Re: [algogeeks] wrong output of C program
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 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
> #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;
> }
>
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Re: [algogeeks] wrong output of C program
Good Question ,eagerly waiting for some good explanation to this one !!!
On Fri, Jun 8, 2012 at 5:46 AM, Mad Coder 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
> #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;
> }
>
> --
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> "Algorithm Geeks" group.
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> For more options, visit this group at
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>
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[algogeeks] wrong output of C program
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
#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;
}
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