Looping Through Strings

1. Looping Through Strings

2. String Loops • Usually a for-loop – do you know why? • Where would the loop start? • Where would the loop stop?

3. What does it do? for(inti = 0; i< word.length(); i++){ char letter = word.charAt(i); System.out.println(letter); }

4. Running Totals • Sometimes our “running total” or “accumulator” variable should be a string. • Start it at “” • Use concatenation to add to it

5. Creating a String String word = “Happy”; String newWord = “”; for(inti = 0; i< word.length(); i++){ char letter = word.charAt(i); newWord = newWord + letter; }

6. Practice • Write a loop that takes a String and returns the string with all the e’s removed. For example, removeE(“elephant”) should return “lphant” • public String removeE(String word) • Write a loop that prints a word vertically. • public void verticalPrint(String word) • For example, verticalPrint(“Hey”) prints: Hey

7. CodingBat: No Loops • Warmup: • makeTags • left2 • right2 • hasBad • seeColor • Intermediate: • twoChar • endsLy • frontAgain • without2 • Tricky: • conCat • withoutX

8. CodingBat: Loops • Warmup: • doubleChar • countHi • Intermediate: • repeatEnd • sameStarChar • mixString • repeatSeparator • Tricky: • catDog • zipZap