Re: [algogeeks] wrong output of C program

[sengar.mahi]

Good Question ,eagerly waiting for some good explanation to this one !!!

On Fri, Jun 8, 2012 at 5:46 AM, Mad Coder imamadco...@gmail.com wrote:

 The following is a simple C program which tries to multiply an integer by
 5 using the bitwise operations. But it doesn't do so. Explain the reason
 for the wrong behavior of the program.

   #include stdio.h
   #define PrintInt(expr) printf(%s : %d\n,#expr,(expr))
   *int* FiveTimes(*int* a)
   {
   *int* t;

   t *=* a**2 *+* a;

   *return* t;
   }

   *int* main()
   {
   *int* a *=* 1, b *=* 2,c *=* 3;

   PrintInt(FiveTimes(a));
   PrintInt(FiveTimes(b));

   PrintInt(FiveTimes(c));
   *return* 0;
   }

  --
 You received this message because you are subscribed to the Google Groups
 Algorithm Geeks group.
 To post to this group, send email to algogeeks@googlegroups.com.
 To unsubscribe from this group, send email to
 algogeeks+unsubscr...@googlegroups.com.
 For more options, visit this group at
 http://groups.google.com/group/algogeeks?hl=en.


-- 
You received this message because you are subscribed to the Google Groups 
Algorithm Geeks group.
To post to this group, send email to algogeeks@googlegroups.com.
To unsubscribe from this group, send email to 
algogeeks+unsubscr...@googlegroups.com.
For more options, visit this group at 
http://groups.google.com/group/algogeeks?hl=en.

Re: [algogeeks] wrong output of C program

[Navin Kumar]

one left shift is equivalent to multiplying with 2.Two left is equivalent
to multiplying with 2^2. and so on. so i left shift means multiplying with
2^i.

In your program you did left shift with 2.so it is equivalent to
multiplying with 4. so when input is 1 function will return 4*1+1=5. when
input is 2..output is 2*4+2=10.For 3 o/p is 3*4+3=15

On Fri, Jun 8, 2012 at 5:46 AM, Mad Coder imamadco...@gmail.com wrote:

 The following is a simple C program which tries to multiply an integer by
 5 using the bitwise operations. But it doesn't do so. Explain the reason
 for the wrong behavior of the program.

   #include stdio.h
   #define PrintInt(expr) printf(%s : %d\n,#expr,(expr))
   *int* FiveTimes(*int* a)
   {
   *int* t;

   t *=* a**2 *+* a;

   *return* t;
   }

   *int* main()
   {
   *int* a *=* 1, b *=* 2,c *=* 3;

   PrintInt(FiveTimes(a));
   PrintInt(FiveTimes(b));

   PrintInt(FiveTimes(c));
   *return* 0;
   }

  --
 You received this message because you are subscribed to the Google Groups
 Algorithm Geeks group.
 To post to this group, send email to algogeeks@googlegroups.com.
 To unsubscribe from this group, send email to
 algogeeks+unsubscr...@googlegroups.com.
 For more options, visit this group at
 http://groups.google.com/group/algogeeks?hl=en.


-- 
You received this message because you are subscribed to the Google Groups 
Algorithm Geeks group.
To post to this group, send email to algogeeks@googlegroups.com.
To unsubscribe from this group, send email to 
algogeeks+unsubscr...@googlegroups.com.
For more options, visit this group at 
http://groups.google.com/group/algogeeks?hl=en.