How Bitwise Operators are Used an Example Program

Well, one-by-one we’ve discussed each of the Bitwise
Operator. Starting from Operation
on Bits and Bitwise Operators, we moved on to Right/Left
Bit Shift Operators then discussed Decimal
Number to Binary Conversion Program. and at last Ones
Complement and XOR Operators. After having so much theoretical it’s
time now for a nice Example Program, which is the topic of today’s post.
The code here is basically to show how these bitwise operator are used rather
than what they are used for.


  // Example Program to demonstrate how
  // Ones Complement (~) and XOR (^)
  // Opeartors are used.
  #include<stdio.h>

  // prototype
  void showbits(short int);

  // defined
  void showbits(short int dec_num)
  {
    short int loop, bit, and_mask;

    for(loop=15; loop>=0; loop--)
    {
      and_mask=1<<loop;
      bit=dec_num&and_mask;


      if(bit==0) printf("0");
      else printf("1");
    }
  }

  void main()
  {
    // declare three short ints
    // for storing user inputs
    // and results
    short int a,b,res;
    int ch;

    while(ch!=7)
    {
      // show main menu
      printf("		Main Menu
");
      printf("		---------
");
      printf("1. Perform Left Bit Shift Operation
");
      printf("2. Perform Right Bit Shift Operation
");
      printf("3. Perform AND Operation
");
      printf("4. Perform OR Operation
");
      printf("5. Perform Ones Complement Operation
");
      printf("6. Perform XOR Operation
");
      printf("7. Quit
");
      scanf("%d",&ch);

      switch(ch)
      {
      case 1:
        // take input
        printf("

Enter a decimal number: ");
        scanf("%d",&a);
        printf("
Enter number of places to shift bit: ");
        scanf("%d",&b);


        printf("

	Entered Number: ");
        showbits(a);
        printf(" (decimal %d)",a);

        // perform left bit shift
        // operation
        res=a<<b;

        // show the formatted output
        printf("
	Left Shifted  : ");
        showbits(res);
        printf(" (decimal %d)

",res);

        break;

      case 2:
        // take input
        printf("

Enter a decimal number: ");
        scanf("%d",&a);
        printf("
Enter number of places to shift bit: ");
        scanf("%d",&b);


        printf("

	Entered Number: ");
        showbits(a);
        printf(" (decimal %d)",a);

        // perform right bit shift
        // operation
        res=a>>b;

        // show the formatted output
        printf("
	Right Shifted : ");
        showbits(res);
        printf(" (decimal %d)

",res);

        break;

      case 3:
        printf("

Enter two decimal number: ");
        scanf("%d",&a);
        scanf("%d",&b);

        printf("

	Entered Number 1: ");
        showbits(a);
        printf(" (decimal %d)",a);
        printf("
	Entered Number 2: ");
        showbits(b);
        printf(" (decimal %d)",b);

        // perform AND operation on two
        // variables a and b
        res=a&b;

        printf("
	ANDed          : ");
        showbits(res);
        printf(" (decimal %d)

",res);

        break;

      case 4:
        printf("

Enter two decimal number: ");
        scanf("%d",&a);
        scanf("%d",&b);

        printf("

	Entered Number 1: ");
        showbits(a);
        printf(" (decimal %d)",a);
        printf("
	Entered Number 2: ");
        showbits(b);
        printf(" (decimal %d)",b);

        // perform OR operation on two
        // variables a and b
        res=a|b;

        printf("
	ORed           : ");
        showbits(res);
        printf(" (decimal %d)

",res);

        break;

      case 5:
        // take input
        printf("

Enter a decimal number: ");
        scanf("%d",&a);

        printf("

	Entered Number: ");
        showbits(a);
        printf(" (decimal %d)",a);

        // perform ones complement
        // operation
        res=~a;

        // show the formatted output
        printf("
	~ed           : ");
        showbits(res);
        printf(" (decimal %d)

",res);

        break;

      case 6:
        printf("

Enter two decimal number: ");
        scanf("%d",&a);
        scanf("%d",&b);

        printf("

	Entered Number 1: ");
        showbits(a);
        printf(" (decimal %d)",a);
        printf("
	Entered Number 2: ");
        showbits(b);
        printf(" (decimal %d)",b);

        // perform XOR operation on two
        // variables a and b
        res=a^b;

        printf("
	XORed          : ");
        showbits(res);
        printf(" (decimal %d)

",res);

        break;

      }
    }
  }

Test Run:

   Main Menu
   ---------
   1. Perform Left Bit Shift Operation
   2. Perform Right Bit Shift Operation
   3. Perform AND Operation
   4. Perform OR Operation
   5. Perform Ones Complement Operation
   6. Perform XOR Operation
   7. Quit
   1


   Enter a decimal number: 3476
   Enter number of places to shift bit: 3


   Entered Number: 0000110110010100 (decimal 3476)
   Left Shifted : 0110110010100000 (decimal 27808)

   Main Menu
   ---------
   1. Perform Left Bit Shift Operation
   2. Perform Right Bit Shift Operation
   3. Perform AND Operation
   4. Perform OR Operation
   5. Perform Ones Complement Operation
   6. Perform XOR Operation
   7. Quit
   2


   Enter a decimal number: 543
   Enter number of places to shift bit: 5


   Entered Number: 0000001000011111 (decimal 543)
   Right Shifted : 0000000000010000 (decimal 16)

   Main Menu
   ---------
   1. Perform Left Bit Shift Operation
   2. Perform Right Bit Shift Operation
   3. Perform AND Operation
   4. Perform OR Operation
   5. Perform Ones Complement Operation
   6. Perform XOR Operation
   7. Quit
   7
   Press any key to continue...

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