fscanf(Temp,"%f",&looker);      /*如果是A,则是操作数*/
   FPush(looker,Operands); 
   Pop(Whereat);
  }
  else if (Top(Whereat) == 'B'){
   fscanf(Temp," ",&spacefinder);     /*如果是B,则是运算符*/
   Op = getc(Temp);      
   switch(Op){       /* 判断是什么运算符*/
   case('^'):                       /*幂运算*/
    NumB = FTop(Operands);
    FPop(Operands);
    if (FIsEmpty(Operands)){   /*错误处理*/
     PrintError = 1;
    }
    else{
     NumA = FTop(Operands);
     FPop(Operands);
     if ((NumA == 0 && NumB < 0)||((NumA<0)
      && (NumB - (int)NumB != 0)))
     {
      PrintError = 1;
     }
     else{
      answer = pow(NumA,NumB);
      FPush(answer,Operands);
     }
    }
    break;
   case '%':                         /*取模运算*/
    NumB = FTop(Operands);
    FPop(Operands);
    if (FIsEmpty(Operands)){  /*错误处理*/
     PrintError = 1;
    }
    else{
     NumA = FTop(Operands);
     FPop(Operands);
     if ((NumA - (int)NumA != 0) || (NumB - (int)NumB != 0)
      || (NumB == 0))
     {
      PrintError = 1;
     }
     else{
      answer = (int)NumA % (int)NumB;   /* x mod b*/
      FPush(answer,Operands);
     }
    }
    break;
   case '*':                                       /*乘法运算*/
    NumB = FTop(Operands);
    FPop(Operands);
    if (FIsEmpty(Operands)){ 
     PrintError = 1;
    }
    else{
     NumA = FTop(Operands);
     FPop(Operands);
     answer = NumA * NumB;      /* x * y*/
     FPush(answer,Operands);
    }
    break;
   case '/':                                        /*除法运算*/
    NumB = FTop(Operands);
    FPop(Operands);
    if (FIsEmpty(Operands)){ 
     PrintError = 1;
&nbs