# 2.1计数器(Counter)

The following is a simple example of a contract which implements a counter. Both the `initialize_counter()` and `increment_counter()` ABI methods return the currently set value.

以下是一个实现计数器的合约的简单示例。 `initialize_counter()` 和 `increment_counter()` ABI 方法都返回当前设置的值。

```
forc template --template-name counter my_counter_project

```

```
contract;

abi TestContract {
    #[storage(write)]
    fn initialize_counter(value: u64) -> u64;

    #[storage(read, write)]
    fn increment_counter(amount: u64) -> u64;
}

storage {
    counter: u64 = 0,
}

impl TestContract for Contract {
    #[storage(write)]
    fn initialize_counter(value: u64) -> u64 {
        storage.counter.write(value);
        value
    }

    #[storage(read, write)]
    fn increment_counter(amount: u64) -> u64 {
        let incremented = storage.counter.read() + amount;
        storage.counter.write(incremented);
        incremented
    }
}

```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://zenofchain.gitbook.io/sway-bian-cheng-yu-yan-geng-xin-zhong-the-sway-programming-languageupdatin/2.-shi-li-example/2.1-ji-shu-qi-counter.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.