# C# Program to find Sum of A.P. Series

The Program in C# Program to find Sum of A.P. Series is given below:

``````using System;

namespace AP_Series_Sum
{
class Program
{
static void Main(string[] args)
{
int a, d, n;
double sum;

Console.WriteLine("Hello Codeauri Family,enter the first term of the AP series: ");

Console.WriteLine("Similarly, enter the common difference of AP series: ");

Console.WriteLine("Then, the number of terms in the AP series: ");

sum = (n * (2 * a + (n - 1) * d)) / 2;

Console.WriteLine("Okay, the sum of the AP series is: " + sum);

}
}
}
``````

## Output:

Hello Codeauri Family,enter the first term of the AP series: 1
Similarly, enter the common difference of AP series:
3
Then, the number of terms in the AP series:
2
Okay, the sum of the AP series is: 5

## Pro-Tips💡

Here are the step by step execution of above program:

1. The first line `using System;` is a directive that tells the compiler to include the System namespace in the program, which is required to use the `Convert` class.
2. The program has a class named `Program` that contains the `Main` method. The `Main` method is the entry point of the program.
3. In the `Main` method, three integer variables `a`, `d`, and `n` are declared to store the first term of the AP series, the common difference, and the number of terms in the series, respectively.
4. The `sum` variable is declared as a double to store the sum of the AP series.
5. The `Console.WriteLine` method is used to prompt the user to enter the first term of the AP series, the common difference, and the number of terms in the series.
6. The `Convert.ToInt32` method is used to convert the input string to an integer and store it in the appropriate variable.
7. The sum of the AP series is calculated using the formula `sum = (n * (2 * a + (n - 1) * d)) / 2`.
8. The `Console.WriteLine` method is used to display the sum of the AP series.
9. The `Console.ReadLine` method is used to wait for the user to press the Enter key before closing the program.

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