1. Boolean Variables & Values

2. Motivation: why Booleans?
1. To "save and reuse" the result of a "complex" logical decision 2. To improve Clarity of the source code 3. To improve the Efficiency of decisions in a program.

3. bool is a C++ Data Type
Boolean literals: true false Example declarations: bool isVIP = true; bool error = false; const bool verdad = true;

4. Assignment
Syntax: boolVar = conditional expression ; Example declarations: bool isPos; int a = 3; isPos = (a > 0); // isPos=true

5. Example
Engineering Honor Student: must have 1. completed 48 credits overall 2. completed 24 credits in EGR 3. have a GPA of 3.25 or higher overall 4. have a GPA of 3.5 or higher in EGR courses.

6. Example
bool isEgrHonor; isEgrHonor = (totCredits >= 48) && (egrCredits >= 24) && (gpa >= 3.0) && (egrGpa >= 3.5); ... if (isEgrHonor) cout << "Engineering Honor Student";

7. Do not cin/cout Booleans They will not work as expected.
User I/O
Do not cin/cout Booleans They will not work as expected.

8. User I/O cin >> yesNo; isEgrHonor = (yesNo == "Yes"); ...
bool isEgrHonor;
string yesNo;
cout << "Is EGR Honor Student? (Yes/No)";
cin >> yesNo;
isEgrHonor = (yesNo == "Yes");
...
if (isEgrHonor)
cout << "Is an EGR Honor Student";
else
cout << "Is NOT an EGR Honor Stud";

9. Vocabulary Term Definition Boolean
a value of true or false; a variable with a value of true or fals