chang.cpp

输入一个字符串

#include <string.h>;
#include <stdio.h>; 
exchange(char *str) 
{ 
   char tmp; 
   int len, i, j; 
   len = strlen(str); 
   for(i = 0, j = len-1; i != len/2; i++, j--) { 
      tmp = str[i]; 
      str[i] = str[j]; 
      str[j] = tmp; 
   } 

return; 
} 

main() 
{ 
   char str[100]; 
   scanf("%s", str); 
   exchange(str); 
   printf("%s\n", str); 
   return; 
}