Turnurile din hanoi

#include<stdio.h>
#include<stdlib.h>

void h(int n, char a, char b, char c)
{
    if (n == 1) printf("%c %c\n", a, b);
    else
    {
        h(n - 1, a, c, b);
        printf("%c %c\n", a, b);
        h(n - 1, c, b, a);
    }
}
int main()
{
    unsigned n;
    printf("n= "); scanf("%u", &n);
    h(n, 'a', 'b', 'c');


    return 0;
}