abap中AT USER-COMMAND.DATA:NUMBER1 TYPE I VALUE 20,NUMBER2 TYPE I VALUE 5,RESULT TYPE I.START-OF-SELECTION.WRITE:/ NUMBER1,',NUMBER2.AT USER-COMMAND.CASE SY-UCOMM.WHEN 'ADD'.RESULT = NUMBER1 + NUMBER2.WHEN 'SUBT'.RESULT = NUMBER1 - NUMBER2.WHEN 'MUL
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![abap中AT USER-COMMAND.DATA:NUMBER1 TYPE I VALUE 20,NUMBER2 TYPE I VALUE 5,RESULT TYPE I.START-OF-SELECTION.WRITE:/ NUMBER1,',NUMBER2.AT USER-COMMAND.CASE SY-UCOMM.WHEN 'ADD'.RESULT = NUMBER1 + NUMBER2.WHEN 'SUBT'.RESULT = NUMBER1 - NUMBER2.WHEN 'MUL](/uploads/image/z/14066828-44-8.jpg?t=abap%E4%B8%ADAT+USER-COMMAND.DATA%3ANUMBER1+TYPE+I+VALUE+20%2CNUMBER2+TYPE+I+VALUE+5%2CRESULT+TYPE+I.START-OF-SELECTION.WRITE%3A%2F+NUMBER1%2C%27%2CNUMBER2.AT+USER-COMMAND.CASE+SY-UCOMM.WHEN+%27ADD%27.RESULT+%3D+NUMBER1+%2B+NUMBER2.WHEN+%27SUBT%27.RESULT+%3D+NUMBER1+-+NUMBER2.WHEN+%27MUL)
abap中AT USER-COMMAND.DATA:NUMBER1 TYPE I VALUE 20,NUMBER2 TYPE I VALUE 5,RESULT TYPE I.START-OF-SELECTION.WRITE:/ NUMBER1,',NUMBER2.AT USER-COMMAND.CASE SY-UCOMM.WHEN 'ADD'.RESULT = NUMBER1 + NUMBER2.WHEN 'SUBT'.RESULT = NUMBER1 - NUMBER2.WHEN 'MUL
abap中AT USER-COMMAND.
DATA:NUMBER1 TYPE I VALUE 20,
NUMBER2 TYPE I VALUE 5,
RESULT TYPE I.
START-OF-SELECTION.
WRITE:/ NUMBER1,',NUMBER2.
AT USER-COMMAND.
CASE SY-UCOMM.
WHEN 'ADD'.
RESULT = NUMBER1 + NUMBER2.
WHEN 'SUBT'.
RESULT = NUMBER1 - NUMBER2.
WHEN 'MULT'.
RESULT = NUMBER1 * NUMBER2.
WHEN 'DIVI'.
RESULT = NUMBER1 / NUMBER2.
WHEN OTHERS.
WRITE 'Unknown function code'.
EXIT.
ENDCASE.
WRITE:/ 'Result:',RESULT.
在这段代码中at user-command起到什么作用?
abap中AT USER-COMMAND.DATA:NUMBER1 TYPE I VALUE 20,NUMBER2 TYPE I VALUE 5,RESULT TYPE I.START-OF-SELECTION.WRITE:/ NUMBER1,',NUMBER2.AT USER-COMMAND.CASE SY-UCOMM.WHEN 'ADD'.RESULT = NUMBER1 + NUMBER2.WHEN 'SUBT'.RESULT = NUMBER1 - NUMBER2.WHEN 'MUL
在点击屏幕按钮的时候,将触发这个过程