C# 0 The Complete Reference

ReadLine( )

 and uses 

Int32.Parse( )

to convert the string into an integer. Next, it inputs the values, using 

Double.Parse( )

 to convert 

the strings into their 

double

 equivalents.

// This program averages a list of numbers entered by the user.

using System;

using System.IO;

class AvgNums {

  static void Main() {

    string str;

    int n;

    double sum = 0.0;

    double avg, t;

    Console.Write("How many numbers will you enter: ");

    str = Console.ReadLine();

    try {

      n = Int32.Parse(str);

    } catch(FormatException exc) {

      Console.WriteLine(exc.Message);

      return;

    } catch(OverflowException exc) {

      Console.WriteLine(exc.Message);

      return;

    }

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    Console.WriteLine("Enter " + n + " values.");

    for(int i=0; i < n ; i++)  {

      Console.Write(": ");

      str = Console.ReadLine();

      try {

        t = Double.Parse(str);

      } catch(FormatException exc) {

        Console.WriteLine(exc.Message);

        t = 0.0;

      } catch(OverflowException exc) {

        Console.WriteLine(exc.Message);

        t = 0;

      }

      sum += t;

    }

    avg = sum / n;

    Console.WriteLine("Average is " + avg);

  }

}

Here is a sample run:

How many numbers will you enter: 5

Enter 5 values.

: 1.1

: 2.2

: 3.3

: 4.4

: 5.5

Average is 3.3

One other point: You must use the right parsing method for the type of value you 

are trying to convert. For example, trying to use