Question

Kathy, a software developer in FIT technologies, is assigned the task of optimizing the following
code:
using System;
public class SwapNumber
{
void SwapNum(ref int a, ref int b)
{
int temp;
temp = a;
a = b;
b = temp;
}
static void Main(string[] args)
{
SwapNumber classobj = new SwapNumber();
int Number1, Number2;
Console.WriteLine("Enter the first number");
Number1 = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Enter the second number");
Number2 = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("The value of first number is {0}",
Number1);
Console.WriteLine("The value of second number is {0}",
Number2);
classobj.SwapNum(ref Number1,ref Number2);
Console.WriteLine("Now the value of first number after
swaping is {0}", Number1);
Console.WriteLine("Now the value of second number after
swapping is {0}", Number2);
}
}
Optimize the preceding code for Kathy and find out the errors (if any). What would be the output of
the preceding code, if the first number is 46 while the second number is 37?

Answer 1

Here is the processed document with the code block restored and formatted:

Optimize the preceding code for Kathy and find out the errors (if any). What would be the output of the preceding code, if the first number is 46 while the second number is 37?

Solution:

Optimization methods for code:

- make the method "SwapNum" static, so you can use it without creating an instance of the class;

- initialize the variable in the same line as the variable declaration;

- use a try-catch construction for finding errors (incorrect data, program crashes, exceptions);

- Use "int.Parse" instead of "Convert.ToInt32", because when working with a format string "Convert.ToInt32", it uses "int.Parse".

Optimized code:

using System;
public class SwapNumber
{
static void SwapNum(ref int a, ref int b)
{
int temp = a;
a = b;
b = temp;
}
static void Main(string[] args)
{
try
{
Console.WriteLine("Enter the first number");
int Number1 = int.Parse(Console.ReadLine());
Console.WriteLine("Enter the second number");
int Number2 = int.Parse(Console.ReadLine());
Console.WriteLine("The value of first number is {0}", Number1);
Console.WriteLine("The value of second number is {0}", Number2);
SwapNum(ref Number1, ref Number2);
Console.WriteLine("Now the value of first number after swapping is {0}", Number1);
Console.WriteLine("Now the value of second number after swapping is {0}", Number2);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
}
Answer: