Strings

Question 1

Given a string, how to determine if its permutation could form a palindrome ?

Answer 1

If a string with an even length is a palindrome, every character in the string must always occur an even number of times. If the string with an odd length is a palindrome, every character except one of the characters must always occur an even number of times

Question 2

What function determines that character is a letter or digit?

Answer 2

Char.IsLetterOrDigit(‘c’);

Question 3

What character function converts the character to lower case?

Answer 3

Char.ToLower(‘c’);

Question 4

How to reverse the string in C#?

Answer 4

char[] charArray=str.ToCharArray();
Array.Reverse(charArray);
string reversedString=new string(charArray);

Question 5

Given integer, how to get its corresponding character?

Answer 5

(char)number

Question 6

What is the string Builder.Remove signature looks like?

Answer 6

Remove (int startIndex, int length);

Question 7

Can we use foreach with string builder?

Answer 7

foreach statement cannot operate on variables of type ‘StringBuilder’ because ‘StringBuilder’ does not contain a public instance definition for ‘GetEnumerator’