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incompatible implicit declaration of built-in function 'ceil'
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#include <stdio.h>

void main()
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#include <stdio.h>
#include <graphics.h>
void main()
{
  int x0,y0,x1,y1,driver,mode,i;
  driver=VGA;
  mode=VGAHI;
  initgraph(&driver,&mode,&qu ......

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#include <stdlib.h>

int main(void)
{
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