Submitted by tushar pramanick on Fri, 03/08/2013 - 00:25

To help solidify your understanding of this hour's lesson, you are encouraged to answer the quiz questions and finish the exercises provided in the Workshop before you move to the next lesson. The answers and hints to the questions and exercises are given in Appendix E, "Answers to Quiz Questions and Exercises."
Quiz

    Given x = 0, will the arithmetic operations inside the following if statement be performed?

    if (x != 0)
       y = 123 / x + 456;


    Given x = 4, y = 2, and operator = `-', what is the final value of x after the following switch statement is executed?

    switch (operator){
       case `+':  x += y;
       case `-':  x -= y;
       case `*':  x *= y;
       case `/':  x /= y;
       default:   break;
    }


    Similarly to in question 2, using x = 4, y = 2, and operator = `-', what is the final value of x after the following switch statement is executed?

    switch (operator){
       case `+':  x += y; break;
       case `-':  x -= y; break;
       case `*':  x *= y; break;
       case `/':  x /= y; break;
       default:   break;
    }


    What is the value of the integer variable x after the following code is executed?

    x = 1;
    for (i=2; i<10; i++){
       if (i%3 == 0)
          continue;
       x += i;
    }


Exercises

    Rewrite the program in Listing 10.1. This time, use the logical expression i%6 == 0 in the if statement.
    Rewrite the program in Listing 10.1 by using nested if statements.
    Write a program to read characters from the standard I/O. If the characters are A, B, and C, display their numeric values on the screen. (The switch statement is required.)
    Write a program that keeps reading characters from the standard input until the character q is entered.
    Rewrite the program in Listing 10.7. This time, instead of skipping 3 and 5, skip the integer that can be divided evenly by both 2 and 3.

Related Items

The Null Statement

The Null Statement

Looping Under the for Statement

Looping Under the for Statement

The general form of the for statement is

for (expression1; expression2; expression3) {
   statement1;
   statement2;
   .
   .
   .
}

Using Nested Loops

Using Nested Loops

You can put a loop inside another one to make nested loops. The computer will run the inner loop first before it resumes the looping for the outer loop.

Listing 7.7 is an example of how nested loops work.

 

The do-while Loop

The do-while Loop

You may note that in the for and while statements, the expressions are set at the top of the loop. However, in this section, you're going to see another statement used for looping,

The while Loop

The while Loop

The while statement is also used for looping. Unlike the situation with the for statement, there is only one expression field in the while statement.

The general form of the while statement is

while (expression) {