输入一个四位数(正整数),将各位数字分开,并按其反序输出.如输入3456,则输出6543,要求用递归函数实现.
#include <iostream.h>
void f(int n)
{
____________________;//输出
if(n/10)
____________________;//递归调用
}
void main()
{
int x,num;
cout < < "input a number: ";
cin> > x;
cout < < "the new number is: ";
f(x);
cout < <endl;
}