输入一串数字 以此加空格输出

//输入一串数字间隔出空格
#include<iostream>
using namespace std;
int main()
{
	int num,num2,k=1,i,a[100];
	cout << "请输入一串数字" << endl;
	cin >> num;
	num2 = num;
	
	while (num >= 10)
	{
		num = num / 10;
		k++;
	} 
	for ( i = 0; i < k; i++)
	{
	
		a[i] = num2 % 10;
		num2 /= 10;
	}
	for (i = k-1; i>=0; i--)
	{
		cout << a[i] << " ";
	}
return 0;
}