C Programming Code Examples

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C Program to Support Infinite Precision Arithmetic & Store a Number as a List of Digits

C Program to Support Infinite Precision Arithmetic & Store a Number as a List of Digits

This C Program creates a support for infinite precision arithmetic which allows storage of large integers which is beyond the range of the integral limit. C is architecture dependent so primitive data type such as int is not capable of storing large integral values. So we make use of linked list in order to create and store such great integral values.

    #include <stdio.h>

    #include <stdlib.h>

    #include <ctype.h>

    struct node

    {

        int number;

        struct node *next;

    };

    int feednumber(struct node **);

    void release(struct node **);

    void display(struct node *);

    int main()

    {

        struct node *p = NULL;

        int pcount = 0, qcount = 0;

        printf("Enter number of any length\n");

        pcount = feednumber(&p);

        printf("Number of integers entered are: %d\n", pcount);

        printf("Displaying the number entered:\n");

        display(p);

        release(&p);

        return 0;

    }

    /*Function to create nodes of numbers*/

    int feednumber(struct node **head)

    {

        char ch, dig;

        int count = 0;

        struct node *temp, *rear = NULL;

        ch = getchar();

        while (ch != '\n')

        {

            dig = atoi(&ch);

            temp = (struct node *)malloc(sizeof(struct node));

            temp->number = dig;

            temp->next = NULL;

            count++;

            if ((*head) == NULL)

            {

                *head = temp;

                rear = temp;

            }

            else

            {

                rear->next = temp;

                rear = rear->next;

            }

            ch = getchar();

        }

        return count;

    }

    /*Function to display the list of numbers*/

    void display (struct node *head)

    {

        while (head != NULL)

        {

            printf("%d", head->number);

            head = head->next;

        }

        printf("\n");

    }

    /*Function to free the allocated list of numbers*/

    void release (struct node **head)

    {

        struct node *temp = *head;

        while ((*head) != NULL)

        {

            (*head) = (*head)->next;

            free(temp);

            temp = *head;

        }

    }