未定义的符号c ++问题 [英] undefined symbol c++ problem

问题描述

你好

i dono为什么turbo C会报告此错误。

http： //upcity.ir/images2/15114259861070390340.png [ ^ ]

  #include   <   graphics.h  >  
   #include   <   dos.h  >  
   #include   <   conio.h  >  
  
  void  Drawcar（）{
 setcolor（ 15 ）; 
行（spX [ 1 ]，spY [ 1 ]，spX [ 2 ]，spY [ 2 ]）; 
行（spX [ 2 ]，spY [ 2 ]，spX [ 3 ]，spY [ 3 ]）; 
行（spX [ 3 ]，spY [ 3 ]，spX [ 4 ]，spY [ 4 ]）; 
行（spX [ 4 ]，spY [ 4 ]，spX [ 4 ]，spY [ 4 ]）; 
行（spX [ 1 ]，spY [ 1 ]，spX [ 4 ]，spY [ 4 ]）; 
 pieslice（ 100 ， 400 ， 40 ， 10 ， 25 ）; 
 arc（spX [ 0 ]，spY [ 0 ] =  75  ;,  90 ， 190 ， 30 ）; 
 circle（ 100 ， 400 ， 25 < /跨度>）; 
} 
 
  void  move_sp（ int  a）{
  for （ int  i =  0  ; i< =  20 ; i ++）{
 spX [i] + = a; 
 spY [i] + = a; 
 Drawcar（）; 
} 
 
 
} 
  int  main（）{
  int  g = DETECT，m; 
 initgraph（& g，& m，  c：\\turboc3 \\ BGI）; 
 
  public   int  spX [ 20 ] = { 0 }; 
  public   int  spY [ 20 ] = { 0 }; 
 spX [ 0 ] =  75 ; 
 spY [ 0 ] =  375 ; 
 spX [ 1 ] =  75 ; 
 spY [ 1 ] =  345 ; 
 spX [ 2 ] =  125 ; 
 spY [ 2 ] =  300 ; 
 spX [ 3 ] =  225 ; 
 spY [ 3 ] =  330 ; 
 spX [ 4 ] =  275 ; 
 spY [ 4 ] =  345 ; 
 spX [ 5 ] =  300 ; 
 spY [ 5 ] =  350 ; 
 
 move_sp（ 1 ）; 
 
 
 getch（）; 
 closegraph（）; 
  return   0 ; 
} 

什么是

解决方案

因为DrawCar不是Main函数的一部分！它也不是......



将公共变量移出主方法并进入类的主体。



我不知道为什么Turbo C不会抱怨用户使用public关键字，但这可能是因为它是一个非常古老的编译器...

hello
i dono why turbo C reports this error.
http://upcity.ir/images2/15114259861070390340.png[^]

#include<graphics.h>
#include<dos.h>
#include<conio.h>

void Drawcar(){
setcolor(15);
line(spX[1],spY[1],spX[2],spY[2]);
line(spX[2],spY[2],spX[3],spY[3]);
line(spX[3],spY[3],spX[4],spY[4]);
line(spX[4],spY[4],spX[4],spY[4]);
line(spX[1],spY[1],spX[4],spY[4]);
pieslice(100,400,40,10,25);
arc(spX[0],spY[0]=75;,90,190,30);
circle(100,400,25);
}

void move_sp(int a){
for(int i=0;i<=20;i++){
spX[i]+=a;
spY[i]+=a;
Drawcar();
}


}
int main(){
int g=DETECT,m;
initgraph(&g,&m,"c:\\turboc3\\bgi");

public int spX[20]={0};
public int spY[20]={0};
spX[0]=75;
spY[0]=375;
spX[1]=75;
spY[1]=345;
spX[2]=125;
spY[2]=300;
spX[3]=225;
spY[3]=330;
spX[4]=275;
spY[4]=345;
spX[5]=300;
spY[5]=350;

move_sp(1);


getch();
closegraph();
return 0;
}

what''s

解决方案

Because DrawCar is not a part of the Main function! Nor can it be...

Move your public variables out of the main method and into the main body of the class.

I have no idea why Turbo C isn''t complaining about the user of the "public" keyword on them, but it''s probably because it''s a very old compiler...

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