ABAP数据类型转换和不同数据类型比较

DATA:lv_str  TYPE string,
     lv_str2 TYPE string,
     lv_char TYPE char10,
     lv_i    TYPE i VALUE 1,
     lv_f    TYPE p DECIMALS 1 VALUE '1.1'.

lv_str = '1.11'.
lv_char = '1.11'.

"TRUE
IF lv_str = 1.

  WRITE: 111.

ENDIF.

"string 和 char 一样
" string和char转为int，会进行四舍五入 Decimal places are rounded commercially
"TRUE
IF lv_char = 1.

  WRITE: 111.

ENDIF.


lv_str2 = '1.66'.
"FALSE
IF lv_str2 = 1.

  WRITE: 111.

ENDIF.

"TRUE
IF lv_str = lv_i.
  WRITE:222.
ENDIF.

"如果lv_f = 1.10 type p decimal 2 false
"    lv_f = 1.1 type p decimal 1  true
"    lv_f = 1.1 type p decimal 2  false

"TRUE
IF lv_str = lv_f.
  WRITE:333.
ENDIF.

"解决办法
"1/使用算术表达式代替逻辑表达式
"FALSE
IF + lv_str = 1.
  WRITE: 444.
ENDIF.

"2/ 强转
"FALSE
IF lv_str = CONV decfloat16( 1 ).
  WRITE: 555.
ENDIF.

               | decfloat16, decfloat34 | f | p | int8 | i, s, b |
.--------------|------------------------|---|---|------|---------|
| string, c, n | decfloat34             | f | p | int8 | i       |