Basic programming course: Lesson #2 - Variables and Types of Data

_{Made in canva}

Variable

Variables are like containers that store data values. In programming, it acts as a placeholder that you can update and manipulate in your program throughout the program. These variables make the code more flexible and reusable. Because you can assign them different values without changing the program structure.

Uses of Variable

Storing Data:
Variables hold values such as numbers text and various complex data types.

Example: let age = 25;

Making Code Dynamic:
Using variables a program can perform actions on different inputs.

Example: let x = 5; let y = x * 2; (value of y depends on x)

Data Manipulation:
Using variables we can perform different operations like addition and subtraction or even complex algorithms.

Example: total = price * quantity;

Improving Readability:
Naming variables makes the code easier to understand, so it improves our readability.

Example: let userName = "Alice";

Types of Variable

Integer: Whole numbers like 1, 10, 50.
String: Text or sequence of characters like "Hello World".
Boolean: True or false values used in logical expression.
Array or object: Used to store multiple values or complex data.

Here I am explaining how we assign variables to data types and their explanation.

   Define name, last_name as Character;
   Print "Enter your name:";
   Read name;
   Print "Enter your last name:";
   Read last_name;
   Print "Hello " name " " last_name ", welcome";
EndAlgorithm

Define Variable:

We recognize name and last_name as character data types or as strings, which means they store text data.

Define name, last_name as Character;

Prompt for First Name:

In this, the program prints a message such as "Enter your name:" to prompt the user to enter their first name.

Print "Enter your name:";

Read User Input (First Name):

Here the program waits for the user to type his first name and stores his input in a variable name.

Read name;

Prompt for Last Name:

The program prints the message "Enter your last name:" to prompt the user to enter their last name.

Print "Enter your last name:";

Read User Input (Last Name):

The program waits here for the user to type his last name and stores his input in a variable last_name.

Read last_name;

Display Greeting Message:

Finally, the program prints a greeting message using the user's input. The output is in the format: " Hello <name> <last_name>, welcome".

It concatenates the name, a space " ", and the last_name into one string before displaying it.

Print "Hello " name " " last_name ", welcome";

Example:

If the user inputs:

• First name: Alice
• Last name: Smith
  The final output would be:
  Hello Alice Smith, welcome

I have a DEV C++ software on my laptop so I develop this code in C++. Here is the code:

#include <iostream>  // For input and output operations

using namespace std;

int main() {
    // Step 1: Declare variables
    float price_steem, amount_steem, total;

    // Step 2: Request the user for the amount of STEEM
    cout << "Enter the amount of STEEM: ";
    cin >> amount_steem;

    // Step 3: Request the user for the current price of 1 STEEM in USD
    cout << "Enter the current price of 1 STEEM in USD: ";
    cin >> price_steem;

    // Step 4: Calculate the total value in USD
    total = amount_steem * price_steem;

    // Step 5: Show the result on the screen
    cout << "The total value of your STEEM in USD is: " << total << endl;

    return 0;
}

Input:

_{Secreenshot of Input From DEV C++}

Example of Execution:

User Input:
Enter the amount of STEEM: 100
Enter the current price of 1 STEEM in USD: 0.25
Output:
The total value of your STEEM in USD is: 25

This code follows the basic steps of input, process, and output, making it easy to understand and implement.

Output:

_{Secreenshot of Execution}

Thank you so much all for staying here. Here my task is complete.

Invitation:

@rumaish, @josepha, @neelofar

Cc:

@alejos7ven

_{Dated: 17-09-2024 About Me}