ==.
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What is a statement called that is enclosed within a pair of braces?
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compound statement - it will be treated as a single statement.
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A control structure alters the normal sequential flow of execution in a program.
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true
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In C++, all relational operators are evaluated before logical operators.
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true
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With short-circuit evaluation, the computer evaluates the logical expression from left to right.
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true
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Every if statement must have a corresponding else.
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false
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In a switch statement, every case must have a break.
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false
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