写出下列程序的执行结果。 (1).CLEAR SET.TALK.OFF ..x=10 y=-3 FOR.n=29+x.TO.x.STEP.y ENDFOR ?.n RETURN 9 (2).主程序:t1.prg SET.TALK.OFF STORE.′AB′.TO.k1,k2 DO.t2 ?.k1+k2 RETURN 子程序:t2 prg PRIVATE.k1 k1=k2+′′250′′ ?.k1 RETURN “AB250” “ABAB” (3).SET.TALK.OFF CLEAR STORE.1.TO.x STORE.20.TO.y DO.WHILE.x<=y IF.INT(x/2)<>x/2 x=1+x^2 y=y+1 LOOP ELSE x=x+1 ENDIF ENDDO ?.x,y SET.TALK.ON RETURN.