From: Darin McBride 

On June 2, 2004 9:39 pm, Bruce D. Wedding wrote:
> I found these on a C Yahoo group and some look like fun.
>
> 1. Write a "Hello World" program in 'C' without using a
semicolon. (Hint:
> this makes use of C99 to be legal)

Ok, that is something I'm not aware of... lemme guess...

int main()
{
  return printf("hello world\n") \u3b
}

although I can't get it to work here ...

> 2. Write a C program without using any loop (if, for, while etc) to print
> numbers from 1 to 100 and 100 to 1;

Done.  :-)

> 3. Find if the given number is a power of 2.

#include "bitcnt_1.c"
#include "stdlib.h"
int main(int argc, char* argv[])
{
  int x = atoi(argv[1]);
  if (bit_count(x) == 1)
    printf("%d is a power of 2\n", x);
  return 0;
}

> 4. Multiply x by 7 without using multiplication (*) operator.

x+x+x+x+x+x+x?

> 5. Write a function in different ways that will return f(7) = 4 and f(4) =
> 7

My favourite... ;-)

int func(int x)
{
    switch (x) {
    case 7:
        return 4;
    case 4:
        return 7;
    }
    return 0;
}

> 6. Remove duplicates in array
>
> 7. Finding if there is any loop inside linked list.
>
> 8. Write code to determine if a TYPE is signed or unsigned.  Got it?  OK,
> write code to determine if a value is unsigned or signed.

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