SAP ABAP 学习总结（4）：Basic ABAP Statements + Debug（基本ABAP语句+调试）

• if else 语句

* if else语句
DATA: gv_int TYPE i VALUE 1."定义一个变量

IF gv_int > 0.
  WRITE:'Above 0'.
ELSE.
  WRITE:'No'.
ENDIF.

• AND OR NOT

* AND OR NOT
DATA: gv_int TYPE i VALUE 1."定义一个变量
DATA: ga_char TYPE c VALUE 'A'."定义一个字符串

IF gv_int > 0 AND ga_char = 'A'.
  WRITE:'Above 0'.
ELSE.
  WRITE:'No'.
ENDIF.

• CASE

*CASE
DATA: ga_char TYPE c VALUE 'A'."定义一个字符串

CASE ga_char.
  WHEN 'A'.
    WRITE:'我是A'.
  WHEN 'B'.
    WRITE:'我是B'.
  WHEN OTHERS.
    WRITE:'我是其他'.
ENDCASE.

• if elseif

*if
*else if
DATA: ga_char TYPE c VALUE 'A'."定义一个字符串

IF ga_char = 'B'.
  WRITE:'我是B'.
ELSEIF ga_char = 'A'.
  WRITE:'我是A'.
ELSEIF ga_char = 'C'.
  WRITE:'我是C'.
ELSE.
  WRITE:'我是其他'.
ENDIF.

• DO循环

*DO循环，不指定次数
DATA: lv_int TYPE i VALUE 0.
DO.
  lv_int = lv_int + 1.
  WRITE: / lv_int.
  IF  lv_i