获取错误：ISO C++ 禁止无类型声明
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Getting error: ISO C++ forbids declaration of with no type
提问by user2264035
I'm getting the following errors:
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()
ISO C++ 禁止声明没有类型的 ttTreeInsert
ISO C++ 禁止声明没有类型的 ttTreeDelete
ISO C++ 禁止声明没有类型的 ttTreePrint
int ttTree::ttTreePrint() 的原型与类 ttTree 中的任何内容都不匹配
候选是：void ttTree::ttTreePrint()
Here is my header file:
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
Here is my .cpp file:
这是我的 .cpp 文件：
#include "ttTree.h"
ttTree::ttTree(void)
{
}
ttTree::ttTreeInsert(int value)
{
}
ttTree::ttTreeDelete(int value)
{
}
ttTree::ttTreePrint(void)
{
}
Can anyone point out what is causing these errors? Thank you!
谁能指出导致这些错误的原因？谢谢！
回答by juanchopanza
You forgot the return types in your member function definitions:
您忘记了成员函数定义中的返回类型：
int ttTree::ttTreeInsert(int value) { ... }
^^^
and so on.
等等。
回答by ap-osd
Your declaration is int ttTreeInsert(int value);
你的声明是 int ttTreeInsert(int value);
However, your definition/implementation is
但是，您的定义/实现是
ttTree::ttTreeInsert(int value)
{
}
Notice that the return type intis missing in the implementation. Instead it should be
请注意，int实现中缺少返回类型。相反应该是
int ttTree::ttTreeInsert(int value)
{
return 1; // or some valid int
}
