字符串中 加入 空格

4.6C的帮助：
For the highlighted argument positions of the following ABAP statements, blank characters at the end of strings are not taken into account. This may change in the next release.
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7.0的帮助：
In contrast to text fields, trailing blanks are always taken into account in text strings. There is a specific string literal for text strings.
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Changes in Release 6.10:
Modification 6
Introduction of string literals
String literals are enclosed by grave accents (`)of the form str = `ABC`. String literals are of data type STRING and trailing spaces are taken into account, as opposed to text literals.
data: STR1 type string value 'ABC  ',
      STR2 type string value `ABC  `,
      CNT1 type i,
      CNT2 type i.
CNT1 = strlen( STR1 ).
CNT2 = strlen( STR2 ).
write: / CNT1, CNT2.
The length for the string STR1 will be CNT1 = 3 and for the string STR2 it will be CNT2 = 5.