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Functions with Parameters and Return Values

Functions with Parameters and Return Values

Learn to divide a program into functions or subprograms in C#.

We'll cover the following...

Function with parameters

The parameters are the input values for the function enclosed in (), provided in the function call as arguments. Multiple parameters are separated by , and each parameter must have a data type.

static void showSum(int a, int b)
{
  System.Console.WriteLine(a + b);
}

The following function receives two int parameters and displays their sum.

showSum(5, 10);
C#
class Test
{
    static void showSum(int a, int b)
    {
      System.Console.WriteLine(a + b);
    }
    static void Main()
    {
      showSum(5 , 10);
    }
}

Array as a function parameter

An array can be received in a function as a parameter. The following program demonstrates the use of an array as a function parameter.

C#
class Test
{
    static void getSum(int[] nums)
    {
      int c = 0;
      for (int i = 0 ; i < nums.Length; i++)
      {
        c += nums[i];
      }
      System.Console.WriteLine(c);
    }
    static void Main()
    {
      int[] nums = {10, 20, 30, 40};
      getSum(nums);
    }
}

In the program above, the function receives an array int[] nums as a parameter. We need the size to traverse through each element of the array using arr.Length. We have used a for loop to calculate the sum of array elements in c and displayed it. In the Main() function, we declare an array of ...