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Slight modification of itkamaraj's fine proposal to yield the full required output:
echo "a=5; /* this is a comment */" | sed "s;.*\(/\*.*\*/\);\1;"
/* this is a comment */

try this

echo "a=5; /* this is a comment */" | sed "s;.*/\*\(.*\)\*/;\1;"

I didn't say that writing a C compiler in shell was annoying; I said that shell is the wrong language to use to write a C compiler.

Of course, another option would be to write an emulator for the...

I fail to see how this thread is fundamentally different from the 1st question in your first thread: How to extract operand size in bits of a C program?...

OK. That is a different question totally unrelated to the title of this thread. The highest bit set in a non-negative integer number for a number that will fit in a C signed long integer value can...

You don't find the number of bits in the result of adding two values in a C program in the shell; you find that number in your C program. And, the number of bytes in the result of an addition...