字符串打印 采用递归方式~

#include "iostream"

using namespace std;

#define  MAX 20

char str[MAX];

//打印字符串

void printf_str(char* str,int order);

int main(void)

{

fgets(str,MAX,stdin);

//cout<<str<<endl;

printf_str(str,0);

return 0;

}

/*

str  ;//字符数组

order = 0;正序打印

order = 1;倒序打印

*/

void printf_str(char* str,int order)

{

int len; 

if (str == NULL)

{

return;

}

len = strlen(str);

if (len == 1)

{

return;

}

if (len == 2)

{

cout<<str[0]<<endl;

}

else

{

if (!order)     //0正序

{     

cout<<str[0]<<endl;

}

printf_str(str + 1,order);

 

if (order)

{        //1倒序

  cout<<str[0]<<endl;

}

}

return;

}