Description
Write a function, input a four-digit number, and ask to output these four numeric characters, but there is a space between every two numbers. If you enter 1990, it should output "1 9 9 0".
Input
A four-digit number
Output
Increase space output
Sample Input
1990
Sample Output
1 9 9 0
The specific code is as follows: The
key is to understand the specific operation process of recursion clearly
#include<stdio.h>
void change(int a);
int main()
{
int a;
scanf("%d",&a);
change(a);
return 0;
}
void change(int a)
{
if(a>9) //注意此处递归终止的条件
change(a/10);
printf("%d ",a%10);
}