bubblesort and swap

 void swap(struct students *xp, struct students *yp)
{
    struct students temp = *xp;
    *xp = *yp;
    *yp = temp;
}

/* Bubblesort*/
void bubblesort(struct students *x, int n)
{
   int i, j;
   for (i = 0; i < n-1; i++){
       for (j = 0; j < n-i-1; j++){
           if (x[j].grade > x[j+1].grade){
              swap(&x[j], &x[j+1]);}
              if (x[j].grade==x[j-1].grade){
                if (x[j-1].am>x[j].am)
                 swap(&x[j-1],&x[j]);
              }
      }
   }
 }