zegulas
Traceur
- Joined
- Oct 1, 2003
- Messages
- 303
I am trying to make a program which will accept the names and cordinates of the points to be plotted and then plot the points, its a graphics program in C language but sometimes the name given are not displayed properly (sometimes shows NULL or weird characters).
Code:
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <graphics.h>
#include <string.h>
int main()
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode, *vrt_x,*vrt_y,i,v;
char** vrt_name;
clrscr();
/* initialize graphics and local variables */
initgraph(&gdriver, &gmode, "C:\\TC\\BGI");
/* read result of initialization */
errorcode = graphresult();
if (errorcode != grOk) /* an error occurred */
{
printf("Graphics error: %s\n", grapherrormsg(errorcode));
printf("Press any key to halt:");
getch();
exit(1); /* terminate with an error code */
}
/*~~~~~~~~~Let the Plotting Begin!!!~~~~~~~~~~*/
/* Asking for Vertices */
printf(" How many vertices are there? ");
scanf("%d",&v);
vrt_x =(int*)calloc(v,sizeof(int)); /* Initialized after accepting Vertices to determine */
vrt_y =(int*)calloc(v,sizeof(int)); /* the size of memory to be alocated */
vrt_name =(char**)calloc(v,sizeof(char));
if(vrt_x!=NULL && vrt_y!=NULL && vrt_name!=NULL)
{
for(i=0; i<v ; i++)
{
printf("\n Enter a name for vertice number %d ",i);
scanf("%s",vrt_name[i]);
}
for(i=0; i<v ; i++)
{
printf("\n Enter only the x co-ordinates for %s vertice : ",vrt_name[i]);
scanf("%d",&vrt_x[i]);
}
for(i=0 ; i<v ; i++)
{
printf("\n Enter only the y co-ordinates for %s vertice: ",vrt_name[i]);
scanf("%d",&vrt_y[i]);
}
clrscr();
/* For plotting points */
for(i=0;i<v;i++)
{
setbkcolor(0);
fillellipse(vrt_x[i],vrt_y[i],2,2);
outtextxy(vrt_x[i],vrt_y[i]-10,vrt_name[i]);
}
/* Adjancey Matrix */
getch();
return 0;
}
else
{
printf("Not enough memory\n");
return 1;
}
}