偶然发现abap中的write语句还有个可以指定数字输出格式的style选项。
F1中的英文帮助截图如下：
可以通过style指定7种格式，这些格式在class CL_ABAP_FORMAT中的属性界面中找到，如下：
1, O_SIMPLE: 输出和su3中用户设定相同数字显示格式，结尾的0不显示
2, O_SIGN_AS_POSTFIX：与O_SIMPLE类似只不过，符号放在右边，正数符号为空
3, O_SCALE_PRESERVING：与O_SIMPLE类似，数字结尾无效的0也显示
4, O_SCIENTIFIC：科学计数法
5, O_SCIENTIFIC_WITH_LEADING_ZERO：带前导零的科学计数法，也就是小数点前是0
6, O_SCALE_PRESERVING_SCIENTIFIC：与O_SCIENTIFIC类似，数字结尾的0也显示
7, O_ENGINEERING：与O_SCIENTIFIC类似，只不过小数点前固定显示3位。
详细参照下面例子程序：
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REPORT ztest_unit_string_convert LINE-SIZE 255.
DATA: l_conv(132) TYPE c. "Convert to local format
DATA: l_number TYPE decfloat34 VALUE '-123456789.10'.
WRITE l_number TO l_conv STYLE cl_abap_format=>o_simple LEFT-JUSTIFIED.
WRITE:`O_SIMPLE: `, l_conv.
WRITE l_number TO l_conv STYLE cl_abap_format=>o_sign_as_postfix LEFT-JUSTIFIED.
WRITE:/ `O_SIGN_AS_POSTFIX: `, l_conv.
WRITE l_number TO l_conv STYLE cl_abap_format=>o_scale_preserving LEFT-JUSTIFIED.
WRITE:/ `O_SCALE_PRESERVING: `, l_conv.
WRITE l_number TO l_conv STYLE cl_abap_format=>o_scientific LEFT-JUSTIFIED.
WRITE:/ `O_SCIENTIFIC: `, l_conv.
WRITE l_number TO l_conv STYLE cl_abap_format=>o_scientific_with_leading_zero LEFT-JUSTIFIED.
WRITE:/ `O_SCIENTIFIC_WITH_LEADING_ZERO:`, l_conv.
WRITE l_number TO l_conv STYLE cl_abap_format=>o_scale_preserving_scientific LEFT-JUSTIFIED.
WRITE:/ `O_SCALE_PRESERVING_SCIENTIFIC: `, l_conv.
WRITE l_number TO l_conv STYLE cl_abap_format=>o_engineering LEFT-JUSTIFIED.
WRITE:/ `O_ENGINEERING: `, l_conv.
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显示结果：
以上。