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please help.function in C

  • sanndra9
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Post March 28th, 2004, 9:08 am

Please help.I have to write a function in C language.
Here it is.Function must return integer number in which bits from position m to position n are set to 1.
For example input number is 17,and bits on his position five to ten (counting from left ) have value 0 but they have to be changed into value 1,so the number that the function is now returning is 1937.

17 is 0000000000010001 (if size of integer is 2B)
Bold elements are positions between which bits are set to one:
0000011110010001 and now that number is 1937.
I hope it is clear.Thanks.Sanndra
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Post March 28th, 2004, 9:08 am

  • _Leo_
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Post March 28th, 2004, 11:46 am

Easy:

Code: [ Select ]
int fill(int ls, int ms, int number) {

 int mask = 0;

 for(int i=ls; i<=ms; i++) {

  mask |= (int)pow(2, i);
 }

 return(number | mask);
}
  1. int fill(int ls, int ms, int number) {
  3.  int mask = 0;
  5.  for(int i=ls; i<=ms; i++) {
  7.   mask |= (int)pow(2, i);
  8.  }
  10.  return(number | mask);
  11. }


ls : less significant bit to start raising
ms : most significant bit to stop
number : number to modify

It's working ok, you have to include <math.h> for using pow()

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