c++ - 收到错误 : ISO C++ forbids declaration of with no type

Question

我收到以下错误:

ISO C++ forbids declaration of ttTreeInsert with no type

ISO C++ forbids declaration of ttTreeDelete with no type

ISO C++ forbids declaration of ttTreePrint with no type

prototype for int ttTree::ttTreePrint() does not match any in class ttTree

candidate is: void ttTree::ttTreePrint()

这是我的头文件:

#ifndef ttTree_h
#define ttTree_h

class ttTree 
{
public:
  ttTree(void);
  int ttTreeInsert(int value);
  int ttTreeDelete(int value);
  void ttTreePrint(void);
  
};

#endif

这是我的 .cpp 文件:

#include "ttTree.h"

ttTree::ttTree(void)
{
  
}

ttTree::ttTreeInsert(int value)
{
}

ttTree::ttTreeDelete(int value)
{
}

ttTree::ttTreePrint(void)
{
}

谁能指出导致这些错误的原因？谢谢!

Answer 1

您忘记了成员函数定义中的返回类型:

int ttTree::ttTreeInsert(int value) { ... }
^^^               

等等。