extracted method with adding issue

ConsoleApp1/Program.cs

@@ -1,2 +0,0 @@
-// See https://aka.ms/new-console-template for more information
-Console.WriteLine("Hello, World!");

lab1_with_extracted_method/Program.cs

@@ -0,0 +1,61 @@
+using System;
+
+public class Lab1
+{
+    public static void Main(String[] args)
+    {
+        /*o1 = +
+         c3 = 0
+         o2 = *
+         c7 = short */
+
+        // var A = 4;
+        // short B = 3;
+        // var N = 10;
+        // var M = 10;
+        //
+        // var C = 1;
+        // var s = 0;
+        //
+        // bool divisionByZero=false;
+
+
+        Calculation(4, 3, 10, 10, 1, false);
+    }
+
+    public static void Calculation(int A, int C, int N, short B, int M, bool divisionByZero)
+    {
+        var s = 0;
+        if ((A <= -C && -C <= N) || (B <= 0 && 0 <= M))
+        {
+            Console.WriteLine("Division by zero!");
+            return;
+        }
+
+        for (int i = A; i <= N; i++)
+        {
+            if (i + C == 0)
+            {
+                Console.WriteLine("Division by zero!");
+                divisionByZero = true;
+                break;
+            }
+
+            for (short j = B; j <= M; j++)
+            {
+                if (j == 0)
+                {
+                    Console.WriteLine("Оскільки j = 0, то сума просто буде 0");
+                    break;
+                }
+
+                s += (i * j) / (i + C);
+            }
+        }
+
+        if (!divisionByZero)
+        {
+            Console.WriteLine($"s = {s};");
+        }
+    }
+}

laboratorna1/Program.cs

@@ -0,0 +1,52 @@
+using System;
+
+public class Lab1
+{
+    public static void Main(String[] args)
+    {
+        /*o1 = +
+         c3 = 0
+         o2 = *
+         c7 = short */
+
+         var A = 4;
+         short B = 3;
+         var N = 10;
+         var M = 10;
+
+         var C = 1;
+         var s = 0;
+
+         bool divisionByZero=false;
+
+
+        if ((A <= -C && -C <= N) || (B <= 0 && 0 <= M))
+        {
+            Console.WriteLine("Division by zero!");
+            return;
+        }
+      
+        for (int i = A; i <= N; i++)
+        {
+            if (i + C == 0) { 
+                Console.WriteLine("Division by zero!");
+                divisionByZero = true;
+                break; 
+            }
+            for (short j = B; j <= M; j++)
+            {
+                if (j == 0) {
+                    Console.WriteLine("Оскільки j = 0, то сума просто буде 0");
+                    break;
+                }
+                s += (i * j) / (i + C);
+            }
+        }
+
+        if (!divisionByZero)
+        {
+            Console.WriteLine($"s = {s};" );
+        }
+
+    }
+}