小学一年级加减法生成器

      前段时间，女儿所在的学校要求家长每天都要给孩子出一些加减法的数学题，让孩子练习。作为会一点程序设计的我来说，总想偷一些懒，于是制作了以下程序。

     程序窗口，如下所示。

具体源代码如下：

首先，在表单Form1的 init 事件中，    加入以下代码

CLOSE TABLES ALL
THISFORM.spinner1.VALUE = 0
THISFORM.spinner2.VALUE = 10
THISFORM.optiongroup1.VALUE = 1
THISFORM.optiongroup1.INTERACTIVECHANGE
WITH  THISFORM.list1
    .BOUNDCOLUMN = 1
    .COLUMNWIDTHS = ' 100'
    .COLUMNCOUNT = 1
    .COLUMNLINES = .T.
    .ITEMTIPS = .T.
    .ROWSOURCETYPE = 6
    .ROWSOURCE = ""
ENDWITH

 第二，在单选按钮组Optiongroup1的 InteractiveChange 事件中，加入以下代码

THISFORM.list1.ROWSOURCE = ""
IF  USED( " _temp " )
   USE  IN  _temp
ENDIF
m = THIS.VALUE
s = ""
DO   CASE
    CASE  m = 1
      s = " 和的最大值 "
    CASE  m = 2
      s = " 被减数的最大值 "
    CASE  m = 3
      s = " 积的最大值 "
    CASE  m = 4
      s = " 被除数的最大值 "
    CASE  m = 5
      s = " 以内的加减法 "
    CASE  m = 6
      s = " 以内的乘除法 "
    CASE  m = 7
      s = " 和的最大值 "
    CASE  m = 8
      s = " 被减数的最大值 "
ENDCASE
THISFORM.label2.CAPTION = s

 第三，“生成试题”命令按钮Command1的 Click 事件中加入以下代码

m1 = THISFORM.optiongroup1.VALUE
m2 = THISFORM.spinner1.VALUE   && 数量
m3 = THISFORM.spinner2.VALUE   && 最大数
m4 = LEN(ALLT(STR(m3)))        && 最大数的位数
m4 = IIF(m3 = 10 , 1 ,m4)

IF USED( " _temp " )
   USE IN _temp
ENDIF
CREATE CURSOR _temp (nn1 c( 30 ),nn2 c( 30 ),nn3 c( 30 ))
SELE _temp
THISFORM.list1.ROWSOURCE = " _temp.nn1 "

DO WHILE RECC() < m2
   k1 = INT(RAND() * m3)
   k2 = INT(RAND() * m3)
   DO CASE
      CASE m1 = 1    &&  两数的加法
         IF k1 >= 0  AND k2 >= 0  AND k1 + k2 <= m3
            s = STR(k1,m4) + " ＋ " + STR(k2,m4)
            APPE BLAN
            REPL nn1 WITH s
         ENDIF
      CASE m1 = 2    &&  两数的减法
         IF k1 >= 0  AND k2 >= 0  AND k1 - k2 <= m3 AND k1 - k2 >= 0
            s = STR(k1,m4) + " － " + STR(k2,m4)
            APPE BLAN
            REPL nn1 WITH s
         ENDIF
      CASE m1 = 3    &&  两数的乘法
         IF k1 > 0  AND k2 >= 0  AND k1 * k2 <= m3
            s = STR(k1,m4) + " × " + STR(k2,m4)
            APPE BLAN
            REPL nn1 WITH s
         ENDIF
      CASE m1 = 4   &&  两数的除法
         IF k1 > 0  AND k2 > 0  AND INT(k1 / k2) = k1 / k2   && 注意除数不能为0
            s = STR(k1,m4) + " ÷ " + STR(k2,m4)
            APPE BLAN
            REPL nn1 WITH s
         ENDIF
      CASE m1 = 5    && 加减混合
         k01 = MOD(INT(RAND() * 100 ), 2 )   && 两次运算的符号
         k02 = IIF(k01 = 0 , 1 , 0 )           && 两次运算符号相反
         IF k01 = 0    && 加法
            k41 = k1 + k2
            k3 = INT(RAND() * k41)
            k42 = k41 - k3
            s = STR(k1,m4) + " ＋ " + STR(k2,m4) + " － " + STR(k3,m4)
         ELSE
            k41 = k1 - k2
            k3 = INT(RAND() * m3)
            k42 = k41 + k3
            s = STR(k1,m4) + " － " + STR(k2,m4) + " ＋ " + STR(k3,m4)
         ENDIF
         IF k1 > 0  AND k2 >= 0  AND k41 >= 0  AND k42 >= 0  AND k41 <= m3 AND k42 <= m3 AND k2 + k3 <> 0
            APPE BLAN
            REPL nn1 WITH s
         ENDIF
      CASE m1 = 6    && 乘除混合
         EXIT
      CASE m1 = 7    && 三数连加
         k3 = INT(RAND() * m3)
         s = STR(k1,m4) + " ＋ " + STR(k2,m4) + " ＋ " + STR(k3,m4)
         IF k1 > 0  AND k2 >= 0  AND k3 >= 0  AND k1 + k2 + k3 <= m3 AND k2 + k3 <> 0
            APPE BLAN
            REPL nn1 WITH s
         ENDIF
      CASE m1 = 8    && 三数连减
         k3 = INT(RAND() * m3)
         s = STR(k1,m4) + " － " + STR(k2,m4) + " － " + STR(k3,m4)
         IF k1 > 0  AND k2 >= 0  AND k1 - k2 >= 0  AND k1 - k2 - k3 >= 0  AND k2 + k3 <> 0
            APPE BLAN
            REPL nn1 WITH s
         ENDIF
   ENDCASE
ENDDO
SELE _temp
REPLACE ALL nn2 WITH STRTRAN(STRTRAN(STRTRAN(STRTRAN(s, " ＋ " , " + " ), " － " , " - " ), " × " , " * " ), " ÷ " , " / " )
REPLACE ALL nn3 WITH RTRIM(nn1) + " ＝ "
GO TOP
THISFORM.list1.ROWSOURCE = " _temp.nn1 "
THISFORM.list1.REFRESH

 第四，“打印预览”命令按钮Command2的 Click 事件中加入以下代码 

THISFORM.LOCKSCREEN = .T.
_m_maxbutton = THISFORM.MAXBUTTON
_m_windowstate = THISFORM.WINDOWSTATE
_m_caption = THISFORM.CAPTION
THISFORM.MAXBUTTON = .T.
THISFORM.WINDOWSTATE = 2
THISFORM.CAPTION = '   预览'
REPORT FORM 算数.lbx PREVIEW  WINDOWS form1
THISFORM.MAXBUTTON = _m_maxbutton
THISFORM.WINDOWSTATE = _m_windowstate
THISFORM.CAPTION = _m_caption
THISFORM.LOCKSCREEN = .F.

  

      打印报表，如下所示。