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DATA : BEGIN OF hah,
flag TYPE c,这个结果是:
现在,我要把凡是flag没有值的,都赋值为'x’,
第一种办法:
DATA : BEGIN OF hah,
flag TYPE c,
sex TYPE c,
END OF hah.
DATA it_hah like TABLE OF hah.
CLEAR hah.
hah-flag = 'X'.
hah-sex = 'f'.
APPEND hah to it_hah.
CLEAR hah.
hah-sex = 'm'.
APPEND hah to it_hah.
CLEAR hah.
hah-sex = 'm'.
APPEND hah to it_hah.
CLEAR hah.
hah-sex = 'm'.
APPEND hah to it_hah.
*****************这里**************
LOOP AT it_hah INTO hah.
IF hah-flag is INITIAL.
hah-flag = 'x'.
ENDIF.
MODIFY it_hah FROM hah.
ENDLOOP.
************************************
LOOP AT it_hah INTO hah.
WRITE :/ hah-flag,' ',hah-sex.
ENDLOOP.
这种办法效率不够高,采用第二种办法的话,效率会高一点:
DATA : BEGIN OF hah,
flag TYPE c,
sex TYPE c,
END OF hah.
DATA it_hah like TABLE OF hah.
CLEAR hah.
hah-flag = 'X'.
hah-sex = 'f'.
APPEND hah to it_hah.
CLEAR hah.
hah-sex = 'm'.
APPEND hah to it_hah.
CLEAR hah.
hah-sex = 'm'.
APPEND hah to it_hah.
CLEAR hah.
hah-sex = 'm'.
APPEND hah to it_hah.
*****************这里***************
hah-flag = 'x'.
MODIFY it_hah FROM hah TRANSPORTING flag WHERE flag is INITIAL.
****************************
LOOP AT it_hah INTO hah.
WRITE :/ hah-flag,' ',hah-sex.
ENDLOOP.
明显第二种效率会高于第一种。
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