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Full Discussion: Subtract coloumn3 with coloumn 4 & divide it
Top Forums Shell Programming and Scripting Subtract coloumn3 with coloumn 4 & divide it Post 302958724 by Don Cragun on Sunday 25th of October 2015 11:39:01 PM
Old 10-26-2015
Quote:
Originally Posted by jgt
Code:
 val> 1.4

You should change this to
Code:
val => 1.50

No where in your division do you truncate or round the quotient to 1 decimal place.
You are correct in noting that using val > 1.4 as a synonym for val >= 1.5 is wrong. But, there are a few issues here.
  1. The awk greater than or equal comparison operator is >=; not =>.
  2. When printing numbers with print or printf with the format specifier %.1f, the printing function will round the value being printed up or down to the closest number representable in that format to the value being printed. (So, the values 1.47 and 1.5491 would print as 1.5.)
  3. The >= comparison operator compares values without regard to how that value might be rounded by various print format specifiers. (So, the comparison 1.47 >= 1.5 evaluates to false even though both values would print as 1.5 if printed using printf("%.1f\n", value).)
  4. The double precision floating point value 1.5 happens to have an exact representation as an IEEE floating point value. The decimal values 1.3, 1.6, and 1.7, however, are not exactly representable in that format.
 

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