The ABI of your warp’d Cairo contract is different for two reasons:
1. Cairo doesn’t allow overloading, so we append the EVM function selector of the function to its name to avoid collisions.
2. Cairo doesn’t have the same types as Solidity.

If you try to interact with your warp’d contracts through warp cli or hardhat- warp then it does the automatic ABI translation for you.

victorforissier.eth

Why abi of warp compiled contract does not match original solidity abi?

I’m having a problem where I’m trying to use a Uint256 in a hint, but I keep getting this error


Here is my code:


`%builtins output range_check`


`﻿`


`from starkware.cairo.common.uint256 import (uint256_add, Uint256,`


 `uint256_mul)`


`from starkware.cairo.common.serialize import serialize_word`


`﻿`


`func main{output_ptr : felt*, range_check_ptr}():`


 `alloc_locals`


 `let num1 = Uint256(20000, 0)`


 `%{print(ids.num1)%}`


 `let num2 = Uint256(low=0,high=7)`


 `let (local mul_low : Uint256, local mul_high : Uint256) = uint256_mul(num1, num2)`


 `serialize_word(mul_high.low)`


`﻿`


 `return ()`


`end`


ㅤ
_This question was originally posted on [Triality](https://triality.org/question/378)_

Cairo error "Expected expression of type 'starkware.cairo.common.uint256.Uint256' to have an address."

I'm implementing the new version and had a couple Q's:

- Is `useStarknetExecute` now the only transaction method (for multi and single calls).
- Do we update the transaction manager on our end? I seem to remember `useStarknetInvoke` also update this automatically

_This question was originally posted on [StarkNet Discord](https://www.newton.so/view?tags=discord)_

Questions about useStarknetExecute. Do we update the transaction manager on our end? [StarkNet/Cairo]

Everyone knows that secure code is essential. Can someone explain what is reentrancy?
I am curious about the reentrancy attack in StarkNet – is it a problem in Cairo Language and how to protect my smart contract from this attack?

How to protect my contract from reentrancy in Cairo Language / StarkNet?

I'm new to Cairo and I want to know what is the difference when I write `let x = 1;` and `tempvar x = 1;`. Is there any difference in Cairo Lang between let and tempvar?

Cairo: let vs tempvar what is the difference?

Hey, is there a unsigned_div_rem supporting dividing by 2**128 ?

_This question was originally posted on [StarkNet Discord](https://www.newton.so/view?tags=discord)_

Is there a unsigned_div_rem supporting dividing by 2**128 ?

How do you write the pseudocode:


if x == 1 and y == 1, then return 1.


Else return 0.


ㅤ
_This question was originally posted on [Triality](https://triality.org/question/767)_

How to write "and" conditional logic in Cairo?

**I want to put a disconnect button in my dapp, does anyone know how to do this on the frontend?**

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Why abi of warp compiled contract does not match original solidity abi?

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