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  #1  
Old 09-03-2006
Registered User
  

Join Date: Jul 2006
Posts: 24
Bit shift operator
Can someone pls tell me how is the operation different in the following two code snippets?


main()
{
int temp=20742;

short temp1;
temp1 = temp << 8;
printf("The vaue is %d\n",temp1>>8);}

result:6

main()
{
int temp=20742;

short temp1;
temp1 =(temp << 8)>>8;
printf("The vaue is %d\n",temp1);}

result: 20742

If I want to do the operation that I have done in the first code snippet in a single line without using any temp variables, how do I do it?

Thanks,
Anitha
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  #2  
Old 09-04-2006
...@...
  

Join Date: Feb 2004
Location: NM
Posts: 4,274
Code:
int main()
{
  int temp=20742;
  short temp1=temp & 0x00ff;
  printf("The value is %d\n",temp1);
  return 0;
}
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  #3  
Old 09-04-2006
Technorati Master
  

Join Date: Mar 2005
Location: Large scale systems...
Posts: 2,610
Quote:
Originally Posted by naan
Can someone pls tell me how is the operation different in the following two code snippets?


main()
{
int temp=20742;

short temp1;
temp1 = temp << 8;
printf("The vaue is %d\n",temp1>>8);}

result:6

main()
{
int temp=20742;

short temp1;
temp1 =(temp << 8)>>8;
printf("The vaue is %d\n",temp1);}

result: 20742

If I want to do the operation that I have done in the first code snippet in a single line without using any temp variables, how do I do it?

Thanks,
Anitha
you have used short datatype for temp1,
sizeof short datatype=2
sizeof int datatype=4

use as int temp1
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  #4  
Old 09-05-2006
...@...
  

Join Date: Feb 2004
Location: NM
Posts: 4,274
Matrix -
IMO - the OP is trying to zero out the three high-order bytes in the temp variable.
You are right to keep datatypes matching and the OP should just "and" away unwanted stuff:
Code:
int temp=20742 & 0x000000ff;
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  #5  
Old 09-07-2006
Technorati Master
  

Join Date: Mar 2005
Location: Large scale systems...
Posts: 2,610
that's fine Jim...

What's that IMO exactly ..?
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  #6  
Old 09-07-2006
blowtorch's Avatar
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Join Date: Dec 2004
Location: Singapore
Posts: 2,326
IMO: In my opinion
IMHO: In my humble opinion
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