Functions in Solidity

Function-in-solidity.sol

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.5.0 <0.9.0;

// code for view type function
contract sample {
    uint s = 10;

    function f_name(uint _a) public view returns (uint) {
        return _a + block.number;
    }
}

// code for pure type function
contract sample_pure {
    function sample_p (uint _age) public pure returns (bool) {
        if (_age > 60) // to check senior citizen
            return true;
        else
            return false;
    }
}

// One liner function
contract Test {

    function f(uint a) private pure returns (uint) { return a + 1; }
}