Hi. Is it safe to do arithmetic operations with different

Question

Solidity Development

Bogdan

Hi. Is it safe to do arithmetic operations with different

uint? For example uint256 with uint16 or better to use one type?

#english #programming #solidity

0

15.10.2023

9 ответов

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SPooCK

It depends what you're trying to do and what you expect to be the maximum uint in your arithmetic's. Using smaller uint's are more gas efficient.

0

15.10.2023

Bogdan Автор вопроса

SPooCK
It depends what you're trying to do and what you e...

for example this function function calculate(uint256 a, uint16 b) public view returns (uint256 memory) { uint256 result = a * b - a; return result; } is it safe?

0

15.10.2023

SPooCK

Bogdan
for example this function function calculate(uint...

That would depend on what you're calculating there, if its Token amounts, NO its not. For Tokens minimum use uint128.

0

15.10.2023

Bogdan Автор вопроса

SPooCK
That would depend on what you're calculating there...

yes, tokens

0

15.10.2023

SPooCK

What are you multiplying the Token amount with? I suppose this is a percentage? And always close your logic in brackets for any case uint256 result = (a * b) - a;

0

15.10.2023

Bogdan Автор вопроса

SPooCK
What are you multiplying the Token amount with? I ...

yes, it's like the loan calculator. User enters the amount of tokens and the percentage

0

15.10.2023

SPooCK

Bogdan
yes, it's like the loan calculator. User enters th...

Then its fine, if you dont expect "b" to ever go over 65,535, should work as good and even a soft stopper for anyone adding anything above.

0

15.10.2023

Bogdan Автор вопроса

SPooCK
Then its fine, if you dont expect "b" to ever go o...

thank you

0

15.10.2023

Mike Mike · Accepted Answer

Mike Mike

Unsigned integers (uint) are similar to integers, but they can only store positive values. Like integers, unsigned integers can be declared with a number of bits, such as uint8, uint16, uint32, uint64, and so on, up to uint256.

0

15.10.2023

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