jmyrick.c

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

// pretend that 'a' is 0 and 'b' is one.
// return 1 if we can continue
// return 0 if we are finished
int addOne(char a, char b, int i, char * str) {
    int leftMostZero = i;

    for (leftMostZero = i -1; leftMostZero >=0 && str[leftMostZero] == b;leftMostZero--) {
    }

    if (leftMostZero < 0) { return 0; }
    else {
        str[leftMostZero] = b;
        while(++leftMostZero < i) { str[leftMostZero] = a; }
    }



    // find first instance of a zero


    return 1;
}

void splay(char a, char b, int i) {

    char * buffer = (char *) malloc(i+1); // need to terminate with a null
    // init buffer to all 'zeros'.

    for (int j = 0; j < i; j++) buffer[j] = a;
    buffer[i] = '\0';

    // print
    printf("%s\n",buffer);

    while(addOne(a,b,i,buffer)) {
        // print
        printf("%s\n",buffer);
    }


    free(buffer);
}



int main(int argc, char * argv[]) {

    if(argc < 4) {
        printf("Pass more stuff in (%d).\n",argc);
        return 1;
    }

   splay(argv[1][0], argv[2][0], (int) strtol(argv[3], (char **)NULL, 10));




    return 0;
}