7) Inputs, Data Types, and Assigning¶

Variables¶

#include <iostream>
using namespace std;
int main()
{
        cout << "Enter a number: " << endl;
        cin;
        cout << "Your number is: ";
        return 0;
}

Enter a number:
Your number is:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10

     #include <iostream>
     using namespace std;
     int main()
     {
             int number; // This is the Variable Declaration statement
             cout << "Enter a number: " << endl;
             cin >> number;
             cout << "Your number is: " << number;
             return 0;
     }

• To make sure the computer actually remembers values, be they input or not, Variables are used. Variables store values. In this case, they’re storing numbers.

• The computer doesn’t automatically create Memory Locations. The Programmer has to directly tell the computer to do so, that’s what Line #5 is. It’s declaring a Memory Location. This Memory Location acts exactly like a Maths Variable, and can be assigned values.

• The Variable’s name is number. It can be named anything else, such as a, b, x, name, donut, etc.

• The Variable also has a specific Data Type. int is the Data Type of Integer.

Data Types¶

• Integer (Declared by int)

• Float (Declared by float)

• Double (Declared by double)

• Boolean (Declared by bool)

• Character (Declared by char)

• String (Declared by string)

Integer¶

Float and Double¶

1
2
3
4
5
6

     #include <iostream>
     using namespace std;
     int main()
     {
             cout << int((2.3 - 2.0) * 10) << endl;
     }

Boolean¶

Character¶

String¶

#include <string>

Declaration and Assigning¶

 1
 2
 3
 4
 5
 6
 7
 8
 9
10

     int a;
     int a = 2;
     float num;
     float num1 = 2;
     double num2 = 3.5
     bool isEven = false;
     char c = 'p';
     string a, b, c;
     string name = "John Cena";
     int a = 2, b = 3, c = 4;