restorecrtmode example in c


Header file:
    graphics.h

Synopsis:
      void restorecrtmode();
    
Description:
     restorecrtmode() restores screen mode to text mode.

restorecrtmode function in c graphics

  #include <graphics.h>
  #include <stdlib.h>
  #include <stdio.h>
  #include <conio.h>

  int main(void) {
        /* request auto detection */
        int gd = DETECT, gmode, err;
        int midx, midy;

        /* initialize graphics and local variables */
        initgraph(&gd, &gmode, "C:/TURBOC3/BGI");

        /* read result of initialization */
        err = graphresult();

        if (err != grOk) {
                /* an error occurred */
                printf("Graphics error: %s\n", grapherrormsg(err));
                getch();
                return 0;
        }

        /* mid position in x and y-axis */
        midx = getmaxx() / 2;
        midy = getmaxy() / 2;

        /* output a message */
        settextjustify(CENTER_TEXT, CENTER_TEXT);
        outtextxy(midx, midy - 100, "GRAPHICS MODE");

        /* draw a rectange at the given position */
        rectangle(midx - 50, midy - 50, midx + 50, midy + 50);
        getch();

        /* restore system to text mode */
        restorecrtmode();
        printf("Restored system to text mode");
        getch();

        /* return to graphics mode */
        setgraphmode(getgraphmode());

        /* output a message */
        settextjustify(CENTER_TEXT, CENTER_TEXT);
        outtextxy(midx, midy - 100, "BACK TO GRAPHIC MODE!!");

        /* draws a rectangle at the given postion */
        rectangle(midx - 50, midy - 50, midx + 50, midy + 50);

        /* clean up */
        getch();
        closegraph();
        return 0;
  }

Comments

Post a Comment

Popular posts from this blog

Difference between asterisk and ampersand operators in c

Address Operator (& - Ampersand): Returns address of the given variable.  Consider the following example, int *ptr, var = 10; ptr = &var; ptr = &var sets the address of the variable var to pointer ptr.  & is also called as reference operator. Let us try to understand the purpose of reference operator using the following example program.   #include <stdio.h>   int main() {         int var = 10, *ptr;         /* assigning address of variable var to pointer ptr */         ptr = &var;         /* printing the address of the variable var */         printf("Address of var is 0x%x\n", &var);         /* printing the value of pointer ptr */         printf("Value of ptr is 0x%x\n", ptr);         return 0;   }   Output:   jp@jp-VirtualBox:~/$ ./a.out   Address of var is 0xbfdf202c   Value of ptr is 0xbfdf202c Indirection Operator('*' - asterisk): The dereference operator is an unary operator which returns the value of
Read more

kbhit in c

kbhit in c: kbhit function is used to determine if a key has been pressed or not. To use kbhit function in your program you should include the header file "conio.h". If a key has been pressed then it returns a non zero value otherwise returns zero. Declaration : int kbhit(); C programming code for kbhit #include <stdio.h> #include <conio.h> main() {    while (!kbhit())       printf("You haven't pressed a key.\n");    return 0; } As long as in the above program user doesn't presses a key kbhit() return zero and (!0) i.e. 1 the condition in while loop is true and "You haven't pressed a key." will be printed again and again. As a key is pressed from the keyboard the condition in while loop become false as now kbhit() will return a non-zero value and ( !(non-zero) = 0), so the control will come out of the while loop.
Read more