Q.3: How to reverse the order of words in a given string?

 Ans.: The user will input a sentence and we need to reverse the sequence of words in the sentence.

• input: Welcome to Csharp corner, output: corner Csharp to Welcome

internal static void ReverseWordOrder(string str)

{

int i;

StringBuilder reverseSentence = new StringBuilder();

int Start = str.Length - 1;

int End = str.Length - 1;

while (Start > 0)

{

if (str[Start] == ' ')

{

i = Start + 1;

while (i <= End)

{

reverseSentence.Append(str[i]);

i++;

}

reverseSentence.Append(' ');

End = Start - 1;

}

Start--;

}

for (i = 0; i <= End; i++)

{

reverseSentence.Append(str[i]);

}

Console.WriteLine(reverseSentence.ToString());

}