C program to create, delete and rename a file.

fileop.c

#include<stdio.h>
#include<process.h>
#include<dos.h>

void main() {
	char loc[50], filename[50], oldname[50], ch;
	int opr, gate = 1;
	long int attr;
	union REGS inreg, outreg;
	clrscr();
	do {
		printf("\nSelect Operation\n");
		printf("\n\t1 - Create a file\n");
		printf("\n\t2 - Delete a file\n");
		printf("\n\t3 - Rename a file\n");
		scanf("%i", &opr);
		switch(opr) {
			case 1:
				printf("\nCreate a file\n");
				printf("\nEnter location : ");
				scanf("%s", loc);
				inreg.h.ah = 0x3B;
				inreg.x.dx = (int)loc;
				int86(0x21, &inreg, &outreg);
				printf("\nEnter file name : ");
				scanf("%s", filename);
				printf("\nEnter file attributes : ");
				scanf("%i", &attr);
				inreg.h.ah = 0x3C;
				inreg.x.dx = (int)filename;
				inreg.x.cx = (long)attr;
				int86(0x21, &inreg, &outreg);
				if (outreg.x.cflag == 0)
					printf("\nFile Created\n");
				else
					printf("\nError Creating file\n");
				break;
			case 2:
				printf("\nDelete a file\n");
				printf("\nEnter location : ");
				scanf("%s", loc);
				inreg.h.ah = 0x3B;
				inreg.x.dx = (int)loc;
				int86(0x21, &inreg, &outreg);
				printf("\nEnter file name : ");
				scanf("%s", filename);
				inreg.h.ah = 0x41;
				inreg.x.dx = (int)filename;
				int86(0x21, &inreg, &outreg);
				if (outreg.x.cflag == 0)
				  printf("\nFile Deleted\n");
				else
					printf("\nError deleting file\n");
				break;
			case 3:
				printf("\nRename a file\n");
				printf("\nEnter location : ");
				fflush(stdin);
				scanf("%s", loc);
				fflush(stdin);
				inreg.h.ah = 0x3B;
				inreg.x.dx = (int)loc;
				int86(0x21, &inreg, &outreg);
				printf("\nEnter old name : ");
				scanf("%c", ch);

				printf("%s", oldname);
				fflush(stdin);
				printf("\nEnter new name : ");
				scanf("%s", filename);
				inreg.h.ah = 0x56;
				inreg.x.dx = (int)oldname;
				inreg.x.di = (int)filename;
				int86(0x21, &inreg, &outreg);
				if (outreg.x.cflag == 0)
					printf("\nFile Renamed\n");
				else 
					printf("\nError renaming file\n");
				break;
			default:
				printf("\nInvalid Operation\n");
		}
		printf("\nDo you want to continue 1 / 0 : ");
		scanf("%i", &gate);
	}while(gate);
	getch();
}