Question

8. (15 marks) Write a complete C program, which uses an array of structures and two user defined functions. The program deals with a library database. The program will ask the user to input required information about each book and store it in a structure in a user defined function called get info. The second user defined function display_info will display database information on the screen. The output should look as follows: Book Title Book ld 123456 C Programming 10 234561 345612 Java Quantity 20 The get_info function must ask the user "how many books to enter" and then input that number of books into the array and return to main. The display info function displays all of the books from the array. The array of structures (created in main) must be passed to both functions (other parameters may also be required). Both functions must be called from main (i.e, do not call one function from the other). Use pointer notation to access elements of the array in the get info function and array notation in the display_info function. Assume that the book name is no longer than 30 characters and the size of the database is up to 200 books Bonus: (2 marks) In the end of main) store the database to a file called library.txt

Answer 1

#include<dos.h>

#include<graphics.h>

  

  

union REGS i,o;

main()

{

int gd=DETECT,gm,maxx,maxy,x,y,button;

initgraph(&gd,&gm,"c:\\turboc3\\bgi");

maxx=getmaxx();

maxy=getmaxy();

rectangle(0,56,maxx,maxy);

setviewport(1,57,maxx-1,maxy-1,1);

gotoxy(26,1);

printf("MouseDemostration program");

if(initmouse()==0)

{

closegraph();

restorecrtmode();

printf("\n mouse driver not loaded");

exit(1);

  

}

restrictmouseptr(1,57,maxx-1,maxy-1);

showmouseptr();

gotoxy(1,2);

printf("Left button");

gotoxy(15,2);

printf("Right button");

gotoxy(55,3);

printf("press anaykey to exit");

while(!kbhit())

{

getmousepos(&button,&x,&y);

gotoxy(5,3);

(button&1)==1?printf("down"):printf("up");

gotoxy();

(button&2)==2?printf("Down"):printf("Up");

gotoxy(65,2);

printf("X=%03d y=%03d",x,y );

}

return;

}

initmouse()

{

i.x.ax=0;

int86(0x33,&i,&o);

return(o.x.ax);

}

showmouseptr()

{

i.x.ax=1;

int86(0x33,&i,&o);

return;

}

  

restrictmouseptr(int x1,int y1,int x2,int y2)

{

i.x.ax=7;

i.x.cx=x1;

i.x.dx=x2;

int86(0x33,&i,&o);

i.x.ax=8;

i.x.cx=y1;

i.x.dx=y2;

int86(0x33,&i,&o);

return;

}

getmousepos(int *button,int *x,int *y)

{

i.x.ax=3;

int86(0x33,&i,&o);

*button=o.x.bx;

*x=o.x.cx;

*y=o.x.dx;

return;

}