#include <stdio.h>
//字符串反转(普通)
void inverse(char *p){

   int len = strlen(p);
   int i=0,j=len-1;
   while(i<j){
     char tmp = p[i];
     p[i] = p[j];
     p[j] = tmp;

     i++;
     j--;
   }

}

int main(void){

 char *s="123456789";
 inverse(s);
 printf("%s\n",s);
 return 0;
}


//字符串反转(递归)
#include <stdio.h>
#include <string.h>

void myinverse(char *p,char *dest){

 if(p==NULL || dest == NULL){
    return;
 }

 if(*p==‘\0‘){
   return;
 } 
 myinverse(p+1,dest);
 strncat(dest,p,1);
}

int main(void){

 char *s="123456789";
 char dest[100] = {0}; //这里需要初始化为0;
 myinverse(s,dest);
 printf("%s\n",s);
 return 0;
}