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pragma solidity ^0.5.10;

contract Demo1{

uint public data;

function setData(uint _data) public {
    data = _data;
}

}

contract Demo2{
function toSetData(Demo1 demo1,uint _data) public {
demo1.setData(_data);
}
}
pragma solidity ^0.5.10;

contract Demo1{
function setData(uint _data) public;
}

contract Demo3{
function toSetData(Demo1 demo1,uint _data) public {
demo1.setData(_data);
}
}