`pc013.c`¶

Problem Statement

Write a C program that defines a structure named Book with attributes bookID (int), title (string), and price (float). Include a user-defined function named updatePrice with the signature: void updatePrice(struct Book *b, float newPrice); The program should: Accept details for one book from the user. Display the details before the update. Use the function to update the price of the book. Display the updated details.

Metadata¶

Property	Detail
Author	Amit Dutta (amitdutta4255@gmail.com)
License	MIT
Difficulty	Intermediate (index: 5 / 10)

Concepts¶

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Pointers
Recursion
Array
Iteration

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Source Code¶

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct Book
{
    int bookID;
    float price;
    char title[20];
} Book;

void acceptDetails(Book *);
void displayDetails(Book *);
void updatePrice(struct Book *, float);

int main()
{
    Book book1;
    float newPrice;
    acceptDetails(&book1);
    displayDetails(&book1);
    printf("\n\nEnter the updated price: ");
    if (scanf("%f", &newPrice) != 1)
    {
        printf("\nInvalid Price!");
        exit(1);
    }
    updatePrice(&book1, newPrice);
    displayDetails(&book1);
    return 0;
}

void acceptDetails(Book *book)
{
    char *p;
    printf("\n== Enter details for the book ==\n");
    printf("Enter Book ID:    ");
    if (scanf("%d", &book->bookID) != 1)
    {
        printf("\nInvalid Book ID!");
        exit(1);
    }
    while (getchar() != '\n')
        ;
    printf("Enter Book Title: ");
    if (fgets(book->title, sizeof(book->title), stdin) == NULL)
    {
        printf("\nError reading input!");
        exit(1);
    }
    p = strchr(book->title, '\n');
    if (p)
        *p = '\0';
    printf("Enter Price:      ");
    if (scanf("%f", &book->price) != 1)
    {
        printf("\nInvalid Price!");
        exit(1);
    }
}

void displayDetails(Book *book)
{
    printf("\n== Details of the Book ==");
    printf("\nBook ID:    %d", book->bookID);
    printf("\nBook Title: %s", book->title);
    printf("\nBook Price: %g", book->price);
}

void updatePrice(struct Book *book, float newPrice)
{
    book->price = newPrice;
}

Explanation¶

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    You are explaining a C programming code to a beginner.

    STRICT RULES:

    - Only use the given code. Do NOT assume anything not present.

    - Do NOT add extra examples.

    - Keep explanation clear and short.

    - If something is unclear, say "Not clear from code".

    - Follow the exact format below. Do NOT change headings.

    FORMAT:

    [START]

    ## What it does

    (Explain the overall purpose in 1-2 sentences)

    ## Step-by-step

    (Explain how the code works in steps, simple language)

    ## Key Concepts

    (List concepts like loop, condition, function, etc.)

    ## Notes

    (Mention any limitations, errors, or assumptions)

    [END]

    CODE (pc013.c):

    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>

    typedef struct Book
    {
        int bookID;
        float price;
        char title[20];
    } Book;

    void acceptDetails(Book *);
    void displayDetails(Book *);
    void updatePrice(struct Book *, float);

    int main()
    {
        Book book1;
        float newPrice;
        acceptDetails(&book1);
        displayDetails(&book1);
        printf("\n\nEnter the updated price: ");
        if (scanf("%f", &newPrice) != 1)
        {
            printf("\nInvalid Price!");
            exit(1);
        }
        updatePrice(&book1, newPrice);
        displayDetails(&book1);
        return 0;
    }

    void acceptDetails(Book *book)
    {
        char *p;
        printf("\n== Enter details for the book ==\n");
        printf("Enter Book ID:    ");
        if (scanf("%d", &book->bookID) != 1)
        {
            printf("\nInvalid Book ID!");
            exit(1);
        }
        while (getchar() != '\n')
            ;
        printf("Enter Book Title: ");
        if (fgets(book->title, sizeof(book->title), stdin) == NULL)
        {
            printf("\nError reading input!");
            exit(1);
        }
        p = strchr(book->title, '\n');
        if (p)
            *p = '\0';
        printf("Enter Price:      ");
        if (scanf("%f", &book->price) != 1)
        {
            printf("\nInvalid Price!");
            exit(1);
        }
    }

    void displayDetails(Book *book)
    {
        printf("\n== Details of the Book ==");
        printf("\nBook ID:    %d", book->bookID);
        printf("\nBook Title: %s", book->title);
        printf("\nBook Price: %g", book->price);
    }

    void updatePrice(struct Book *book, float newPrice)
    {
        book->price = newPrice;
    }

pc013.c¶