How to convert very large string to number in C?

Question

I am doing my 3x program and developing 3x I found this article about handling big numbers but final result is string and with string I can't do math operations. I use gcc compiler.

Also this program is not meant to solve problem, I created just to test performance.

You need to create functions that can do math using the strings - or use a library that has already solved that — Ted Lyngmo, Jul 17 '22 at 14:25
Note that the approach that @Ted suggests is exactly what the answer you referenced demonstrates. Also, there are existing third-party libraries for arbitrary-precision arithmetic that are reasonably featureful. — John Bollinger, Jul 17 '22 at 14:40
And existing multi-precision libraries usually perform well, in addition to being feature complete. — Jonathan Leffler, Jul 17 '22 at 14:58
Please provide enough code so others can better understand or reproduce the problem. — Community, Jul 17 '22 at 23:00

score 0 · Answer 1 · answered Jul 17 '22 at 19:02

0

In fact, you can't. C supports integers of limited length (64 bits, about 20 digits), and floats (about 15 significant digits), not larger.

So there is no better way than using a representation in a large radix (power of 2 or power of 10) and implementing the operations based on this representation. E.g. addition can be done digit by digit, with occasional carries.

answered Jul 17 '22 at 19:02

Actually I did what I wanted using GNU GMP library. Code is on GitHub if you want take a look. Thanks to everyone which contributed. – Andrej Jul 17 '22 at 19:56

How to convert very large string to number in C?

1 Answers1