Writing functions in solidity

A function is a unit of code designed to do a particular task within a larger contract. In this recipe, you will learn about creating and interacting with functions in solidity.

How to do it...

1. Create a function in solidity with the function keyword to perform a specific task. The following example demonstrates how we can create a simple function:

contract Test {
    function functionName() {
        // Do something
    }
}

2. Create another function to accept input parameters. These parameters can be declared just like variables. The following example accepts two parameters of type uint:

contract Test {
    function add(uint _a, uint _b) public {
        // Do something
    }
}

3. Define output parameters with the same syntax. The returns keyword is used to specify the return. The following function returns a variable of type uint:

contract Test {
    function add(uint _a, uint _b) public pure
        returns (uint sum)
    {
        sum = _a + _b;
    }   
}

4. Declare return...