Question

Using PuTTY Linux Server

Task Compiling:

            1) Download the two files from blackboard, driver.cpp, and circle.h

            2) Create a new directory to store the files in

            3) Compile the code

a) Run the command g++ driver.cpp -o executable_name, this will compile the code both for driver.cpp and the referenced file circle.h

note: -o parameter specifies a new name for the executable, if you do not specify the “-o” parameter the default name of the executable is “a.out”

4) Using the error messages that the compiler gives you correct the syntax errors

5) repeat this process until all syntax errors are resolved.

           

            Compiling:

When compiling code, first the compiler checks the source files for syntax errors and link errors, if it finds any errors it displays them on the screen and aborts compiling the code.

Other Compilers such as Visual Studio, GCC/G++, and Eclipse function in a similar manor; one of the notable differences is in how they word the errors. Some errors messages may look similar and some may not.

The process to find the syntax errors is straightforward, every time you compile the code, the compiler will tell you the syntax errors.

Each syntax error will follow the same format

Logical errors on the other hand, a compiler cannot help you with, in these cases we use what is known as a debugger.

Debugging:

A debugger is an application that acts as a wrapper for the application execution, which gives the user/developer the ability to control execution of the program. A debugger gets a map of the application memory of the program, and the program counter, so the user can track the values of each variable after each line executes. The debugger works in conjunction with a compiler, when the source code is compiled, the compiler can generate symbols that the debugger uses in order to understand how to read the code. Without these symbols a debugger can not understand how to read the binary file.

Task Debugging:

            Debugging applications in Linux using the debugger known “gdb”

Reference: http://web.eecs.umich.edu/~sugih/pointers/gdbQS.html

1) Compile the code using “g++ driver.cpp –o executable_name –g”, this will Compile the code and create symbols for the debugger to use.

            2) Run gdb on your executable

                “gdb executable_name”

           

3) When in gdb(when you have a prompt that looks like (gdb)) type the command “start”

This will execute the code for the executable that you are working on.

4) Type “continue” to execute the next line of code in your executable.

If you hit an error the debugger quits the execution of the code,

5) Read the error messages and return to the bash shell by typing “quit” in gdb

            note:gdb will tell you exactly which line in the source code produced the error

6) Make the corrections to the code and re-compile the code.

7) Repeat this process until all logical errors are corrected.

PLEASE PROVIDE SCREENSHOTS AS WELL THANK YOU

Answer 1

Answer

#include <math.h>

#ifndef CIRCLE_H

#define CIRCLE_H

using namespace std;

class Circle

{

private:

double radius; //radius of the circle

double *area; //area of the circle

double *circumference; //circumferencee of the circle

static const double pi = 3.1415; // the value of pi

public:

Circle()

{

radius = 0;

area = new double;

*area = 0;

circumference = new double;

}

void set_rad(double rad) { radius = rad; };

double compute_area()

{

*area = (pi * pow(radius, 2.0));

return *area;

};

double compute_circumference()

{

*circumference = 2 * pi * radius;

return *circumference;

}

~Circle();

};

#endif

assignment.cpp

#include <iostream>

#include "circle.h"

using namespace std;

int main()

{

double users_radius; // value to store users given radius value;

Circle *first_circle; // define a pointer to a circle

first_circle = new Circle(); // allocate memory for the object and call the constructor

cout << "This Program computes various metrics of a circle" << endl; //Notify the user of what this program does

cout << "Please enter the radius of the circle:"; //prompt the user for the radius they want to set

cin >> users_radius;

first_circle->set_rad(users_radius);

cout << "Area of circle is:" << first_circle->compute_area() << endl; //calculate the area using comput_area and give results to the user

cout << "The circumference of the circle is:" << first_circle->compute_circumference() << endl; // calculate the circumference and give the results to the user

return 0;

}