Method Calls

You can call other methods from within a method.

Methods are able to call other methods, and those methods can call even more methods. You can invoke multiple methods inside a single method. This makes our program expand like a tree growing upward, with the Main function acting as its root.

In English technical documents, call a method and invoke a method carry exactly the same meaning;

Calling syntax: MethodName(argument list). We will cover argument lists later.

Method invocation works exactly as shown in the image above. Calls stack layer by layer. Once a function finishes executing, control returns to where it was called, and the program continues running from that point.

Take a look at this example

class Program
{
    static void Main()
    {
        //Calculate formula (23+69)*5/(6-2)
        Program program = new Program();
        Console.WriteLine(program.CalculateExpression());
    }

    int CalculateExpression()
    {
        int result = Divide();
        return result;
    }

    int Add(int a, int b)
    {
        return a + b;
    }

    int Subtract(int a, int b)
    {
        return a - b;
    }

    int Multiply(int a, int b)
    {
        return a * b;
    }

    int Divide()
    {
        int res = Add(23, 69);
        return Multiply(res, 5) / Subtract(6, 2);
    }
}
Code language: C# (cs)

In the sample above, the Main function calls CalculateExpression. CalculateExpression then calls Divide. Inside Divide, we first run Add, followed by Multiply and Subtract, before finishing the division calculation.

Method Calls