#define LENGTH 4
#include <stdio.h>
main()
{
   char source[LENGTH];
   int counter;
   void Permute(char[],int,int);
   for(counter=0;counter<LENGTH;counter++){
     source[counter]='a'+counter;
     }
   PERmute(source,LENGTH,0);
   }
void Permute(char source[],int length,int front)
{
   char buffer[LENGTH];
   int counter;
   int number;
   int index;
   if(front==length-1){
       printf("\n");
       for(counter=0;counter<length;counter++){
      printf("%4c",source[counter]);
      }
       }
       else{
        for(number=front;number<length;number++){
           for(counter=0;counter<front;counter++){
          buffer[counter]=source[counter];
        }
        buffer[front]=source[number];
        index=front+1;
        for(counter=front;counter<length;counter++){
             if(counter!=number){
              buffer[index++]=source[counter];
              }

             }
             Permute(buffer,length,front+1);
        }
         }
     }


在TC2.0环境下出现了这样的错误： inker error: undefined symbol '_PERmute' in moldule QPAILIE.C

什么意思啊？ PERMUTE是排列的意思，难道说我的TC2.0缺少东西？

很感谢，能否帮我解释下else{
        for(number=front;number<length;number++){
           for(counter=0;counter<front;counter++){
          buffer[counter]=source[counter];
        }
        buffer[front]=source[number];
        index=front+1;
        for(counter=front;counter<length;counter++){
             if(counter!=number){
              buffer[index++]=source[counter];
              }

             }
             Permute(buffer,length,front+1);
        }
         }
这段。主要index=front+1;之后很迷茫

太感谢了，我认你做师傅吧。我是初学者，但我很感兴趣。