#include <stdio.h>

unsigned long base10;
int newbase;
char swap[100],c[100];
unsigned long rest,erg;
int pos=0;
int i;

int main()
{
base10=19990320;
newbase=36;

printf("Zahl im 10er-System:");
scanf("%d",&base10);
printf("Neues Zahlensystem:");
scanf("%d",&newbase);

c[pos]='0'+rest;
while (base10 > 0)
  {
    erg=base10/newbase;
    rest=base10%newbase;
    if (rest <= 9) 
      c[pos]='0'+rest;
    else
      c[pos]='A'+(rest-10);
    
    base10=erg;
    pos++;
    c[pos]='\0';
  }

pos--;
for (i=0;i<=pos;i++)
  {
    swap[i]=c[pos-i];
  }

printf("Zahl im %der-system:%s\n",newbase,swap);
}