factors using recursion

1/* C Program to print prime factors*/
2 
3 
4#include<stdio.h>
5void PFactors( int num);
6void IPFactors( int n);
7 
8int main( )
9{
10	int num;
11	printf("Enter a number : ");
12	scanf("%d", &num);
13	printf("\nUsing Recursion :: \n");
14	PFactors(num);
15	printf("\n");
16	printf("\nUsing Iteration :: \n");
17	IPFactors(num);
18	printf("\n");
19 
20	return 0;
21 
22}/*End of main()*/
23 
24/*Recursive*/
25 
26void PFactors( int num)
27{
28	int i = 2;
29	if( num == 1 )
30		return;
31	while( num%i != 0 )
32		i++;
33	printf("%d ", i);
34	PFactors(num/i);
35}/*End of PFactors()*/
36 
37/*Iterative*/
38void IPFactors( int num)
39{
40	int i;
41	for( i = 2; num!=1; i++)
42		while( num%i == 0 )
43		{
44			printf("%d ", i);
45			num = num/i;
46		}
47}/*End of IPFactors()*/
48