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C program to demonstrate example of structure pointer (structure with pointer)

In this program, we will learn how to use structure with the pointers? How to declare a structure pointer (pointer to structure object), how to assign values to the structure members and how to access them using structure pointer?

C - Structure with pointer example

In this example, we are implementing a structure item, declaring structure pointer pItem and by using pItem, we will assign and access the elements of the structure.

/* C program to demonstrate example of structure pointer 
(structure with pointer)*/

#include <stdio.h>

struct item {
    char itemName[30];
    int qty;
    float price;
    float amount;
};

int main()
{
    struct item itm; /*declare variable of structure item*/
    struct item* pItem; /*declare pointer of structure item*/

    pItem = &itm; /*pointer assignment - assigning address of itm to pItem*/

    /*read values using pointer*/
    printf("Enter product name: ");
    gets(pItem->itemName);
    printf("Enter price:");
    scanf("%f", &pItem->price);
    printf("Enter quantity: ");
    scanf("%d", &pItem->qty);

    /*calculate total amount of all quantity*/
    pItem->amount = (float)pItem->qty * pItem->price;

    /*print item details*/
    printf("\nName: %s", pItem->itemName);
    printf("\nPrice: %f", pItem->price);
    printf("\nQuantity: %d", pItem->qty);
    printf("\nTotal Amount: %f", pItem->amount);

    return 0;
}

Output

Enter product name: Pen 
Enter price:5.50 
Enter quantity: 15 
 
Name: Pen 
Price: 5.500000 
Quantity: 15 
Total Amount: 82.500000

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