Introduction to Variables

What is a Variable?

A variable is like a container that holds information. You can store data in a variable and use it later in your program.

For example, if you want to store a person’s name or age, you can use variables to do that.

Video Help

Click the following button to get extra help on loops in coding

Creating Variables

You can create a variable and assign a value to it using the assignment operator =.

Example:

# Python Example
name = "Alice"  # This is a string variable
age = 15        # This is an integer variable

// JavaScript Example
let name = "Alice";  // This is a string variable
let age = 15;        // This is an integer variable


## Using Variables in Programs

Once you have created a variable, you can use it throughout your program.





```python
# Define variables
name = "John"  # Replace with the desired name
age = 25       # Replace with the desired age

# Print statements
print("My name is", name)
print("I am", age, "years old.")



My name is John
I am 25 years old.

%%js
// JavaScript Example
console.log("My name is " + name);
console.log("I am " + age + " years old.");


<IPython.core.display.Javascript object>

Naming Variables

When you create variables, it’s important to choose good names. Here are some tips:

Be Descriptive: Choose names that describe the data they hold, like age or favorite_color.

Use Camel Case: For multi-word names, use camel case (e.g., favoriteColor).

Avoid Spaces and Special Characters: Stick to letters, numbers, and underscores.

# Creating and using variables
city = "New York"
population = 8419600

print("The city is", city)
print("The population is", population)


The city is New York
The population is 8419600

%%js
// Creating and using variables
let city = "New York";
let population = 8419600;

console.log("The city is " + city);
console.log("The population is " + population);


<IPython.core.display.Javascript object>