# Convert u256 to string

**URL:** <https://forum.fuel.network/t/convert-u256-to-string/6059>\
**Category:** Sway\
**Created:** [June 26, 2024, 2:12pm UTC](https://forum.fuel.network/t/convert-u256-to-string/6059 "2024-06-26T14:12:44Z")\
**Posts on this page:** 1\
**Showing post:** 3

<div class="post-metadata">

**Author:** ![lokesh-lync](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.fuel.network/lokesh-lync/32/2902_2.png) [@lokesh-lync](https://forum.fuel.network/u/lokesh-lync)\
**Post date:** [June 27, 2024, 5:29am UTC](https://forum.fuel.network/t/convert-u256-to-string/6059/3 "2024-06-27T05:29:51Z")

</div>

hey @nick I am trying to concat a string and s u256. I was trying to do this: [Convert u64 to String for concatenation - #2 by Serafim](https://forum.fuel.network/t/convert-u64-to-string-for-concatenation/5254/2)

This is the relevent code that I wrote:

```auto
pub fn concat_str_with_num(s: String, num: u256) -> String {
    let mut result = Bytes::new();
    push_bytes(result, s.as_bytes());
    push_bytes(result, String::from_ascii_str("/").as_bytes()); // an arbitrary delimeter
    push_bytes(result, convert_num_to_ascii_bytes(num));
    String::from_ascii(result)
}

fn convert_num_to_ascii_bytes(num: u256) -> Bytes {
    let mut bytes = Bytes::new();
    let mut n = num;
    if n == 0 {
        bytes.push(48);
        return bytes;
    }
    while n != 0 {
        // 48 - is an ASCII offset for digits
        bytes.push(((n % 10) + 48).try_as_u8().unwrap());
        n /= 10;
    }
    let mut reversed_bytes = Bytes::with_capacity(bytes.len());
    while !bytes.is_empty() {
        reversed_bytes.push(bytes.pop().unwrap());
    }
    return reversed_bytes;
}

fn push_bytes(ref mut a: Bytes, b: Bytes) {
    let mut i = 0;
    while i < b.len() {
        a.push(b.get(i).unwrap());
        i = i + 1;
    }
}

```

I am getting this error:

```plaintext
    |
188 |
189 | // 48 - is an ASCII offset for digits
190 | bytes.push(((n % 10) + 48).try_as_u8().unwrap());
    | ^^^^^^^^^ No method named "try_as_u8" found for type "u256".
191 | n /= 10;
192 | }
    |
____

```

Is there some import that I am missing?

Here are my imports:

```auto
use std::primitive_conversions::u256::*;
use sway_libs::{
       ownership::{
        _owner,
        initialize_ownership,
        only_owner,
    },
    asset::metadata::*,
    reentrancy::*
};

use standards::{
    src5::{SRC5, State, AccessError},
    src20::SRC20,
    src7::{SRC7, Metadata}
};

use std::{
    asset::{
        burn,
        mint_to,
        transfer,
    },
    call_frames::{
        msg_asset_id,
    },
    constants::DEFAULT_SUB_ID,
    context::msg_amount,
    string::String,
    hash::Hash,
    storage::storage_map::StorageMap,
    storage::storage_string::StorageString,
    bytes::*
};

```

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