C ++中的多个定义(Visual Basic 2010)

时间:2015-04-23 06:11:47

标签: c++ visual-studio-2010 multiple-definition-error

我试图在空闲时间练习一些编码(结合我的一些不同的兴趣以帮助自己保持参与)并且我遇到了一个奇怪的错误,我无法找到答案。我有4个我正在使用的文件,两个头文件,一个类定义文件和一个主文件。我相当自信我没有多次包含Dice.h文件(不过这是错误指向的地方,我不再确定,因此这个问题)。我在这里搞砸了什么来产生这些错误?

错误代码

  

错误3错误LNK1169:找到一个或多个多重定义的符号(文件路径已修剪)

     

错误2错误LNK2005:" int __cdecl dice(int,int)" (?骰子@@ YAHHH @ Z)已在Creature.obj中定义(修剪文件路径)

     

文件路径:c:\ Users \ Username \ documents \ visual studio2010 \ Projects \ RPGTest \ RPGTest \ RPGTest。(错误3引用.exe文件,错误2引用.obj文件)。

代码本身:

Dice.h

#ifndef SET_DICE_H_
#define SET_DICE_H_

#include <iomanip>
#include <iostream>
#include <stdlib.h>

using namespace std;

int dice(int number, int sides){

int total=0, dice;
srand(time(NULL));
int results=0;
do {
    dice = rand()%sides+1;
    total+=dice;
    number--;
} while (number > 0);
results = total;
return results;
}
#endif

Creature.h

#ifndef CREATURE_H_
#define CREATURE_H_

#include <iomanip>
#include <iostream>
#include "Dice.h"
using namespace std;

class Creature {
public:
    Creature(int,int,int,int,int,int,int,int,int,int,int,int);
    void set_hp();
    void set_saves();
    void set_ac();
    void set_bab();
    void set_name();
    void update_hp(int);
    void update_ac(int);
    void update_fsave(int);
    void update_rsave(int);
    void update_wsave(int);
    int get_ac();
    int get_hp();
    int get_fsave();
    int get_rsave();
    int get_wsave();
    int get_bonus(int);
    int get_bab();
    string get_name();
private:
    int strength, dexterity, constitution, intellegence, wisdom, charisma;
    int bab, fbsave, rbsave, wbsave;
    int hdnum, hdsize;
    int hp, fsave, rsave, wsave, ac;
    string name;

};
#endif

Creature.cpp

#include "Creature.h"
#include <math.h>
#include <iostream>

using namespace std;

Creature::Creature(int strength,int dexterity,int constitution,
    int intellegence,int wisdom,int charisma,int bab,int fbsave,
    int rbsave,int wbsave,int hdnum,int hdsize){
        strength = strength;
        dexterity = dexterity;
        constitution = constitution;
        intellegence = intellegence;
        wisdom = wisdom;
        charisma = charisma;
        bab = bab;
        fbsave = fbsave;
        rbsave = rbsave;
        wbsave = wbsave;
        hdnum = hdnum;
        hdsize = hdsize;
}

int Creature::get_bonus(int stat){
    int bonus = floor((double(stat)-10)/2);
    return bonus;
}

void Creature::set_ac(){
    ac=10+get_bonus(dexterity);
}

void Creature::set_hp(){
    hp = dice(hdnum,hdsize) + get_bonus(constitution)*hdnum;
}

void Creature::set_saves(){
    fsave = fbsave + get_bonus(constitution);
    rsave = rbsave + get_bonus(dexterity);
    wsave = wbsave + get_bonus(wisdom);
}

void Creature::set_bab(){
    bab = hdnum;
}

void Creature::set_name(){
    cout << "Please enter a name for this creature: ";
    cout << "\nSorry! I don't work yet!";
    cout << "\nInstead all creatures are named Larry!\n";
    name = "Larry!";
}

void Creature::update_hp(int input){
    hp = hp + input;
}

void Creature::update_fsave(int input){
    fsave = fsave+input;
}

void Creature::update_rsave(int input){
    rsave = rsave+input;
}

void Creature::update_wsave(int input){
    wsave = wsave+input;
}

void Creature::update_ac(int input){
    ac = ac+input;
}

int Creature::get_ac(){
    return ac;
}

int Creature::get_hp(){
    return hp;
}

int Creature::get_fsave(){
    return fsave;
}

int Creature::get_rsave(){
    return rsave;
}

int Creature::get_wsave(){
    return wsave;
}

int Creature::get_bab(){
    return bab;
}

RPGTest.cpp

#include "Creature.h"
#include <math.h>
//#include "Dice.h"
#include <iostream>
#include <iomanip>

using namespace std;

int main(){

    int str = dice(3,6), dex = dice(3,6), con = dice(3,6), intel = dice(3,6), wis = dice(3,6), cha = dice(3,6);
    int fbs = dice(1,6), rbs = dice(1,6), wbs = dice(1,6);
    int hdn = dice(1,10), hds = 8, bab = dice(1,8);

    cout << "Welcome to RPG Creature Tester v0.1\n";
    cout << "This .exe file is meant to test the creature class functions and definitions.\n";
    cout << "This will be done by randomly generating and displaying a creature.\n";
    cout << "What you don't see right now is the random generation of a creature.\n";
    cout << "Once it's finished, the \'statsheet\' will be shown.\n";
    cout << "Cheers!\n\n";

    Creature potato (str, dex, con, intel, wis, cha, bab, fbs, rbs, wbs, hdn, hds);

    potato.set_ac();
    potato.set_hp();
    potato.set_name();
    potato.set_saves();

    cout << "OUTPUT BRICK YAY\n";
    cout << "Str: " << str << endl;
    cout << "HP: " << potato.get_hp() << " AC: " << potato.get_ac() << " Fort/Reflex/Will Save: " << potato.get_fsave() << "/" << potato.get_rsave() << "/" << potato.get_wsave();

    return 0;
}

由于我主要是自学成才,我很乐意接受任何其他建议,但我的主要问题是,我不确定为什么我会得到&#34;多个&# 34;定义错误。我对其他类似错误信息的问题进行了一些研究,但我没有看到任何立即跳出来的问题#34;答案&#34;。

全部谢谢!

1 个答案:

答案 0 :(得分:3)

C ++的工作原理是编译单个翻译单元,然后将它们链接在一起。

这意味着每个源文件都是自己编译的。由于#include指令基本上插入了所有包含的代码,因此在您的情况下,您最终会有多个定义的翻译单元

int dice(int number, int sides) {
  ...
}

编译很顺利但是,当链接时,会找到此函数的多个定义,因此会生成错误。

要解决此问题,您有两种方法:

  • 在头文件中声明int dice(int, int),但在源文件中定义(实现它)
  • 保持定义不变,但在其前面添加static。这告诉编译器每个翻译单元将获得自己的dice方法。这个解决方案虽然诱人,但会导致二进制大小增加,因为您将有多个相同方法的实现