Debugging C Program

Debugging Your Program
In the computer world, program errors are also called bugs. In many cases, your C compiler and linker do not find any errors in your program, but the result generated by running the executable file of the program is not what you expect. In order to find those "hidden" errors in your program, you may need to use a debugger.

Normally, your C compiler vendor already includes a debugger software program in the C compiler package. The debugger can execute your program one line at a time so that you can watch closely what's going on with the code in each line, or so that you can ask the debugger to stop running your program on any line. For more details about your debugger, refer to the manuals made by your C compiler vendor.

Later in this book, you'll learn that debugging is a very necessary and important step in writing software programs. (This topic is covered in Hour 24, "What You Can Do Now.")

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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) {



                                
                        



                  
              
              
              
                                              
                              Question and Answer
                          
                                                                Question and Answer



    Q How does a for loop work?



                                
                        



                  
              
              
              
                                              
                              Exercises : Answer the following Question
                          
                                                                To help you solidify your understanding of this hour's lesson, you are encouraged to try to answer the quiz questions and finish the exercises provided in the Workshop before you move to the next lesson.



                                
                        



                  
              
              
              
                                              
                              Working with the Cast Operator
                          
                                                                Playing with the Cast Operator



In C, you can convert one data type to a different one by prefixing the cast operator to the operand.



The general form of the cast operator is



(data-type)x



                                
                        



                  
              
              
              
                                              
                              Question and Answer
                          
                                                                Question and Answer



    Q What is the difference between the pre-increment operator and the post-increment operator?


  
        
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