C#: Adding 3 numbers using the data type int and print their sum

Question

Here is my code in C#: Once this program runs it easily terminates and I can't see its output, can someone tell me what's wrong with this code?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static int sum(int num1, int num2, int num3)
        {
            int total;
            total = num1 + num2 + num3;
            return total;
        }
        static void Main(string[] args)
        {
            Console.Write("\n\nFunction to calculate the sum of two numbers :\n");
            Console.Write("--------------------------------------------------\n");
            Console.Write("Enter a number1: ");
            int n1 = Convert.ToInt32(Console.ReadLine());
            Console.Write("Enter a number2: ");
            int n2 = Convert.ToInt32(Console.ReadLine());
            Console.Write("Enter a number3: ");
            int n3 = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("\nThe sum of three numbers is : {0} \n", sum(n1, n2, n3));
        }
    }
}

looks fine. what's the problem? a compiler error -> which? a runtime exception -> call stack? — Cee McSharpface, Jan 18 '19 at 10:57
You can't see anything because your program terminates immediately after the last Console.WriteLine. Just add a Console.ReadLine() after the last line and you will have the time to read the result — Steve, Jan 18 '19 at 10:57

score 8 · Answer 1 · answered Jan 18 '19 at 10:58

8

You need something that would prevent console window close like Console.ReadKey() at the end of your program.

answered Jan 18 '19 at 10:58

opewix

4,993
1
20
42

Kunal Moharir · Answer 2 · 2019-01-18T11:02:50.963

0

Main() method is required in a public class.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        public static int sum(int num1, int num2, int num3)
        {
            int total;
            total = num1 + num2 + num3;
            return total;
        }
        public static void Main(string[] args)
        {
            Console.Write("\n\nFunction to calculate the sum of two numbers :\n");
            Console.Write("--------------------------------------------------\n");
            Console.Write("Enter a number1: ");
            int n1 = Convert.ToInt32(Console.ReadLine());
            Console.Write("Enter a number2: ");
            int n2 = Convert.ToInt32(Console.ReadLine());
            Console.Write("Enter a number3: ");
            int n3 = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("\nThe sum of three numbers is : {0} \n", sum(n1, n2, n3));
        }
    }
}

Check here : https://dotnetfiddle.net/p9E9Rw

edited Jan 18 '19 at 11:02

answered Jan 18 '19 at 11:00

Kunal Moharir

55
1
7

2

Public Main() method is not required in a public class – Merhat Pandzharov Jan 18 '19 at 11:02
2

that is not quite true, and it achieves [something else](https://stackoverflow.com/q/13680541/1132334), – Cee McSharpface Jan 18 '19 at 11:02
Check the Link which I shared. It seems to be working – Kunal Moharir Jan 18 '19 at 11:06
interesting. .net fiddle really fails to build OP code saying, 'Fatal Error: Public Main() method is required in a public class'. VS 2017 on 4.7.1 compiles just fine without making anything public. – Cee McSharpface Jan 18 '19 at 11:25

score 0 · Answer 3 · answered Jan 18 '19 at 11:01

0

Run the program using CTRL + F5

answered Jan 18 '19 at 11:01

Merhat Pandzharov

175
7

score 0 · Answer 4 · answered Jan 18 '19 at 11:22

0

You need to add the console code Console.ReadKey(); after the Console.WriteLine code.

You can also use the Console.ReadLine(); code, after the Console.WriteLine code.

So it waits for you to press a key before shutting down the Console Window.

answered Jan 18 '19 at 11:22

S. Dauda

1
1

C#: Adding 3 numbers using the data type int and print their sum

4 Answers4