PLEASE EXPLAIN THIS CODE LINE BY LINE. I KNOW THE OUTPUT. I AM TRYING TO LEARN. THANK YOU FOR YOUR TIME. IT'S C PROGRAM.

#include

void up_and_down(int n);

int main (void)

{

up_and_down(1);

return 0;

}

void up_and_down(int n)

{

printf("Level %d ", n);

if(n<5)

{

up_and_down(n+1);

}

printf("LEVEL %d ", n);

}