the vanilla `pow` should fallback to that one if the arg is an int. But you would need to multiply it by 2**61 before

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

Newton

Hey there, is there an existing Math64x61_pow implementation to compute power of a floating point elevated to an integer power?

edit: looks like there is 🙂
https://github.com/influenceth/cairo-math-64x61/blob/master/contracts/cairo_math_64x61/math64x61.cairo#L278

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

Is there a Cairo Lang implementation to compute power of a floating point?

What will the bundler ecosystem look like in AA?

---

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What will the bundler ecosystem look like in Account Abstraction?

How can I test on multi-chain with both Starknet and Ethereum?


ApeWorX: How can I test on multi-chain with both Starknet and Ethereum?

Why should I run a Pathfinder node?

Hello! This is day 8 of the 17 days of the Cairo Challenge. And I have no idea how to solve the [playground](https://www.cairo-lang.org/playground/) exercise “Field Elements”.  Perhaps you can help me?

```
// Unlike most systems where the primitive type is a 32 or 64-bit integer,
// the primitive type in Cairo is "felt", which stands for "field element".
// When we say "a field element" we mean an integer in the range -P / 2 < x < P / 2,
// where P is a very large (prime) number.
// Currently we use a 252-bit number (76 decimal digits).
// When we add, subtract or multiply and the result is outside the range above,
// there is an overflow.
//
// The most important difference between integers and field elements is division:
// Division of field elements (and therefore division in Cairo) is not the
// integer division you may be used to.
// In the next challenge, you'll see how to use unsigned_div_rem()
// for truncated (i.e., rounding down) integer division.
//
// Make the code below output the results of the following expressions:
// 1. 1 + 100, 1 - 100, 9 * 9.
// 2. pow(10, 74), pow(10, 75), pow(10, 76)
// 3. 12 / 3, (-12) / 3
// 4. 13 / 3 (This is an example of division in the field)

%builtins output

from starkware.cairo.common.serialize import serialize_word

// Computes base^exp.
func pow(base: felt, exp: felt) -> (res: felt) {
    if (exp == 0) {
        return (res=1);
    }

    let (res) = pow(base=base, exp=exp - 1);
    return (res=res * base);
}

func main{output_ptr: felt*}() {
    serialize_word(1 + 100);
    // Add your code here.

    return ();
}
```

---

> Answers to this question are a part of the ✨ 17 days of Cairo Lang with Playground & Newton. ✨
> 

*Vote for your favorite answer - the best answer will win a $10 award. A new day – a new reward! During the next 17 days, our goal is to attract more developers to the Cairo language and to systematize the knowledge of Cairo lang. [Read rules](https://www.notion.so/17-days-of-Cairo-Lang-with-Newton-550dfcda6a2d449ca468be293c776578)*

How to make math operation with Field Elements (felts) in Cairo lang?

Say I am calling the following function test. Why can I call with either of these function signatures and get the same result?


`func test{syscall_ptr : felt*}():`


or


`func test{syscall_ptr : felt*, range_check_ptr}():`


ㅤ
_This question was originally posted on [Triality](https://triality.org/question/413)_

Cairo: are builtins always needed to be expressed in function signature?

# I have a Solidity Smart contract like this:
```solidity
// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

/**
 * @title Storage
 * @dev Store & retrieve value in a variable
 */
contract Storage {

    uint256 number;

    /**
     * @dev Store value in variable
     * @param num value to store
     */
    function store(uint256 num) public {
        number = num;
    }

    /**
     * @dev Return value 
     * @return value of 'number'
     */
    function retrieve() public view returns (uint256){
        return number;
    }
}
``` 
## Which steps should I follow if I want to use kakarot?

How to use Kakarot for my Solidity Contracts?

How to get private key/mnemonic for account that been created using `deploy_account`?
or can i using existing 12 words mnemonic to create contract account?

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

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