Lab Assignment #4 :: CPTR 105 :: 04/03/09

1. Write a for statement to compute the sum 1 + 2² + 3² + 4² + ….. + n². Ask the user for the value of n.

Solution

    System.out.println("Please enter a number for the limit");
    Scanner kb = new Scanner(System.in);
    int n = kb.nextInt();
    int sum = 0;

    for (int count = 0; count <= n; count++) {
        sum += count*count;
    }

    System.out.println("The derived sum is " + sum);

2. Write a loop that will count the number of blank characters in a given string.

Solution

    System.out.println("Please enter a string:");
    Scanner kb = new Scanner(System.in);
    String inputString = kb.nextLine();

    int blanksCount = 0;

    for (int count = 0; count < inputString.length() - 1; count++) {
        if (inputString.charAt(count) == ' ')
            blanksCount++;
    }

    System.out.println("The number of blank characters is " + blanksCount);