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bool is not a built-in C data type. It is a macro created using the #define mechanism to provide a pret-
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tier version of its underlying type, _Bool. The file <stdbool.h> gives you access to true and false and contains the definition of bool. We ll get into macros and #define in 8.
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Take another look at Table 6-2. The ! operator converts true into false and false into true. What this really means is that ! converts 1 to 0 and 0 to 1, which comes in handy when you are working with an if statement s expression, like this one:
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if ( mySecondBool ) printf( "mySecondBool must be true" );
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The previous chunk of code translated mySecondBool from false to true, which is the same thing as saying that mySecondBool has a value of 1. Either way, mySecondBool will cause the if to fire, and the printf() will get executed.
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CHAPTER 6: Controlling Your Program s Flow
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Take a look at this piece of code:
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if ( ! mySecondBool ) printf( "mySecondBool must be false" );
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This printf() will get executed if mySecondInt is false. Do you see why If mySecondBool is false, then !mySecondInt must be true. The ! operator is a unary operator. Unary operators operate on a single expression. The other two logical operators, && and ||, are binary operators. Binary operators, such as the == operator presented earlier, operate on two expressions, one on the left side and one on the right side of the operator. The && operator is commonly referred to as the logical and operator. The result of an && operation is true if, and only if, both the left side and the right side are true. Here s an example:
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bool hasCar, hasTimeToGiveRide;
hasCar = true; hasTimeToGiveRide = true; if ( hasCar && hasTimeToGiveRide ) printf( "Hop in - I'll give you a ride!\n" ); else printf( "I have no car, no time, or no car and no time!\n" );
This example uses two variables. One indicates whether the program has a car, the other whether the program has time to give us a ride to the mall. All philosophical issues aside (can a program have a car ), the question of the moment is, which of the two printf() s will fire Since both sides of the && were set to true, the first printf() will be called. If either one (or both) of the variables were set to false, the second printf() would be called. Another way to think of this is that we ll only get a ride to the mall if our friendly program has a car and has time to give us a ride. If either of these is not true, we re not getting a ride. By the way, notice the use here of the second form of if, the if-else statement. The || operator is commonly referred to as the logical or operator. The result of a || operation is true if the left side, the right side, or both sides of the || are true. Put another way, the result of a || is false if, and only if, both the left side and the right side of the || are false. Here s an example:
bool nothingElseOn, newEpisode;
nothingElseOn = true; newEpisode = true;
CHAPTER 6: Controlling Your Program s Flow
if ( newEpisode || nothingElseOn ) printf( "Let's watch Family Guy!\n" ); else printf( "Something else is on or I've seen this one.\n" );
This example uses two variables to decide whether or not we should watch Family Guy. One variable indicates whether anything else is on right now, and the other tells you whether this episode is a rerun. If this is a brand-new episode or if nothing else is on, we ll watch Family Guy. Here s a slight twist on the previous example:
int nothingElseOn, itsARerun;
nothingElseOn = true; itsARerun = false; if ( (! itsARerun) || nothingElseOn ) printf( "Let's watch Family Guy!\n" ); else printf( "Something else is on or I've seen this one.\n" );
This time, we ve replaced the variable newEpisode with its exact opposite, itsARerun. Look at the logic that drives the if statement. Now we re combining itsARerun with the ! operator. Before, we cared whether the episode was a newEpisode. This time, we are concerned that the episode is not a rerun. See the difference Both the && and the || operators are summarized in the table in Table 6-3. Note that A&&B is only true if A and B are both true. A||B is true if A, B, or both are true.
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