Question

Helo，我正在尝试使用g ++在Ubuntu中编译我的c ++代码。

我有3个文件：Ball.h Ball.cpp main.cpp

头文件Ball.h

#ifdef BALL_H_
#define BALL_H_
class Ball {

public:
Ball();
Ball(int radius);
~Ball();

void setRadius(int);
int getRadius();

private:

int radius;


};

#endif //BALL_H_

Ball.cpp文件

#include "Ball.h"

Ball::Ball() {

radius = 1;

}

Ball::Ball(int rad) {

radius = rad;

}

Ball::~Ball() {

}

void Ball::setRadius(int rad) {

radius = rad;

}

int Ball::getRadius() {

return radius;

}

main.cpp文件

#include <iostream>
#include "Ball.h"


using namespace std;

int main() {

//Ball b, b2, b3(2);

Ball b = Ball();
Ball b2 = Ball();
Ball b3 = Ball(2);

cout << "Initial radius: ";
    <<b.getRadius() << endl;

b.setRadius(10);

cout << "New radius: "
    << b.getRadius() << endl;

cout << "Initial radius b2: "
    << b2.getRadius() << endl;

b2.setRadius(20);

cout << "b/b2"
    << b.getRadius() << "/"
    << b2.getRadius() << endl;


cout <<"b3 radius: "
    << b3.getRadius() << endl;  
return 0;

}

当我试图编译所有这3个文件时，编译器甚至找不到在main.cpp中声明的Ball对象我正在使用makefile来编译这3个文件。

Makefile：

GPP=g++
GPPOPT=-std=c++11

OBJ=Ball main

all: $(OBJ)

Ball:
$(GPP) $(GPPOPT) -c Ball.cpp -o $@

main:
$(GPP) $(GPPOPT) main.cpp -o $@


 clean: 
-$(RM) $(OBJ)

Compilator消息：

m4r1us@ubuntu:~/Desktop/cpptest$ make
g++ -std=c++11 -c Ball.cpp -o Ball
Ball.cpp:3:2: error: ‘Ball’ does not name a type
Ball::Ball() {
^
Ball.cpp:9:2: error: ‘Ball’ does not name a type
Ball::Ball(int rad) {
^
Ball.cpp:15:2: error: ‘Ball’ does not name a type
Ball::~Ball() {
^
Ball.cpp:19:7: error: ‘Ball’ has not been declared
void Ball::setRadius(int rad) {
     ^
Ball.cpp: In function ‘void setRadius(int)’:
Ball.cpp:21:2: error: ‘radius’ was not declared in this scope
radius = rad;
 ^
Ball.cpp: At global scope:
Ball.cpp:25:6: error: ‘Ball’ has not been declared
int Ball::getRadius() {
     ^
Ball.cpp: In function ‘int getRadius()’:
Ball.cpp:27:9: error: ‘radius’ was not declared in this scope
return radius;
        ^
make: *** [Ball] Error 1
m4r1us@ubuntu:~/Desktop/cpptest$

我认为编译存在一些问题。我无法弄清楚我做错了什么。有什么提示吗？

谢谢。

Answer 1

检查你的头部防护装置。如果#ifdef BALL_H_，则#ifndef BALL_H_为{{1}}。

c ++代码不会编译

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