C: Looping without using looping statements or recursion

Question

I want to write a C function that will print 1 to N one per each line on the stdout where N is a int parameter to the function. The function should not use while, for, do-while

Answer 1

You can do this by nesting macros.

int i = 1;

#define PRINT_1(N) if( i < N ) printf("%d\n", i++ );
#define PRINT_2(N) PRINT_1(N) PRINT_1(N)
#define PRINT_3(N) PRINT_2(N) PRINT_2(N)
#define PRINT_4(N) PRINT_3(N) PRINT_3(N)
:
:
#define PRINT_32(N) PRINT_31(N) PRINT_31(N)

There will be 32 macros in total. Assuming size of int as 4 bytes. Now call PRINT_32(N) from any function.

Edit: Adding example for clarity.

void Foo( int n )
{
    i = 1;

    PRINT_32( n );
}


void main()
{
    Foo( 5 );
    Foo( 55 );
    Foo( 555 );
    Foo( 5555 );
}