Real-Life Examples of Variables in C

1. Why Use Variables in Real Life?

In real programs, we use variables to store and manage data — such as a student’s details, product price, employee salary, etc.
Variables make it easy to update, calculate, and display data whenever needed.

🧩 Example 1: Student Data Program

Let’s create a program that stores information about a student and prints it.

Code:

#include <stdio.h>

int main() {

  // Student data

  int studentID = 15;

  int studentAge = 23;

  float studentFee = 75.25;

  char studentGrade = ‘B’;

  // Print variables

  printf(“Student ID: %d\n”, studentID);

  printf(“Student Age: %d\n”, studentAge);

  printf(“Student Fee: %f\n”, studentFee);

  printf(“Student Grade: %c”, studentGrade);

  return 0;

}

✅ Output:

Student ID: 15

Student Age: 23

Student Fee: 75.250000

Student Grade: B

🔹 2. Explanation

🧩 Example 2: Calculate the Area of a Rectangle

Let’s create a program that calculates the area using length × width.

Code:

#include <stdio.h>

int main() {

  // Create integer variables

  int length = 4;

  int width = 6;

  int area;

  // Calculate the area of a rectangle

  area = length * width;

  // Print the variables

  printf(“Length is: %d\n”, length);

  printf(“Width is: %d\n”, width);

  printf(“Area of the rectangle is: %d”, area);

  return 0;

}

✅ Output:

Length is: 4

Width is: 6

Area of the rectangle is: 24

3. Explanation

📘 Formula Used:
[
\text{Area} = \text{Length} \times \text{Width}
]

Quick Summary