Program To Allow The User To Insert Or Delete The Contents Of Array Using Interactive Iterations

/* Program To Allow The User To Insert Or Delete The Contents
		    Of Array Using Interactive Iterations           */
		 #include<stdio.h>
		 #include<conio.h>
		 
		 void main()
		 {	int num[20];
		 	int i,j,sz,n;
		 	char ch,op;
		 	clrscr();
		 	printf("\n enter no.of values(max.20)\n");
		 	scanf("%d",& sz);
		 	for( i=0;i<sz;i++ )
		 	 { printf("\n enter value: %d\n",i+1);
		 	   scanf("%d",&num[i]);
		 	 }
		 	do
		 	 { printf("\n enter (i)nsert,(d)elete,(l)ist\n");
		 	   fflush(stdin);
		 	   ch= getchar();
		 	   switch(ch)
		 	   { case 'i': printf("enter value and position");
		 		       scanf("%d\n%d",&n,&j);
		 		       if(sz==20)
		 			{ printf("\n array exceeding upper limit\n");
		 			  break;
		 			}
		 		       for( i=sz;i>=j;i-- )
		 			   num[i]=num[i-1];
		 			sz++;
		 			break;
		 	     case 'd': printf("\n enter element position\n");
		 		       scanf("%d",&j);
		 		       if(sz==0)
		 			{ printf("\n array is empty");
		 			  break;
		 			}
		 		       for( i=j-1;i<sz;i++ )
		 			    num[i]=num[i+1];
		 			 sz--;
		 			 break;
		 
		 	     case 'l': for( i=0;i<sz;i++ )
		 			  printf("\n %d",num[i]);
		 			break;
		 	     default :     printf("\n invalid option");
		 			break;
		 	   }
		 	    printf("\n enter y or Y to continue...\n");
		 	    op= getchar();
		 	 }
		 	 while(op=='y' || op=='Y');
		 	getch();
}

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