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One way is to use Remix, the browser-based Solidity realtime compiler and runtime Solidity (formerly named browser-solidity).

1. Paste the code in Remix.
2. Wrap the function inside a contract if needed. (Example: contract C { ... }.)
3. Click Create to instantiate the contract.
4. Enter the desired input next to the function.

• For bytes1 ... bytes32, use a quoted hex string, example "0xabcdef" for bytes3.
• For bytes, use an array of hex strings, example: ["0xab", "0xcd", "0xef"].
• For strings, make sure they are quoted.
• For large numbers, make sure they are quoted too.
• For an array, use [], example: ["hello", 42, "0xabcd"]

5. Click the function to get the Result. The Result is ABI encoded.

Here is an example screenshot:

One way is to use Remix, the browser-based Solidity realtime compiler and runtime Solidity (formerly named browser-solidity).

1. Paste the code in Remix.
2. Wrap the function inside a contract if needed. (Example: contract C { ... }.)
3. Click Contract tab and then Create to instantiate the contract.
4. Enter the desired input next to the function.

• For bytes1 ... bytes32, use a quoted hex string, example "0xabcdef" for bytes3.
• For bytes, use an array of hex strings, example: ["0xab", "0xcd", "0xef"].
• For strings, make sure they are quoted.
• For large numbers, make sure they are quoted too.
• For an array, use [], example: ["hello", 42, "0xabcd"]

5. Click the function to get the Result. The Result is ABI encoded.

Here is an example screenshot:

One way is to use the browser-based Solidity realtime compiler and runtime Solidity.

1. Paste the code in Solidity Browser.
2. Wrap the function inside a contract if needed. (Example: contract C { ... }.)
3. Click Create to instantiate the contract.
4. Enter the desired input next to the function.

• For bytes (and bytes1 ... bytes32), use a quoted hex string, example: "0xabcdef" would work for bytes or bytes3.
• For strings, make sure they are quoted.
• For large numbers, make sure they are quoted too.
• For an array, use [], example: ["hello", 42, "0xabcd"]

5. Click the function to get the Result. The Result is ABI encoded.

Here is an example screenshot:

EDIT: https://ethereum.github.io/browser-solidity is the new location

One way is to use Remix, the browser-based Solidity realtime compiler and runtime Solidity (formerly named browser-solidity).

1. Paste the code in Remix.
2. Wrap the function inside a contract if needed. (Example: contract C { ... }.)
3. Click Create to instantiate the contract.
4. Enter the desired input next to the function.

• For bytes1 ... bytes32, use a quoted hex string, example "0xabcdef" for bytes3.
• For bytes, use an array of hex strings, example: ["0xab", "0xcd", "0xef"].
• For strings, make sure they are quoted.
• For large numbers, make sure they are quoted too.
• For an array, use [], example: ["hello", 42, "0xabcd"]

5. Click the function to get the Result. The Result is ABI encoded.

Here is an example screenshot:

One way is to use the browser-based Solidity realtime compiler and runtime Solidity.

1. Paste the code in Solidity Browser.
2. Wrap the function inside a contract if needed. (Example: contract C { ... }.)
3. Click Create to instantiate the contract.
4. Enter the desired input next to the function.

• For bytes (and bytes1 ... bytes32), use a quoted hex string, example: "0xabcdef" would work for bytes or bytes3.
• For strings, make sure they are quoted.
• For large numbers, make sure they are quoted too.
• For an array, use [], example: ["hello", 42, "0xabcd"]

5. Click the function to get the Result. The Result is ABI encoded.

Here is an example screenshot:

EDIT: https://ethereum.github.io/browser-solidity is the new location

One way is to use the browser-based Solidity realtime compiler and runtime Solidity.

1. Paste the code in Solidity Browser.
2. Wrap the function inside a contract if needed. (Example: contract C { ... }.)
3. Click Create to instantiate the contract.
4. Enter the desired input next to the function.

• For bytes (and bytes1 ... bytes32), use a quoted hex string, example: "0xabcdef" would work for bytes or bytes3.
• For strings, make sure they are quoted.
• For large numbers, make sure they are quoted too.
• For an array, use [], example: ["hello", 42, "0xabcd"]

5. Click the function to get the Result. The Result is ABI encoded.

Here is an example screenshot:

EDIT: https://ethereum.github.io/browser-solidity is the new location