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without knowing what you did with grep it's hard to see what to do with C/C++...

In its simplest form you can do this to print matching lines:

#include <stdlib.h>
#include <string.h>

int...

Use printf instead of echo. You can use fixed width for columns and stuff like left-bound or right-bound with it etc.

> a=0.001
> b=0.5/$a
> echo $b
0.5/0.001
> c=`echo 0.5 / $a | bc`
> echo $c
500
>

regexp like:


[0-9]\.[0-9]\{4\}e[+-][0-9]


should work