/* MUMPS */
MID3(N)  ;
        N LEN,N2
        S N2=$S(N<0:-N,1:N)
        I N2<100 Q "NUMBER TOO SMALL"
        S LEN=$L(N2)
        I LEN#2=0 Q "EVEN NUMBER OF DIGITS"
        Q $E(N2,LEN\2,LEN\2+2)

F I=123,12345,1234567,987654321,10001,-10001,-123,-100,100,-12345,1,2,-1,-10,2002,-2002,0 W !,$J(I,10),": ",$$MID3^MID3(I)