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Keywords like if and else are found in nearly every programming language. Other keywords such as dynamic_cast are unique to C++. The 74 keywords of C++ include all 32 of the keywords of the C language. There are two kinds of keywords: reserved words and standard identifiers. A reserved word is a keyword that serves as a structure marker, used to define the syntax of the language. The keywords if and else are reserved words. A standard identifier is a keyword that names a specific element of the language. The keywords bool and int are standard identifiers because they are names of standard types in C++. See Appendix B for more information on the C++ keywords. 3.4 COMPARISON OPERATORS The six comparison operators are
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x x x x x x < y > y <= y >= y == y != y // // // // // // x x x x x x is is is is is is less than y greater than less than or greater than equal to y not equal to y equal to y or equal to y y
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These can be used to compare the values of expressions of any ordinal type. The resulting integral expression is interpreted as a condition that is either false or true according to whether the value of the expression is zero. For example, the expression 7*8 < 6*9 evaluates to zero, which means that the condition is false. EXAMPLE 3.3 The Minimum of Two Integers
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This program prints the minimum of the two integers entered: int main() { int m, n; cout << "Enter two integers: "; cin >> m >> n; if (m < n) cout << m << " is the minimum." << endl; else cout << n << " is the minimum." << endl; } Enter two integers: 77 55 55 is the minimum.
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Note that in C++ the single equal sign = is the assignment operator, and the double equal sign == is the equality operator:
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x = 33; x == 33; // assigns the value 33 to x // evaluates to 0 (for false) unless 33 is the value of x
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This distinction is critically important. EXAMPLE 3.4 A Common Programming Error
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This program is erroneous: int main() { int n; cout << "Enter an integer: ";
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cin >> n; if (n = 22) cout << n << " = 22" << endl; else cout << n << " != 22" << endl;
// LOGICAL ERROR!
} Enter an integer: 77 22 = 22 The expression n = 22 assigns the value 22 to n, changing it from its previous value of 77. But the expression n = 22 itself is an integral expression that evaluates to 22 after it executes. Thus the condition (n = 22) is interpreted as being true, because only 0 yields false, so the statement before the else executes. The line should have been written as if (n == 22) cout << n << " = 22" << endl; // CORRECT
The error illustrated in Example 3.4 is called a logical error. This is the worst kind of error. Compile-time errors (e.g., omitting a semicolon) are caught by the compiler. Run-time errors (e.g., dividing by zero) are caught by the operating system. But no such help exists for catching logical errors. EXAMPLE 3.5 The Minimum of Three Integers
This program is similar to the one in Example 3.3 except that it applies to three integers: int main() { int n1, n2, n3; cout << "Enter three integers: "; cin >> n1 >> n2 >> n3; int min=n1; // now min <= n1 if (n2 < min) min = n2; // now min <= n1 and min <= n2 if (n3 < min) min = n3; // now min <= n1, min <= n2, and min <= n3 cout << "Their minimum is " << min << endl; } Enter two integers: 77 33 55 Their minimum is 33 The three comments track the progress of the program: min is initialized to equal n1, so it is the minimum of the set {n1}. After the first if statement executes, min is equal to either n1 or n2, whichever is smaller, so it is the minimum of the set {n1, n2}. The last if statement changes the value of min to n3 only if n3 is less than the current value of min which is the minimum of the set {n1, n2 }. So in either case, min becomes the minimum of the set {n1, n2, n3}.
3.5 STATEMENT BLOCKS A statement block is a sequence of statements enclosed by braces { }, like this:
{ int temp=x; x = y; y = temp; }
In C++ programs, a statement block can be used anywhere that a single statement can be used. EXAMPLE 3.6 A Statement Block within an if Statement
This program inputs two integers and then outputs them in increasing order: int main() { int x, y; cout << "Enter two integers: "; cin >> x >> y;
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