How to call a function with params and check them

Question

I want to create a smart contract that users can send a number to and receive an amount of ether.

function airdrop(uint val) public payable {
    require(airdrop == true);
    if (val == 0x31){
        msg.sender.transfer(1 ether);    
        airdrop = false;
    }        
}

If users send a 1 they get the ether. How can I do this?

Answer 1

You can simply check val as a uint. Your code would look as follows:

function airdrop(uint val) public payable {
        require(airdrop == true);
        if (val == 1){
            msg.sender.transfer(1 ether);    
            airdrop = false;
        }        
    }