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Figure Al
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Examples of bitwise operators
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1 Unsigned objects are best for bitwise operators because the results of the bit shifts can be machine dependent for signed objects
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1 / / Faculty Profile Fields 2 enum 3 i 4 SEX = 0x0001, / / On if female 5 MINORITY = 0x0002, / / On if in a minority group 6 VETERAN = 0x0004, / / On if veteran 7 DISABLED = 0x0008, / / On if disabled 8 US-CITIZEN = 0x0010, / / On if citizen 9 DOCTORATE = 0x0020, / / On if holds a doctorate 10 TENURED = 0x0040, / / On if tenured 11 TWELVE-MON = 0x0080, / / On if on 12 month contract 12 VISITOR = 0x0100, / / On if not permanent faculty 13 CAMPUS = 0x0200, / / On if work is at main campus 14 15 W K = 0 x 0 ~ 0 0 , / Two bits to represent rank / 16 ASSISTANT = 0x0400, / / Assistant Professor 17 ASSOCIATE = 0x0800, / / Associate Professor 18 FULL = 0 x 0 ~ 0 0 , / Full Professor / 19 20 COLLEGE = Oxf000, / / Represents 16 colleges 21 22 ART-SCIENCE = 0x3000, / / Arts and Science = College # 3 23 24 I ; 25 / / Later in a function initialize appropriate fields 26 tim = ART-SCIENCE I ASSOCIATE ( CAMPUS I TENURED 1 27 TWELVE-MON I DOCTORATE I US-CITIZEN; 28 / / Promote tim TO ~ u l lProfessor 29 30 tim & = -RANK; / / Turn all rank rields off 31 tim I = FULL; / / Turn rank fields on
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Figure A2
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or Ox3af O This bit pattern is formed by applying the OR operator on the appropriate fields Lines 30 and 3 1 show the logic used when Tim is deservedly promoted to the rank of full professor The MK category has the two rank bits set to 1 and all the other bits set to 0; or
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The complement, -RANK, is thus
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Applying a bitwise AND of this pattern and tim's current setting turns off tim's rank bits, giving
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The result of the bitwise OR operator at line 3 1 thus makes tim a full professor without altering any other bits, yielding
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We learn that Tim is tenured because t im&TENURED is a nonzero result We can also find out that Tim is in College #3 by shifting to the right 12 bits and then looking at the resulting low 4 bits Note that parentheses are required The expression is (tim>>l2) &Ox
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A24
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The conditional operator : is used as a shorthand for simple if -else statements
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The Conditional Operator
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The conditional operator : is shorthand for simple if -else statements ~ h general form is ,
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testExpr
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yesExpr
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noExpr
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We evaluate testExpr first; then we evaluate either yesExpr or noExpr, giving the result of the entire expression We evaluate yesExpr if testExpr is true; otherwise, noExpr is evaluated The precedence of the conditional operator is just above the assignment operators This precedence allows us to avoid using parentheses when assigning the result of the conditional operator to an object For example, the minimum of x and y is assigned to minval as follows:
Command-Line Arguments
Command-line arguments are available by declaring main with the signature
int main( int argc, char *argv[
Here argc is the number of command-line arguments (including the command name), and argv is an array of primitive strings (char * objects) that store the command-line arguments As an example, the program shown in Figure A3 implements the echo command
lnput and Output
2 using namespace std;
4 int main( int argc, char *argv[ ] 5 { 6 for( int i = 1; i < argc; i++ 7 cout << argv[ i ] << " " ; 8 cout << endl;
9 10
11 I
return 0;
Figure A3
The echo command
lnput and Output
Input and output (110) in C++ is achieved through the use of streams The header file iostream is included for all basic 110 Although the C library routines (eg print and scanf) also work, their use is strongly discouraged The iostream library is very sophisticated and has many options We examine only the most basic ones used
A41