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C++ Data Types
course content

Course Content

C++ Data Types

C++ Data Types

1. Introduction
OverviewArithmetic OperationsDivision int and doubleStandard MathSpecifying a Type
2. Numerical Data Types
Overview of Integer TypesApplications of Integer TypesType Modifiers for VariablesWorking with Floating-Point NumbersDouble-Precision Numbers
3. Text Data Type
Character Data TypeString Data TypeAccessing and Manipulating String ElementsCommon String MethodsString Manipulation PracticeSearching Within Strings
4. Other Data Types and Concepts
Boolean Data TypeBoolean ExpressionsVoid Data TypeAutomatic Type DeductionUnsigned Data TypesImplicit Type ConversionExplicit Type Conversion

book
Boolean Data Type

Boolean (bool) is a data type that can take one of two values: true or false. Syntax:

h

bool

copy

              
1

            
bool alive = true;

They are mostly used in comparison operators. Those operators (==, !=, <, >, >=, <=) return bool.

Note

std::cout prints booleans as numbers, 1 if the boolean is true, and 0 if the boolean is false.

cpp

main

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#include <iostream>

int main()
{
    bool istrue = true;
    bool obv = (5 > 0);
    bool wrong = (2 * 2 == 5);
    
    std::cout << istrue << std::endl;
    std::cout << obv << std::endl;
    std::cout << wrong << std::endl;
}

You can also flip the value of a boolean using the ! operator:

cpp

main

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123456789

            
#include <iostream>

int main()
{
    bool istrue = true;
    
    std::cout << istrue << std::endl;
    std::cout << !istrue << std::endl;
}

And most frequently, they are used as conditions in if/while/... statements.

cpp

main

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123456789101112

            
#include <iostream>

int main()
{
    bool b = true;
    
    if (b)
      std::cout << "b is true" << std::endl;
      
    if (1 > 0)
      std::cout << "1 is greater than 0" << std::endl;
}

The size of a bool is 1 byte. Yes, it would fit in 1 bit of memory, but you can't store a variable of size less than 1 byte (8 bit).

Choose the INCORRECT statement

Choose the INCORRECT statement

Select the correct answer

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Section 4. Chapter 1
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