| Title | Topics | Action | |||
|---|---|---|---|---|---|
| 179 | String LengthA string is given. Print how many characters it has using `.Length`.
For "Hello... | easy | ○ Not Started | Strings | Solve |
| 180 | To UppercaseA string is given. Print it in all uppercase using `.ToUpper()`.
For "hello" th... | easy | ○ Not Started | Strings | Solve |
| 181 | To LowercaseA string is given. Print it in all lowercase using `.ToLower()`.
For "SHOUT" th... | easy | ○ Not Started | Strings | Solve |
| 182 | First CharacterA string is given. Print its first character using indexing `[0]`.
For "Hello" ... | easy | ○ Not Started | Strings | Solve |
| 183 | Last CharacterA string is given. Print its last character.
For "Hello" the program prints o.... | easy | ○ Not Started | Strings | Solve |
| 184 | SubstringA string is given. Print its first 3 characters using `.Substring(0, 3)`.
For "... | easy | ○ Not Started | Strings | Solve |
| 185 | Contains a SubstringA string is given. Print whether it contains "ell" using `.Contains` (prints Tru... | easy | ○ Not Started | Strings | Solve |
| 186 | Replace CharactersA string is given. Replace every 'l' with 'L' using `.Replace` and print the res... | easy | ○ Not Started | Strings | Solve |
| 187 | Index of a CharacterA string is given. Print the index of the first 'e' using `.IndexOf`.
For "Hell... | easy | ○ Not Started | Strings | Solve |
| 188 | Starts WithA string is given. Print whether it starts with "He" using `.StartsWith` (prints... | easy | ○ Not Started | Strings | Solve |
| 189 | Ends WithA string is given. Print whether it ends with "lo" using `.EndsWith` (prints Tru... | easy | ○ Not Started | Strings | Solve |
| 190 | Trim WhitespaceA string with surrounding spaces is given. Print it with the leading and trailin... | easy | ○ Not Started | Strings | Solve |
| 191 | Concatenate Two StringsTwo strings are given. Print them joined with a space between.
For "Hello" and ... | easy | ○ Not Started | Strings | Solve |
| 192 | Repeat a CharacterUse the `new string(char, count)` constructor to print the '*' character repeate... | easy | ○ Not Started | Strings | Solve |
| 193 | Build a Full NameA first and last name are given. Use string interpolation to print the full name... | easy | ○ Not Started | Strings | Solve |
| 194 | Compare Two StringsTwo strings are given. Print whether they are equal using `==` (prints True/Fals... | easy | ○ Not Started | Strings | Solve |
| 297 | How Long Is the Word?Every string keeps track of how many characters it holds through its Length prop... | easy | ○ Not Started | Strings | Solve |
| 298 | Shout It in UppercaseStrings can produce an all-capitals copy of themselves using the ToUpper method.... | easy | ○ Not Started | Strings | Solve |
| 299 | Quiet It Down to LowercaseJust as ToUpper makes a capitalized copy of a string, ToLower makes an all-lower... | easy | ○ Not Started | Strings | Solve |
| 300 | Grab the First Few LettersThe Substring method lets you pull out a smaller piece of a string. When you cal... | easy | ○ Not Started | Strings | Solve |
| 301 | Swap Cats for DogsThe Replace method returns a new string in which every occurrence of one piece o... | easy | ○ Not Started | Strings | Solve |
| 302 | Does It Have an At Sign?The Contains method checks whether a string includes a smaller piece of text and... | easy | ○ Not Started | Strings | Solve |
| 303 | Join First and Last NameYou can glue strings together with the + operator; this is called concatenation.... | easy | ○ Not Started | Strings | Solve |
| 492 | String InterpolationA string variable `name` is set to `"Sam"`. Use string interpolation (a `$"..."`... | easy | ○ Not Started | Strings | Solve |
| 493 | Split a StringThe string `"apple,banana,cherry"` contains three items separated by commas. Spl... | easy | ○ Not Started | Strings | Solve |
| 494 | Join Strings with a SeparatorAn array holds the pieces `"a"`, `"b"`, and `"c"`. Use `string.Join` to combine ... | easy | ○ Not Started | Strings | Solve |
| 495 | Pad Left with ZerosThe string `"42"` should be shown as a 5-character number with leading zeros. Us... | easy | ○ Not Started | Strings | Solve |
| 496 | Pad Right with SpacesPad the string `"Hi"` on the right with spaces to a total width of 5, then appen... | easy | ○ Not Started | Strings | Solve |
| 497 | Convert to a Char ArrayConvert the string `"code"` into a `char` array with `ToCharArray`, then print t... | easy | ○ Not Started | Strings | Solve |
| 498 | Check If a String Is EmptyA string `s` is set to `""` (empty). Use `string.IsNullOrEmpty` to check it and ... | easy | ○ Not Started | Strings | Solve |
| 499 | Trim Leading WhitespaceThe string `" hi"` has three leading spaces. Use `TrimStart` to remove them, t... | easy | ○ Not Started | Strings | Solve |
| 500 | Trim Trailing WhitespaceThe string `"hi "` has three trailing spaces. Use `TrimEnd` to remove them. Pr... | easy | ○ Not Started | Strings | Solve |
| 501 | Character to ASCII CodeThe `char` value `'A'` has an ASCII code. Cast it to an `int` to reveal that cod... | easy | ○ Not Started | Strings | Solve |
| 502 | Count the SpacesCount how many space characters are in the string `"a b c"` and print the total ... | easy | ○ Not Started | Strings | Solve |
| 503 | Insert Text into a StringThe string `"Helloworld"` is missing a space. Use `Insert` to add a single space... | easy | ○ Not Started | Strings | Solve |
| 504 | Remove Part of a StringThe string `"Hello World"` should keep only its first word. Use `Remove` startin... | easy | ○ Not Started | Strings | Solve |
| 195 | Count the VowelsA word is given. Count how many of its letters are vowels (a, e, i, o, u) and pr... | medium | ○ Not Started | Strings | Solve |
| 196 | Count a Specific CharacterA word is given. Count how many times the letter 'l' appears and print the count... | medium | ○ Not Started | Strings | Solve |
| 197 | Reverse a StringA word is given. Build its reverse with a loop (do not use a built-in reverse) a... | medium | ○ Not Started | Strings | Solve |
| 198 | Count WordsA sentence is given. Print how many words it has by splitting on spaces.
For "t... | medium | ○ Not Started | Strings | Solve |
| 199 | Capitalize First LetterA lowercase word is given. Print it with only the first letter capitalized.
For... | medium | ○ Not Started | Strings | Solve |
| 200 | Count Uppercase LettersA string is given. Count how many of its characters are uppercase letters and pr... | medium | ○ Not Started | Strings | Solve |
| 304 | Build the Uppercase InitialsCombine a few string tools to build someone's initials. You are given two lowerc... | medium | ○ Not Started | Strings | Solve |
| 305 | Capitalize the First LetterTake a fully lowercase word and capitalize only its first letter, leaving the re... | medium | ○ Not Started | Strings | Solve |
| 306 | Censor the Secret WordCombine Replace and Contains to censor sensitive text and then verify your work.... | medium | ○ Not Started | Strings | Solve |
| 505 | Count Digits in a StringRead one line of text from input and print how many of its characters are digits... | medium | ○ Not Started | Strings | Solve |
| 506 | Count ConsonantsCount the consonants in `"hello world"` — the alphabetic letters that are not vo... | medium | ○ Not Started | Strings | Solve |
| 507 | Remove All VowelsRemove every vowel (both cases of `a`, `e`, `i`, `o`, `u`) from `"Hello World"`,... | medium | ○ Not Started | Strings | Solve |
| 508 | Convert to Title CaseCapitalize the first letter of each word in `"hello world"`, leaving the remaini... | medium | ○ Not Started | Strings | Solve |
| 509 | Swap the CaseSwap the case of every letter in `"Hello World"` — uppercase becomes lowercase a... | medium | ○ Not Started | Strings | Solve |
| 510 | Extract the First WordRead one line of text and print only its first word — the part before the first ... | medium | ○ Not Started | Strings | Solve |
| 511 | Get the InitialsTake the first letter of each word in `"John Fitzgerald Kennedy"`, uppercase it,... | medium | ○ Not Started | Strings | Solve |
| 512 | Count Substring OccurrencesCount how many times the substring `"ab"` appears in `"abcabcab"`, searching lef... | medium | ○ Not Started | Strings | Solve |
| 201 | Is It a PalindromeA word is given. Print 'Yes' if it reads the same forwards and backwards, otherw... | hard | ○ Not Started | Strings | Solve |
| 202 | Most Frequent CharacterA string of lowercase letters is given. Print the character that appears most of... | hard | ○ Not Started | Strings | Solve |
| 203 | Reverse the WordsA sentence is given. Print its words in reverse order (the words themselves stay... | hard | ○ Not Started | Strings | Solve |
| 513 | Check for AnagramsTwo words are anagrams when they contain exactly the same letters rearranged. De... | hard | ○ Not Started | Strings | Solve |
| 514 | Run-Length EncodingCompress `"aaabbc"` using run-length encoding: replace each run of the same char... | hard | ○ Not Started | Strings | Solve |
| 515 | Find the Longest WordSplit `"I love programming challenges"` into words and print the single longest ... | hard | ○ Not Started | Strings | Solve |
| 516 | Caesar CipherEncrypt `"hello"` with a Caesar cipher that shifts each letter forward by 3 plac... | hard | ○ Not Started | Strings | Solve |