Introduction
I have used Visual Studio 2012 for debugging purpose. But you can use any version of visul studio as per your availability..
Write a C# program to read a sentence and replace lowercase characters by uppercase and vice-versa
using System;
public class Stringexercise
{
public static void Main()
{
string str1;
char[] arr1;
int length, i;
length = 0;
char ch;
Console.Write("Enter the string : ");
str1 = Console.ReadLine();
length = str1.Length;
arr1 = str1.ToCharArray(0, length); // Converts string into char array.
Console.Write("\nAfter conversion, the string is: ");
for (i = 0; i < length; i++)
{
ch = arr1[i];
if (Char.IsLower(ch)) // check whether the character is lowercase
Console.Write(Char.ToUpper(ch)); // Converts lowercase character to uppercase.
else
Console.Write(Char.ToLower(ch)); // Converts uppercase character to lowercase.
}
Console.ReadLine();
}
}Result
