问题补充：

我设计了一个程序，原来编译的好好的，后来加了个段代码，觉得不合适删了之后就编译错误了，错误信息：

[Error] ld returned 1 exit status

这是源代码，/* 后为加上内容

#include<iostream>

#include<stdlib.h>

#include<unistd.h>

#include<cstdio>

#include<cmath>

using namespace std;

double player_healthy=20;//定义玩家属性

int player_attack=2;

int player_denfense=0;

int player_tougness=0;

int player_rank=0;

int player_level=0;

char F3[17][67];//用来生成战场

char key;//用来存储行为

int x=2,y=2;//定义玩家坐标

void space()//将战场填充满空格

{

for(int i=1;i<=17;i++)

{

for(int j=1;j<=67;j++)

{

F3[i][j]=' ';

}

}

return ;

}

void place1()//定义一号战场

{

for(int i=1;i<=67;i++)

{

F3[1][i]='-';

F3[17][i]='-';

}

for(int j=2;j<=17;j++)

{

F3[j][1]='|';

F3[j][67]='|';

}

return ;

}

void place2()//定义二号战场

{

for(int i=1;i<=67;i++)

{

F3[1][i]='-';

F3[17][i]='-';

}

for(int j=2;j<=17;j++)

{

F3[j][1]='|';

F3[j][67]='|';

}

for(int n=21;n<=47;n++)

{

F3[6][n]='-';

F3[12][n]='-';

}

for(int m=7;m<=11;m++)

{

F3[m][21]='|';

F3[m][47]='|';

}

F3[6][34]=' ';

F3[12][34]=' ';

F3[9][21]=' ';

F3[9][47]=' ';

return ;

}

void good_things()//定义随机奖励

{

int F3_i;

int F3_j;

static int x1=F3_i,y1=F3_j;

F3_i=rand()%27+1;

F3_j=rand()%37+1;

int thing=rand()%3+1;

if(thing==1)

{

F3[F3_i][F3_j]='H';

}

else

{

thing-=1;

F3[F3_i][F3_j]=(thing==2)?'A':'D';

}

return ;

}

void sword1()//定义剑士

{

int F3_i;

int F3_j;

static int x2=F3_i,y2=F3_j;

F3_i=rand()%27+1;

F3_j=rand()%37+1;

F3[F3_i][F3_j]='a';

return ;

}

void sword2()

{

int F3_i;

int F3_j;

static int x3=F3_i,y3=F3_j;

F3_i=rand()%25+1;

F3_j=rand()%35+1;

static double sword2_healthy=rand()%9+12;

static int sword2_attack=rand()%6+1;

static int sword2_denfense=rand()%8;

static int sword2_tougness=rand()%5;

static int sword2_rank=rand()%11+13;

F3[F3_i][F3_j]='b';

return ;

}

void sword3()

{

int F3_i;

int F3_j;

static int x4=F3_i,y4=F3_j;

F3_i=rand()%20+1;

F3_j=rand()%30+1;

static double sword3_healthy=rand()%12+12;

static int sword3_attack=rand()%6+3;

static int sword3_denfense=rand()%12;

static int sword3_tougness=rand()%6+1;

static int sword3_rank=rand()%21+17;

F3[F3_i][F3_j]='c';

return ;

}

void bow()//定义弓箭手

{

int F3_i;

int F3_j;

static int x5=F3_i,y5=F3_j;

F3_i=rand()%17+1;

F3_j=rand()%27+1;

static double bow_healthy=rand()%15+10;

static int bow_attack=rand()%6+4;

static int bow_denfense=rand()%15;

static int bow_tougness=rand()%7+2;

static int bow_rank=rand()%36+23;

F3[F3_i][F3_j]='a';

return ;

}

void player()//定义玩家坐标

{

F3[x][y]='@';

return ;

}

void output()//用来输出战场

{

/*srand(0);

int places=rand()%2;//用来随机分布战场，有趣的是，二战场怪物可能暂时占据墙壁的位置

space();

loop:

cout<<places<<endl;

sleep(5);

//*注：loop为我测试rand时的临时代码

(places==0)? place1():place2();

system("cls");//清屏

for(int i=1;i<=17;i++)

{

for(int j=1;j<=67;j++)

{

cout<<F3[i][j];

}

cout<<endl;

}

return;

}

int main()

{

player();

output();

cin>>key;

int perhaps=rand()%10;//用来随机选择行为方，玩家70%，敌人30%

perhaps=(perhaps<=6)?0:1;

switch(key)

{

case 119:if(y-1!=' ')//向上移动

{

player_healthy+=0.5;

}

else

{

F3[x][y]=' ';

y-=1;

F3[x][y]='@';

}

break;

case 97:break;

case 115:break;

case 100:x=1;

}

}

求大神朋友指点怎么修改，再给一点建议

补充：编译器：TDM-GCC 4.9.2 32-bit Release版本:Dev-Cpp.5.11