C printf()格式化: Float doesn't seem to right justify.

Question

当我尝试格式化此输出时发生了一些奇怪的事情， float 似乎没有右对齐？

我希望小数点对齐...我做错了什么吗？

if (flushParams -> Volume > 0)
{   
    printf("\n      %-23s %7ld %2s  %7ld %3s  %2s %4.1f %1s  %9s %4.1f %2s %9s %4.1f %2s",
           "Intake Flush",
           event_data -> water1.ml, "ml",
           event_data -> water1.secs, "sec",
           "LB", event_data -> water1.bat, "V",
           "Average I", event_data -> water1.average_current, "mA",
           "Highest I", event_data -> water1.highest_current,  "mA");
    Message(event_data -> water1.message);
    printf("\n      %-11s = %02d", "Flush port", event_data -> portwater);
}
printf("\n\n      %-23s %7ld %2s  %7ld %3s  %2s %4.1f %1s  %9s %4.1f %2s %9s %4.1f %2s",
       "Sample",
       event_data -> sample.ml, "ml",
       event_data -> sample.secs, "sec",
       "LB", event_data -> sample.bat, "V",
       "Average I", event_data -> sample.average_current, "mA",
       "Highest I", event_data -> sample.highest_current,  "mA"); 
Message(event_data -> sample.message);
printf("\n      %-11s = %02d", "Sample port", event_data -> portsample);
printf("\n      ");
print_datetime(event_data -> time_off);
printf("  %3.1f Vbat  %3.1f %cC  PORT = %02d", 
       event_data -> vbat_off, event_data -> celcius_off, 248, event_data -> portend);

printf("\n");

输出看起来像这样:

  Intake Flush                101 ml       34 sec  LB 22.5 V  Average I 113.0 mA Highest I 118.0 mA Volume reached
  Flush port  = 00

  Sample                      320 ml      141 sec  LB 22.5 V  Average I 91.0 mA Highest I 97.0 mA Volume reached
  Sample port = 01
  12/09/15 17:11:14  22.6 Vbat  22.5 øC  PORT = 01

请注意“平均 I”和“最高 I”值如何不对齐？默认情况下它们不应该右对齐吗？我希望 float 的最后显示数字位于我为 float 指定的 4 个字符空间中最右边的位置。多头显示出我预期的方式。

Answer 1

对于您的数据，将 %4.1f 更改为 %5.1f 将解决此问题。在 %m.nf 格式说明符中，m 是字段的总宽度(以字节为单位)，而不是小数点前的位数。