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In C++, a _ is a named container that stores a value of a specific data type.

When declaring a variable, we specify the variable's data type, followed by the variable's name.

For example:

1int age;

In the above example, we declare a variable named age of type int, which can hold positive or negative whole numbers.

C++ provides several built-in data types, including:

• int - for integers
• float - for floating-point numbers
• char - for single characters
• string - for sequences of characters
• bool - for boolean values (true or false)

Here's an example that demonstrates declaring variables of different data types and outputting their values:

1#include <iostream>
2
3using namespace std;
4
5int main() {
6    // Declare variables
7    int age = 25;
8    float height = 6.2;
9    char gender = 'M';
10    string name = "John Doe";
11    bool isEmployed = true;
12
13    // Output variables
14    cout << "Name: " << name << endl;
15    cout << "Age: " << age << endl;
16    cout << "Height: " << height << " feet" << endl;
17    cout << "Gender: " << gender << endl;
18    cout << "Employed: " << boolalpha << isEmployed << endl;
19
20    return 0;
21}

By understanding how to declare variables and the different data types in C++, you are equipped with the basic knowledge to start working with data in C++. This is an important foundation for learning more advanced concepts in programming and applying them in finance.