Some Good Question Of C Language

  COLORS (text mode)

 ====================|Back-|Fore-

  Constant     |Value|grnd?|grnd?

 --------------+-----+-----+-----

  BLACK        |  0  | Yes | Yes

  BLUE         |  1  | Yes | Yes

  GREEN        |  2  | Yes | Yes

  CYAN         |  3  | Yes | Yes

  RED          |  4  | Yes | Yes

  MAGENTA      |  5  | Yes | Yes

  BROWN        |  6  | Yes | Yes

  LIGHTGRAY    |  7  | Yes | Yes

  DARKGRAY     |  8  | No  | Yes

  LIGHTBLUE    |  9  | No  | Yes

  LIGHTGREEN   | 10  | No  | Yes

  LIGHTCYAN    | 11  | No  | Yes

  LIGHTRED     | 12  | No  | Yes

  LIGHTMAGENTA | 13  | No  | Yes

  YELLOW       | 14  | No  | Yes

  WHITE        | 15  | No  | Yes

-----

#include <conio.h>

 int main(void)

 {

    clrscr();

    cprintf("INSLINE inserts an empty line in the text window\r\n");

    cprintf("at the cursor position using the current text\r\n");

    cprintf("background color.  All lines below the empty one\r\n");

    cprintf("move down one line and the bottom line scrolls\r\n");

    cprintf("off the bottom of the window.\r\n");

    cprintf("\r\nPress any key to continue:");

    gotoxy(1, 3);

    getch();

    insline();

    getch();

    return 0;

 }

------

 #include <conio.h>

 int main(void)

 {

    cprintf("Press any key to continue:");

    while (!kbhit()) /* do nothing */ ;

    cprintf("\r\nA key was pressed...\r\n");

    return 0;

 }

--------

#include <conio.h>

 #include <string.h>

 int main(void)

 {

    char *str = "This is a test string";

    clrscr();

    cputs(str);

    getch();

    movetext(1, 1, strlen(str), 2, 10, 10);

    getch();

    return 0;

 }

-----

 #include <stdio.h>

 #include <conio.h>

 int main(void)

 {

    char ch = 0;

    printf("Input a string:");

    while ((ch != '\r'))

    {

       ch = getch();

       putch(ch);

    }

    return 0;

 }

----------

 #include <conio.h>

 int main(void)

 {

    /* Display the normal cursor */

    cprintf("\n\rNormal Cursor: "); getch();

    /* Turn off the cursor */

    _setcursortype(_NOCURSOR);

    cprintf("\n\rNo Cursor    : "); getch();

    /* Switch to a solid cursor */

    _setcursortype(_SOLIDCURSOR);

    cprintf("\n\rSolid Cursor : "); getch();

    /* Switch back to the normal cursor */

    _setcursortype(_NORMALCURSOR);

    cprintf("\n\rNormal Cursor: "); getch();

    return 0;

 }

------------

 #include <conio.h>

 int main(void)

 {

    int i;

    clrscr();

    for (i=0; i<9; i++)

    {

        textattr(i + ((i+1) << 4));

        cprintf("This is a test\r\n");

    }

    return 0;

 }

---------------

 #include <conio.h>

 int main(void)

 {

    textmode(BW40);

    cprintf("ABC");

    getch();

    textmode(C40);

    cprintf("ABC");

    getch();

    textmode(BW80);

    cprintf("ABC");

    getch();

    textmode(C80);

    cprintf("ABC");

    getch();

    textmode(MONO);

    cprintf("ABC");

    getch();

    return 0;

 }

-------------

 #include <conio.h>

 int main(void)

 {

    clrscr();

    gotoxy(10,10);

    cprintf("Current location is X: %d  Y: %d\r\n", wherex(), wherey());

    getch();

    return 0;

 }

----------The bitwise operators

Operator

Name

Description

a&b

and

1 if both bits are 1. 3 & 5 is 1.

a|b

or

1 if either bit is 1. 3 | 5 is 7.

a^b

xor

1 if both bits are different. 3 ^ 5 is 6.

~a

not

This unary operator inverts the bits. If ints are stored as 32-bit integers, ~3 is 11111111111111111111111111111100.

n<<p

left shift

shifts the bits of n left p positions. Zero bits are shifted into the low-order positions. 3 << 2 is 12.

n>>p

right shift

shifts the bits of n right p positions. If n is a 2's complement signed number, the sign bit is shifted into the high-order positions. 5 >> 2 is 1.

----------

------------- Add two number without using arthi. op

#include <stdio.h>

      int add(int a, int b){

            if (!a) return b;

            else

                 return add((a & b) << 1, a ^ b);

      }

      int main(){

      int a,b;

          printf("Enter the two numbers: \n");

            scanf("%d",&a);

            scanf("%d",&b);

            printf("Sum is: %d",add(a,b));

      }

--------------------

#include <iostream.h>

#include <conio.h>

int main()

{

cout << "Bit-operators example\nBy Sean Patrick Kane\nhttp://celtickane.com\n\n";

//AND operator

cout << "****AND(&)****\n";

cout << "*..A..B..A&B.*\n";

cout << "* 1 0 " << (1 & 0) << " *\n";

cout << "* 0 1 " << (0 & 1) << " *\n";

cout << "* 0 0 " << (0 & 0) << " *\n";

cout << "* 1 1 " << (1 & 1) << " *\n";

cout << "**************\n";

cout << "Hit any key to continue...\n";

getch();

//OR operator

cout << "\n****OR (|)****\n";

cout << "*..A..B..A|B.*\n";

cout << "* 1 0 " << (1 | 0) << " *\n";

cout << "* 0 1 " << (0 | 1) << " *\n";

cout << "* 0 0 " << (0 | 0) << " *\n";

cout << "* 1 1 " << (1 | 1) << " *\n";

cout << "**************\n";

cout << "Hit any key to continue...\n";

getch();

//XOR operator

cout << "\n****XOR(^)****\n";

cout << "*..A..B..A^B.*\n";

cout << "* 1 0 " << (1 ^ 0) << " *\n";

cout << "* 0 1 " << (0 ^ 1) << " *\n";

cout << "* 0 0 " << (0 ^ 0) << " *\n";

cout << "* 1 1 " << (1 ^ 1) << " *\n";

cout << "**************\n";

cout << "Hit any key to exit...\n";

getch();

return 0;

}