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

void factor(int n , int i ){
	int count = 0;
	
	if(n==i) {
		printf(" x %d",i);
		return;
	}
	
	if(n<=1) return;
	
	while (n % i ==0){
		count++;
		n /= i;
	} 
	
	if(count>1 ) printf(" x %d^%d",i,count);
	else if (count==1 ) printf(" x %d",i);
	
	factor(n , i+1);
}

int main(){
	int i= 2 , n ;
	printf("輸入一個正整數並進行因式分解\n");
	printf("輸入數字 ==> ");
	scanf("%d",&n);
	if(n==2) {
		printf("\n%d = 1 x 2",n);
	}else{
		printf("\n%d = 1",n);
	} 
	
	factor(n,i);
	
	printf("\n");
	system("pause");	
	
	return 0;
}