int num( []int a; ) { return a[ 0 ]; };
int den( []int a; ) { return a[ 1 ]; };
[]int rational( int a, b; ) {
	[]int result = new []int{ a, b };
	return result;
	}
void printRat( []int r; ) {
	println( num( r ) + "/" + den( r ) );
	}
real ratToReal( []int r; ) {
	return ( num( r ) + 0.0 ) / den( r );
	}
[]int r = rational( 3, 2 );
printRat( r );
println( ratToReal( r ) );