Global Variables

In C++, global variables are variables that are defined outside of all functions and are usually defined at the beginning of a program. They can be utilized anywhere in the program after their declaration.

Syntax

data_type global_variable = value;

• data_type: Specifies the data type of the global variable.
• global_variable: The name of the global variable.
• value (Optional): The initial value assigned to the global variable.

Example

The following example defines a global variable, modifies its value and prints the result:

#include <iostream>
using namespace std;

// Define a global variable
int num = 9;

int main()
{
  // Modify the value of the global variable
  ++num;

  // Print the result
  cout << num << endl;

  return 0;
}

The above code produces the following output:

10

Codebyte Example

The following codebyte example demonstrates the usage of global variables:

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