字符逆序输出的程序

#include <stdio.h>
void main()
{char *nixu(char*qian);
 char shuzu[1000];
 gets(shuzu);
 char *shuzu1=shuzu;
 while(*shuzu1!='\0'){
 if(((*shuzu1)>='a'&&(*shuzu1)<='z')||((*shuzu1)>='A'&&(*shuzu1)<='Z'))shuzu1=nixu(shuzu1); 
else shuzu1++;  
 



}
printf("%s\n",shuzu);

}
 
char *nixu(char*qian)
{   char*cheng=qian;
char *hou=qian;int i=0; char temp;
while((*qian)>='a'&&(*qian)<='z'||((*qian)>='A'&&(*hou)<='Z')){
       i++;
   qian++;
     
}
qian=qian-1;
   // printf("%d",i);
for(int num=0;num<i/2;num++){temp=*qian; *qian=*hou;*hou=temp;qian--;hou++;}
//for(int p=0;p<4;p++){printf("%c",*cheng);cheng++;}