what the difference of call another contract by interface?

by Smith Jone   Last Updated September 11, 2019 14:28 PM

 interface ERC20Interface {
   function transfer(address _to, uint256 _value) external; //A
   function transfer(address _to, uint256 _value) public returns (bool success); // B
   function transferFrom(address _from, address _to, uint256 _value) external;

What's the difference of A and B ?

Tags : solidity

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