0008.2

Definition: Debugging is the process of finding and fixing errors in program code.

Definition: Factoring (Decomposition) is the breaking of a complex task to its atomized sub parts. The goal of factoring is to reach a level of detail that can be represented in an algorithm and eventually programming code.  

Definition: Refactoring – Changing program code’s structure to improve readability or efficiency without changing it’s behavior; or, to change a code’s factoring

Instructions

Copy and paste the following code into the main.c file of  a new project:

#include <stdio.h>
#include <stdlib.h>
#include <math.h>


int main()
{
    float a,b,c,D,root1,root2;

    printf("Please enter a value for a...\n");
    scanf("%f",a);

    printf("Please enter a value for b...\n");
    scanf("%f",&b);

    printf("Please enter a value for c...\n");
    scanf("%f",&c);

    printf("\n");

    D=(b*b)-(4*a*c);


    if(D<0)
    {
        printf("no roots\n Exiting program...\n");
    }
    else if (D=0)
    {
        root1=(b*b)/(2*a);
        printf("Equation has only one root = %.2f \n Exiting program...\n ");

    }
    else
    {
        root1=((b*b)-sqrt(D))(2*a);
        root2=((b*b)+sqrt(D))/(2*a);
        printf("Roots are %.2f and %.2f \n Exiting program...\n",root1,root2);

    }
    return 1;




}

1. Debug your program so that it produces correct results in all cases.
2. Modify your code to use functions.
   • Move the code for calculating the Discriminant into another function. Do this by
     • Create a new function,which returns the value of the discriminant. The new function should implement the function declaration: float discriminant (acoef,bcoef,ccoeff);
     • Change the line which contains
       D=(b*b)-(4*a*c); to D=discriminant(a,b,c);
       
   • Move the code for calculating root 1 and root 2 into 2 separate functions. To do this, you must create suitable function declarations and accompanying function declarations which can accomplish the task.

© 2020  Vedesh Kungebeharry. All rights reserved. 

0007.(1 and 2)

Attempt the 2 c programming exercises below.  If you are having a hard time starting, try:

1. Examining the solution the exercise 2 for guidance.
2. Attempt exercise 1 (no solution was provided here)
3. Ideally, attempt exercise 2 without looking at the solution.

Exercises:

1. Create a program which accepts the radius for a circle/sphere  and outputs the volume and maximum cross sectional area.  Your program must prompt for input, and produce relevant results.

2. Given the coefficient  a b and c of a quadratic equation in the form y=ax^2+bx+c output the solution to the equation when y=0

Solution to Find the roots of a Quadratic Equation:

#include <stdio.h>
#include <stdlib.h>
#include <math.h>


int main()
{
    float a,b,c,D,root1,root2;


    printf("Please enter a value for a...\n");
    scanf("%f",&a);

    printf("Please enter a value for b...\n");
    scanf("%f",&b);

    printf("Please enter a value for c...\n");
    scanf("%f",&c);

    printf("\n");

    D=(b*b)-(4*a*c);


    if(D<0)
    {
        printf("no roots\n Exiting program...\n");
    }
    else if (D==0)
    {
        root1=(-b)/(2*a);
        printf("Equation has only one root = %.2f \n Exiting program...\n ");

    }
    else
    {
        root1=((-b)-sqrt(D))/(2*a);
        root2=((-b)+sqrt(D))/(2*a);
        printf("Roots are %.2f and %.2f \n Exiting program...\n",root1,root2);

    }
    return 1;




}

Strategy for Coding using Exercise 1 as an example

© 2020  Vedesh Kungebeharry. All rights reserved.