ACM 10473 - Simple Base Conversion

#include <stdio.h>
int main()
{
    int i, n;
    char str[10];
    while (1)
    {
       scanf ("%s", str);
       if (str[0] == '-') break;
       else if (str[0] != '0')
          sscanf(str ,"%d" ,&n), printf("0x%X\n", n);
       else
          sscanf(str ,"%x" ,&n), printf("%d\n", n);
    }   
    return 0;
}

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