Here are 10 C programming exercises that involve structures:

Student Database: Create a structure to represent a student with fields like name, roll number, and marks in different subjects. Write functions to input and display student details.
Employee Management System: Develop a program to manage employee records using structures. Include fields like employee ID, name, salary, and designation. Implement functions to add, delete, and display employee details.
Book Inventory: Build a program that uses a structure to represent a book with attributes such as title, author, and price. Write functions to add books to an inventory and display the book details.
Bank Account Management: Create a structure to represent a bank account with fields like account number, account holder name, and balance. Implement functions for deposit, withdrawal, and displaying account details.
Rectangle Operations: Define a structure to represent a rectangle with attributes like length and width. Write functions to calculate the area and perimeter of the rectangle.
Date Validation: Develop a program that uses a structure to represent a date (day, month, year). Implement a function to validate whether the entered date is valid or not.
Time Conversion: Create a structure to represent time (hours, minutes, seconds). Write functions to convert time from 12-hour format to 24-hour format and vice versa.
Point in Space: Define a structure to represent a point in three-dimensional space (x, y, z). Write functions to calculate the distance between two points and the midpoint of a line segment.
Temperature Conversion: Build a program that uses a structure to represent temperature in Celsius and Fahrenheit. Implement functions to convert temperatures between the two scales.
Address Book: Design a program that maintains an address book using structures. Include fields like name, address, and phone number. Implement functions to add, delete, and search for contacts in the address book.

These exercises cover a range of struct-related concepts and will help you practice and strengthen your skills in C programming. I have solved all of the above with explanatory comments. You should first make a sincere attempt at solving these problems before looking at the solutions.

Student Database:

 #include <stdio.h>

 // Structure to represent a student
 struct Student {
     char name[50];
     int rollNumber;
     float marks;
 };

 // Function to input student details
 void inputStudent(struct Student *s) {
     printf("Enter name: ");
     scanf("%s", s->name);
     printf("Enter roll number: ");
     scanf("%d", &s->rollNumber);
     printf("Enter marks: ");
     scanf("%f", &s->marks);
 }

 // Function to display student details
 void displayStudent(struct Student s) {
     printf("Name: %s\nRoll Number: %d\nMarks: %.2f\n", s.name, s.rollNumber, s.marks);
 }

 int main() {
     // Create a student
     struct Student student1;

     // Input and display student details
     inputStudent(&student1);
     displayStudent(student1);

     return 0;
 }

Employee Management System:

 #include <stdio.h>

 // Structure to represent an employee
 struct Employee {
     int employeeID;
     char name[50];
     float salary;
     char designation[50];
 };

 // Function to display employee details
 void displayEmployee(struct Employee e) {
     printf("Employee ID: %d\nName: %s\nSalary: %.2f\nDesignation: %s\n", e.employeeID, e.name, e.salary, e.designation);
 }

 int main() {
     // Create an employee
     struct Employee employee1 = {101, "John Doe", 50000.0, "Software Engineer"};

     // Display employee details
     displayEmployee(employee1);

     return 0;
 }

Book Inventory:

 #include <stdio.h>

 // Structure to represent a book
 struct Book {
     char title[100];
     char author[50];
     float price;
 };

 // Function to display book details
 void displayBook(struct Book b) {
     printf("Title: %s\nAuthor: %s\nPrice: %.2f\n", b.title, b.author, b.price);
 }

 int main() {
     // Create a book
     struct Book book1 = {"The Catcher in the Rye", "J.D. Salinger", 12.99};

     // Display book details
     displayBook(book1);

     return 0;
 }

Bank Account Management:

 #include <stdio.h>

 // Structure to represent a bank account
 struct BankAccount {
     int accountNumber;
     char accountHolderName[50];
     float balance;
 };

 // Function to display account details
 void displayAccount(struct BankAccount acc) {
     printf("Account Number: %d\nAccount Holder: %s\nBalance: %.2f\n", acc.accountNumber, acc.accountHolderName, acc.balance);
 }

 int main() {
     // Create a bank account
     struct BankAccount account1 = {1001, "Alice Johnson", 5000.0};

     // Display account details
     displayAccount(account1);

     return 0;
 }

Rectangle Operations:

 #include <stdio.h>

 // Structure to represent a rectangle
 struct Rectangle {
     float length;
     float width;
 };

 // Function to calculate area of rectangle
 float calculateArea(struct Rectangle r) {
     return r.length * r.width;
 }

 // Function to calculate perimeter of rectangle
 float calculatePerimeter(struct Rectangle r) {
     return 2 * (r.length + r.width);
 }

 int main() {
     // Create a rectangle
     struct Rectangle rectangle1 = {5.0, 3.0};

     // Calculate and display area and perimeter
     printf("Area: %.2f\n", calculateArea(rectangle1));
     printf("Perimeter: %.2f\n", calculatePerimeter(rectangle1));

     return 0;
 }

Date Validation:

 #include <stdio.h>

 // Structure to represent a date
 struct Date {
     int day;
     int month;
     int year;
 };

 // Function to validate date
 int isValidDate(struct Date d) {
     // Simple validation (ignoring leap years, etc.)
     return (d.day >= 1 && d.day <= 31 && d.month >= 1 && d.month <= 12 && d.year >= 1900);
 }

 int main() {
     // Create a date
     struct Date date1 = {15, 8, 2023};

     // Validate and display result
     if (isValidDate(date1)) {
         printf("Valid date.\n");
     } else {
         printf("Invalid date.\n");
     }

     return 0;
 }

Time Conversion:

 #include <stdio.h>

 // Structure to represent time
 struct Time {
     int hours;
     int minutes;
     int seconds;
 };

 // Function to convert time to 24-hour format
 struct Time convertTo24Hour(struct Time t12) {
     // Assume t12 is in 12-hour format
     if (t12.hours == 12) {
         t12.hours = 0;
     }

     if (t12.seconds >= 0 && t12.seconds <= 59 && t12.minutes >= 0 && t12.minutes <= 59 && t12.hours >= 0 && t12.hours <= 11) {
         // AM
         return t12;
     } else if (t12.seconds >= 0 && t12.seconds <= 59 && t12.minutes >= 0 && t12.minutes <= 59 && t12.hours >= 12 && t12.hours <= 23) {
         // PM
         t12.hours = t12.hours - 12;
         return t12;
     } else {
         // Invalid time
         struct Time invalidTime = {-1, -1, -1};
         return invalidTime;
     }
 }

 int main() {
     // Create a time in 12-hour format
     struct Time time12 = {3, 45, 30}; // 3:45:30 AM

     // Convert and display time in 24-hour format
     struct Time time24 = convertTo24Hour(time12);
     if (time24.hours != -1) {
         printf("Time in 24-hour format: %02d:%02d:%02d\n", time24.hours, time24.minutes, time24.seconds);
     } else {
         printf("Invalid time.\n");
     }

     return 0;
 }

Point in Space:

 #include <stdio.h>
 #include <math.h>

 // Structure to represent a point in 3D space
 struct Point {
     float x;
     float y;
     float z;
 };

 // Function to calculate distance between two points
 float calculateDistance(struct Point p1, struct Point p2) {
     return sqrt(pow(p2.x - p1.x, 2) + pow(p2.y - p1.y, 2) + pow(p2.z - p1.z, 2));
 }

 // Function to calculate midpoint of a line segment
 struct Point calculateMidpoint(struct Point p1, struct Point p2) {
     struct Point midpoint;
     midpoint.x = (p1.x + p2.x) / 2;
     midpoint.y = (p1.y + p2.y) / 2;
     midpoint.z = (p1.z + p2.z) / 2;
     return midpoint;
 }

 int main() {
     // Create two points
     struct Point point1 = {1.0, 2.0, 3.0};
     struct Point point2 = {4.0, 5.0, 6.0};

     // Calculate and display distance and midpoint
     printf("Distance: %.2f\n", calculateDistance(point1, point2));
     struct Point midpoint = calculateMidpoint(point1, point2);
     printf("Midpoint: (%.2f, %.2f, %.2f)\n", midpoint.x, midpoint.y, midpoint.z);

     return 0;
 }

Temperature Conversion:

 #include <stdio.h>

 // Structure to represent temperature
 struct Temperature {
     float celsius;
     float fahrenheit;
 };

 // Function to convert temperature from Celsius to Fahrenheit
 float convertCtoF(float celsius) {
     return (celsius * 9 / 5) + 32;
 }

 // Function to convert temperature from Fahrenheit to Celsius
 float convertFtoC(float fahrenheit) {
     return (fahrenheit - 32) * 5 / 9;
 }

 int main() {
     // Create a temperature in Celsius
     struct Temperature tempC = {25.0, convertCtoF(25.0)};

     // Display temperature in Fahrenheit
     printf("Temperature in Fahrenheit: %.2f\n", tempC.fahrenheit);

     // Create a temperature in Fahrenheit
     struct Temperature tempF = {convertFtoC(98.6), 98.6};

     // Display temperature in Celsius
     printf("Temperature in Celsius: %.2f\n", tempF.celsius);

     return 0;
 }

Address Book:

#include <stdio.h>

// Structure to represent a contact
struct Contact {
    char name[50];
    char address[100];
    char phoneNumber[15];
};

// Function to display contact details
void displayContact(struct Contact c) {
    printf("Name: %s\nAddress: %s\nPhone Number: %s\n", c.name, c.address, c.phoneNumber);
}

int main() {
    // Create a contact
    struct Contact contact1 = {"John Doe", "123 Main St, Cityville", "555-1234"};

    // Display contact details
    displayContact(contact1);

    return 0;
}

Basic Structure Programming Questions

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Jyotiprakash Mishra

Jyotiprakash Mishra