Dealing with multiplying fractions in solidity

Question

I'm trying to multiply fractions in solidity. Does anyone know of a library or standard contract that provides overflow protection?

I'm assuming that I would have to make the decimal into a fraction first?

score 2 · Answer 1 · answered Sep 02 '17 at 19:27

2

This is the standard library for safe math functions. Also, another option instead of decimals is just to multiply everything by a big number.

answered Sep 02 '17 at 19:27

thefett

score 0 · Answer 2 · answered Aug 06 '18 at 15:59

If you want to do something like

1 ether * 0.5

You can check out DS-Math.

Where you can do something like this

wmul(1, 0.5);

Or to be more precise

wmul(1000000000000000000, 500000000000000000); //1 ETH * 0.5

It seems to work fine but be careful because right now the project is not that popular compared to SafeMath...

2 Answers2