#include <cstdio>

void foo( unsigned a, unsigned b )
{
    char buf[21];

    a=a%b;
    for( size_t i=0; i!=21; ++i, a=(a*10)%b )
        buf[i] = (a*10)/b;

    unsigned carry = buf[20]>=5;
    buf[20] = '\0';
    for( size_t i=0; i!=20; ++i )
    {
        carry += buf[19-i];
        buf[19-i] = carry%10 + '0';
        carry /= 10;
    }

    puts( buf );
}

int main( void )
{
    foo( 5, 3 );
    foo( 97, 89 );
}