Programming Examples for Looping and Repetition
Explore various programming examples illustrating loops and repetition constructs, including while loops, input validation, do-while loops, and for loops in languages such as pseudocode and Java.
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Presentation Transcript
Ps Loops and Repetition
Initial Problem int counter = 1 counter while (counter < 1000) { PRINT (counter + I will not ) counter++ } Ps
Initial Problem int counter = 1; while (counter <= 1000) { System.out.println (counter + I will not ); counter++; }
Pseudocode Input Validation Example userGuess = 0, secretNumber = 5 PRINT Enter a number between 1 and 10 READ userGuess WHILE (userGuess < 1 OR userGuess > 10) PRINT That is not between 1 and 10. Try again. READ userGuess ENDWHILE IF (userGuess == secretNum) THEN PRINT That s right! , userGuess, is the secret! ELSE PRINT userGuess, is not the secret! ENDIF Ps
Input ValidationExample public static void main (String[] args) { int userGuess = 0, secretNum = 5; Scanner scan = new Scanner (System.in); System.out.println("Enter a number between 1 and 10: "); userGuess = scan.nextInt(); while(userGuess < 1 || userGuess > 10) { System.out.println ("Not between 1 and 10. Try again!"); userGuess = scan.nextInt(); } if (userGuess == secretNum) { System.out.println(userGuess + " is the secret number!"); } else { System.out.println(userGuess + " isn t the secret number!"); } }
Pseudocode do-while Loop Example CREATE number = 0, lastDigit = 0, reverse = 0 PRINT Enter a positive number. READ number DO lastDigit = number % 10 reverse = (reverse * 10) + lastDigit number = number / 10 WHILE (number > 0) Ps ENDDO
Java - do-while Loop Example public static void main (String[] args) { int number, lastDigit, reverse = 0; Scanner scan = new Scanner (System.in); System.out.print ("Enter a positive integer: "); number = scan.nextInt(); do { lastDigit = number % 10; reverse = (reverse * 10) + lastDigit; number = number / 10; } while (number > 0); // NOTE THE SEMICOLON!!!!!!!!!!! System.out.println ("The reversed is " + reverse); } }
Pseudocode for Loop Example CREATE userChoice = 0 PRINT Choose a number to see the multiplication table. READ userChoice FOR (multiplier = 1, multiplier < 12, multiplier = multiplier + 1) PRINT userChoice, * , multiplier, = , (multiplier * userChoice) ENDFOR Ps
Java - for LoopExample public static void Main(String[] args) { int choice = 0; Scanner scan = new Scanner (System.in); System.out.println("Enter a number to see the table."); choice = scan.nextInt(); for(int multiplier = 1; multiplier <= 12; multiplier += 1) { System.out.println (multiplier + " * " + choice + " = " + (multiplier * choice)); } }
Pseudocode Nested for Loop Example CREATE maxRows = 10, row, star FOR (row = 1, row < maxRows, row = row + 1) FOR (star = 1, star <= row, star = star + 1) PRINT * ENDinnerFOR ENDouterFOR PRINTLINE () Ps
Java Nested for Loop Example public static void main (String[] args) { int maxRows = 10; for (int row = 1; row <= maxRows; row++) { for (int star = 1; star <= row; star++) { System.out.print ("*"); } System.out.println(); } }
