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I created a erc20 contract with a total supply of 40,000,000. 10 mil was sent to my wallet and 30 mil suppose to go to investors.

When someone invest, how can I send him tokens from my contract to his erc20 wallet?

Thanks.

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There is no such thing as ERC20 wallet, unless you have created your own.

The smart contract of your ERC20 token is a place where all tokens are and they are not travelling to other contracts and wallets. The way someone can actually have a number of tokens is just the the mapping usually called balances in which by query balances[address] you can receive amount of tokens this particular address hold.

When someone invest, how can I send him tokens from my contract to his erc20 wallet?

You just update the state by executing something like: 

balances[addr_of_investor] = amount_of_tokens;
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  • Where do I do that? balances[addr_of_investor] = amount_of_tokens;
    – Soher
    Jan 19, 2018 at 19:04
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    You will have to add this functionality to your contract, as it was just an example. For further read I suggest payable functions, fallback functions.
    – Roman Frolov
    Jan 19, 2018 at 19:15
  • @Soher No, you don't.
    – Roman Frolov
    Jan 19, 2018 at 20:21
  • Can I fix it if its already verified contract?
    – Soher
    Jan 19, 2018 at 20:26
  • If the contract is deployed you can’t change it, but you still can make changes in your code and deploy a new one.
    – Roman Frolov
    Jan 19, 2018 at 20:27

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