Variables in Java/C++

In Java and C++, a variable is a location in memory that can hold a value of a specific type. In order to use a variable in a program, you must first declare it to specify the type and name of the variable. Here is an example of declaring an integer variable in both Java and C++:

Java:

int num;

C++:

int num;

Once you have declared a variable, you can assign a value to it using the assignment operator (=). For example:

Java:

num = 5;

C++:

num = 5;

You can then use the variable in your program by referencing its name. For example:

Java:

System.out.println(num);  // Outputs "5"

C++:

cout << num << endl;  // Outputs "5"

It's important to note that variables in Java and C++ can only hold values of a specific type. For example, you cannot assign a string value to an integer variable. You must declare a separate variable for each type of value you want to store in your program.