#include <stdlib.h>
#include <math.h>
#include <conio.h>
#include <graphics.h>
void main()
{
  struct student {
    char na[10];
    int x,y;
    float avg;
  } a[5]= { { "a111", 80, 89, 85.0 }, { "a222", 80, 89, 87.0 },
	    { "a333", 80, 89, 89.0 }, { "a444", 80, 89, 85.0 },
	    { "a555", 80, 89, 85.0 },
	  };
  int i,j,n,IND[5]={ 0,1,2,3,4 };

 clrscr();
 printf("before sort !!!\n");
 for (i=0; i<=4; i++)
  printf("%s  %2d  %2d  %4f\n",a[i].na,a[i].x,a[i].y,a[i].avg);

  for (i=0; i<=4; i++)
    for (j=i+1; j<=4; j++)
      if (a[IND[i]].avg < a[IND[j]].avg) {
	n=IND[i];
	IND[i]=IND[j];
	IND[j]=n;
      }

 printf("after sort !!!\n");
 for (i=0; i<=4; i++)
  printf("%s  %2d  %2d  %4f\n",a[IND[i]].na,
     a[IND[i]].x,a[IND[i]].y,a[IND[i]].avg);

}