Question

我尝试为线路创建构造函数，但我仍然遇到此错误，即使这在poolball类上运行并且能够在添加line.cpp和line.h之前运行。此外，这是来自类的代码，我不知道它为什么不编译。

#include "Line.h"
Line::Line(){
}

Line::Line( int x1, int y1, int x2, int y2){
}

void Line::setPos(int x1, int y1, int x2, int y2){
}

void Line::draw( void ){
}

-------------------------------------------------------------------------
#pragma once

class Line{
public:
    int x1;
    int y1;
    int x2, y2;

    //constructor
    Line();
    Line( int x1, int y1, int x2, int y2);
    //methods
    void setPos(int x1, int y1, int x2, int y2);
    void draw( void);

这是我在尝试构建和运行时遇到的错误

||=== Build: Debug in 10.19class (compiler: GNU GCC Compiler) ===|
C:\Users\Admin\Desktop\C++Projects\10.19class\Line.cpp|2|error: extra     qualification 'Line::' on member 'Line' [-fpermissive]|
C:\Users\Admin\Desktop\C++Projects\10.19class\Line.cpp|2|error: 'Line::Line()' cannot be overloaded|
C:\Users\Admin\Desktop\C++Projects\10.19class\Line.h|10|error: with 'Line::Line()'|
C:\Users\Admin\Desktop\C++Projects\10.19class\Line.cpp|5|error: extra qualification 'Line::' on member 'Line' [-fpermissive]|
C:\Users\Admin\Desktop\C++Projects\10.19class\Line.cpp|5|error: 'Line::Line(int, int, int, int)' cannot be overloaded|
C:\Users\Admin\Desktop\C++Projects\10.19class\Line.h|11|error: with 'Line::Line(int, int, int, int)'|
C:\Users\Admin\Desktop\C++Projects\10.19class\Line.cpp|9|error: extra qualification 'Line::' on member 'setPos' [-fpermissive]|
C:\Users\Admin\Desktop\C++Projects\10.19class\Line.cpp|9|error: 'void Line::setPos(int, int, int, int)' cannot be overloaded|
C:\Users\Admin\Desktop\C++Projects\10.19class\Line.h|13|error: with 'void Line::setPos(int, int, int, int)'|
C:\Users\Admin\Desktop\C++Projects\10.19class\Line.cpp|12|error: extra qualification 'Line::' on member 'draw' [-fpermissive]|
C:\Users\Admin\Desktop\C++Projects\10.19class\Line.cpp|12|error: 'void Line::draw()' cannot be overloaded|
C:\Users\Admin\Desktop\C++Projects\10.19class\Line.h|14|error: with 'void Line::draw()'|
C:\Users\Admin\Desktop\C++Projects\10.19class\Line.cpp|13|error: expected '}' at end of input|
C:\Users\Admin\Desktop\C++Projects\10.19class\Line.cpp||In constructor 'Line::Line(int, int, int, int)':|
C:\Users\Admin\Desktop\C++Projects\10.19class\Line.cpp|6|error: 'cout' is  not a member of 'std'|
C:\Users\Admin\Desktop\C++Projects\10.19class\Line.cpp|6|error: 'endl' was not declared in this scope|
C:\Users\Admin\Desktop\C++Projects\10.19class\Line.cpp|13|error: expected unqualified-id at end of input|
||=== Build failed: 16 error(s), 0 warning(s) (0 minute(s), 0 second(s))   ===|

Answer 1

void Line(void)不正确，构造函数没有返回类型，在参数列表中也不应该写void。

Answer 2

根据错误消息判断，并假设破折号下方的内容是您的头文件的完整内容，那么您的问题是您在头文件的末尾缺少someService.arrayVal。您需要在标题中使用小括号和分号关闭类定义，然后才能在Line.cpp文件中实现这些函数。

代码块C ++类构造函数错误

2 个答案: