Rounding up a number to next power of 2.

By using the concept of filling all the bits by 1 using shift operation. 
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#include<stdio.h>

int main()

{

      unsigned int n =1;

      n |= n >> 1;

      n |= n >> 2;

      n |= n >> 4;

      n |= n >> 8;

      n |= n >> 16;

      n++;

      printf("\nn=%d\n",n);

      return 0;

}