Zahlenfolge

#include <stdio.h>

#define MAX 10
#define START "0"
#define SIZE 8192

int main (int argc, char *argv[])
{
        int c, i, len, pos, vn, vo, d=MAX;
        char buf[SIZE+1], new[SIZE+1], val[5];

        if (argc>1) d=atoi(argv[1]);

        strcpy(new, START);
        printf("%s\n", new);

        for (i=0; i<d; i++) {
                strcpy(buf, new);

                vo=buf[0]-48;
                c=0;
                len=strlen(buf);
                new[0]='\0';
                for (pos=0;pos<len;pos++) {
                        vn=buf[pos]-48;

                        if (vn==vo) c++;
                        else {
                                sprintf(val, "%u%u", c, vo);
                                strcat(new, val);
                                vo=vn;
                                c=1;
                        }
                }
                sprintf(val, "%u%u", c, vo);
                strcat(new, val);
                printf("%s\n", new);
        }
}