Question

Create a program using C#, more specific a calculator where the user chooses addition, subtraction, addition. MUST use a FUNCTION, or METHOD. Each function use addition, subtraction, etc.

Answer 1

C# console application using functions

============================================================================================

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

namespace ConsoleApplication1
{
class Program
{
static double add(double x,double y)
{
return x + y;
}
static double sub(double x, double y)
{
return x - y;
}
static void Main(string[] args)
{
Console.WriteLine("=====Calculator=========");
int ch;
double a, b,c;
while(true)
{
Console.WriteLine("Press 1 for addition");
Console.WriteLine("Press 2 for subtraction");
Console.WriteLine("Press 3 for exit");
Console.WriteLine("Enter option");
ch = Convert.ToInt32(Console.ReadLine());

if(ch==1)
{
Console.Write("Enter 1st number: ");
a= Convert.ToDouble(Console.ReadLine());
Console.Write("Enter 2nd number: ");
b = Convert.ToDouble(Console.ReadLine());
c = add(a, b);
Console.WriteLine("addtion of {0} and {1} is: {2}", a, b, c);
}
else if(ch==2)
{
Console.Write("Enter 1st number: ");
a = Convert.ToDouble(Console.ReadLine());
Console.Write("Enter 2nd number: ");
b = Convert.ToDouble(Console.ReadLine());
c = sub(a, b);
Console.WriteLine("subtraction of {0} and {1} is: {2}", a, b, c);
}
else if(ch==3)
{
Environment.Exit(0);
}
}

}
}
}

============================================================================================

Output

Ouick Launch (Ctri-o) D ConsolcApplication1 (Running) Microsoft Visual Studio File Edit ViewProject l Debug Team Tools Test Analyze Window Hclp Sign in Debugy CPU Proccss (14420) ConsolcApplication1wshoLiforyclc Events Thread Stack Frame: ram.Main 1 EXE Program.CSX Calculator-. ress 1 for addition ch - Convert.Tolnt32 (Console.ReadLine)); ress 2 for subtraction 31 ress 3 for exit if(ch--1) 32 Fnter aption Console.Write("Enter 1st number: " a- Convert.ToDouble(Console.ReadLine)) Console.Write("Enter 2nd number: " b - Convert.ToDouble(Console.ReadLine)) c - add(, b): Console.WriteLine("addtion of {9} and {1) Enter 1st nunber: 23 35 Enter 2nd nunber:4 ddtion of 23 and 4 is: 27 36 ress 1 for addition 37 ress 2 for subtractian ress 3 for exit 38 Enter option 40 else if(ch--2) Enter 1st number: 4.5 Enter 2nd nunber: 5. subtraction of 4.5 and 5.6 is: -1.1 ress 1 for addition Console.Write("Enter 1st number: " a - Convert.ToDouble(Console.Readine()) Console.Write("Enter 2nd number: " b Convert.ToDnuble(Console.Readl ine()); c-sub(a, b); Console.WriteLine "subtraction of and ress 2 for subtraction 45 ress 3 for exit 16 Enter option 18 49 else if(ch--3) Environment.Exit(9) 52 Autos *0 Errors 초 ovarnings 100 Messages Search Error L ρ ype Entire Solution uild IntelliSense Code Description Autos Locals Vatch 1 Call Stack Brcakpoints Exception Scttings Command Window Immediatc Window Output Error List Ln 2 Publish 03:07 PM O Type here to search