factorial_large_number.c File Reference

Compute factorial of arbitrarily large numbers by storing individual digits in a byte. More...

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

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Data Structures
struct	_large_num
	dynamically large number More...

Typedefs
typedef struct _large_num	large_num
	dynamically large number

Functions
large_num *	new_number (void)
	create a new large number More...
void	delete_number (large_num *num)
	delete all memory allocated for large number More...
void	add_digit (large_num *num, unsigned int value)
	add a digit to the large number More...
void	multiply (large_num *num, unsigned long n)
	multiply large number with another integer and store the result in the same large number
int	main (int argc, char *argv[])
	main function

Detailed Description

Compute factorial of arbitrarily large numbers by storing individual digits in a byte.

Author

Krishna Vedala

Function Documentation

add_digit()

void add_digit	(	large_num *	num,
		unsigned int	value
	)

add a digit to the large number

Parameters

[in,out]	num
[in]	value	value of the digit to insert

{
    if (value > 9)
    {
        fprintf(stderr, "digit > 9!!\n");
        delete_number(num);
        exit(EXIT_FAILURE);
    }
 
    num->num_digits++;
    num->digits = (char *)realloc(num->digits, num->num_digits * sizeof(char));
    num->digits[num->num_digits - 1] = value;
}

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delete_number()

void delete_number

(

large_num *

num

)

delete all memory allocated for large number

Parameters

[in]

num

pointer to large_num to delete

{
    free(num->digits);
    free(num);
}

new_number()

large_num* new_number

(

void

)

create a new large number

Returns

pointer to a large number

{
    large_num *new_num = (large_num *)malloc(sizeof(large_num));
    new_num->num_digits = 1;
    new_num->digits = (char *)malloc(1 * sizeof(char));
    new_num->digits[0] = 1;
    return new_num;
}