229: Mainline

You can experiment with recursive_power_of_2 in a program such as this:

#include  
/* Define recursive_power_of_2 function: */ 
int recursive_power_of_2 (int n) { 
  if (n == 0) 
    return 1; 
  else 
    return 2 * recursive_power_of_2 (n - 1); 
} 
/* Test recursive_power_of_2 function in main: */ 
main ( ) { 
  printf ("The 0th power of 2 is %i.\n", recursive_power_of_2 (0)); 
  printf ("The 1st power of 2 is %i.\n", recursive_power_of_2 (1)); 
  printf ("The 2nd power of 2 is %i.\n", recursive_power_of_2 (2)); 
  printf ("The 3rd power of 2 is %i.\n", recursive_power_of_2 (3)); 
}