How to transfer/send ether in solidity. transfer(), send(), call() function introduction in solidity.

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S O L I D I T Y
S E N D E T H E R S

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How we can do ?
How we can send
ether to contract ?

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Send Ethers
There are mainly three ways to send ether in solidity.
using transfer function
using send function
using call function

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Send Ethers- transfer
This is used to transfer the ether. This is recommended.
pragma solidity ^0.4.20;
contract first{
function() payable { }
function getBalance() public returns(uint){
return address(this).balance;
}
}
contract second{
function send(address _add)public payable{
_add.transfer(msg.value);
}
}

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Send Ethers- transfer
This method has 2300 gas limit.
This throw exception and revert the state if unsuccessful which is not the case with
send and call.
No possibility to add gas limit as of now but this may be expected in future release.

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Send Ethers- send
This is used to send the ether.
pragma solidity ^0.4.20;
contract first{
function() payable { }
function getBalance() public returns(uint){
return address(this).balance;
}
}
contract second{
function send(address _add)public payable{
require(_add.send(msg.value));
}
}

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Send Ethers- send
This method also has 2300 gas limit.
This does not throw exception but return false if unsuccessful and true in case
successful. It does not revert the state until we use require function.
No possibility to add gas limit.

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Send Ethers- call
This is used to send the ether and this should be used as last option.
pragma solidity ^0.4.20;
contract first{
function() payable { }
function getBalance() public returns(uint){
return address(this).balance;
}
}
contract second{
function send(address _add)public payable{
require( _add.call.value(1 ether).gas(20317)());
}
}

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Send Ethers- call
This method support setting gas and does not limit to 2300.
This does not throw exception but return false if unsuccessful and true in case
successful. It does not revert the state until we use require function.