Question

Fill in the blank for this common use of the for loop in processing each character of a string. for _____________________________________________________ {     char ch = str.charAt(i);     // process ch }

Insert the missing statement in the following code fragment prompting the user to enter a positive number.     double value;     do     {     System.out.print("Please enter a positive number: ");     value = in.nextDouble();     }     _____________________________________

The following for loop is executed how many times? for (x = 0; x <= 10; x++)

Consider the following for loop: for (i = 0; i < str.length(); i++) { ... } and the corresponding while loop: i = 0; while __________________________________ {     . . .     i++; } Fill in the blank for the while loop condition that is equivalent to the given for loop?

Write a for loop that is equivalent to the given while loop. i = 1; while (i <= 5) {     . . .     i++; }

Answer 1

1. for loop to process each character of a string:

For loop is used to traverse each character of the string where the process:

i. starts from charAt(0)

ii. end at charAt(last character of the string)

Below is the highlighted code for the loop to process the string

for(int I = 0; I < str.length(); i++)

{

    char ch = str.charAt(i);

    // process ch

}

EXAMPLE

Suppose the string str is “Example” which is to be printed by loop having a space in each character. Below is the full code with output:

String str = "Example";

          for(int i = 0; i < str.length(); i++) {

              char ch = str.charAt(i);

              System.out.print(ch+" ");

          }

Output:

-----------------------------------------

2. Please find added while condition with do loop:

double value;

    do

    {

    System.out.print("Please enter a positive number: ");

    value = in.nextDouble();

    }while(value<=0);

Example:

The above code will keep on asking the input until user enters a positive value as below, when 96 is entered the loop exists:

-----------------------------------------

3. The given loop has iterator variable x, which will be executed 11 times from 0 to 10

X’s starting value is = 0;

X’s ending value when the loop will be executed is 10

Please note 10 is included as condition is <=10

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4. Given for loop:

The for loop will traverse for each character of i from index 0 to index at its length-1.

Corresponding while loop is as below:

int i =0;

while (i< str.length())

{

    . . .

    i++;

}

EXAMPLE:

The sample code to print each character of string with while loop is as below:

int i =0;

          while (i< str.length())

          {

              char ch = str.charAt(i);

              System.out.print(ch+" ");

              i++;

          }

          Scanner in = new Scanner(System.in);

-----------------------------------------

5. The given while loop will start from int i = 1 to i <=5 and increment i for each iteration.

Corresponding for loop is as below:

for(int i = 1; i <=5; i++) {

                                                ....;

                                }

**Kindly comment if you need any clarification.