C Programming Project Modification: (Please provide terminal output and comments

Question

C Programming Project Modification: (Please provide terminal output and comments)

This C program functions and operates properly, but I would like someone to add a few different programming topics to this program.

Here are the topics that you can utilize, please make sure that their are (6) topics from this list that are used throughout the program.

Topic List:( I know some of the topics are already in use, I would like to you add topics that are not in use )

Strings

2D Arrays

File I/O

Command Line Arguments

Pass by Reference

Structures

Linked Lists (Pointers)

Sorting

Recursion

Stack/Queue

Header Files

Source code of Program:

#include <math.h>

//function prototype declrations

void displayRoots1(double root1);

void displayRoots2(double realPart,double imaginaryPart);

void displayRoots3(double root1, double root2);

//structure declration

struct Roots

{

//memebr variables

double a, b, c;

double root1, root2;

double realPart, imaginaryPart;

};

//function defintion for computeRoots function

double computeRoots(struct Roots R)

{

    double determinant = R.b*R.b-4*R.a*R.c;

    // condition for real and different roots
    if (determinant > 0)
    {
        printf("Real and different roots. ");

R.root1 = (-R.b+sqrt(determinant))/(2*R.a);

        R.root2 = (-R.b-sqrt(determinant))/(2*R.a);

        displayRoots3(R.root1, R.root2);
    }

    //condition for real and equal roots
    else if (determinant == 0)
    {

        printf("Real and equal roots. ");

        R.root1 = R.root2 = -R.b/(2*R.a);

        displayRoots1(R.root1);

    }

    // if roots are not real
    else
    {

    printf("Imaginary roots. ");

    R.realPart = -R.b/(2*R.a);

    R.imaginaryPart = sqrt(-determinant)/(2*R.a);

    displayRoots3(R.realPart, R.imaginaryPart);

    }

}

//defintion for display functions

void displayRoots2(double root1, double root2)

{

printf("root1 = %.2lf and root2 = %.2lf ",root1 , root2);

}

void displayRoots1(double root1)

{

printf("root1 = root2 = %.2lf ", root1);

}

void displayRoots3(double realPart,double imaginaryPart)

{

printf("root1 = %.2lf+%.2lfi and root2 = %.2f-%.2fi ", realPart, imaginaryPart, realPart, imaginaryPart);

}

//start of the main function

int main()

{

//structure object declration

struct Roots R;

//variable declaration

double determinant, root1,root2;

//ask to input coefficients

printf("Enter coefficients a, b and c: ");

scanf("%lf %lf %lf",&R.a, &R.b, &R.c);

//function calling

computeRoots(R);

return 0;

}//end of the main program

Explanation / Answer

Topic List:

Please find the code below covering all these topics.

CODE

========================

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

//function prototype declrations

void displayRoots1(double root1);

void displayRoots2(double realPart,double imaginaryPart);

void displayRoots3(double root1, double root2);

//structure declration

struct Roots {
//memebr variables
double a, b, c;
double root1, root2;
double realPart, imaginaryPart;

};

//function defintion for computeRoots function

// Argument passed by Reference here
double computeRoots(struct Roots *R) {
double determinant = R->b*R->b-4*R->a*R->c;

// condition for real and different roots
if (determinant > 0){
printf("Real and different roots. ");
R->root1 = (-R->b+sqrt(determinant))/(2*R->a);
R->root2 = (-R->b-sqrt(determinant))/(2*R->a);
displayRoots3(R->root1, R->root2);
}

//condition for real and equal roots
else if (determinant == 0) {
printf("Real and equal roots. ");
R->root1 = R->root2 = -R->b/(2*R->a);
displayRoots1(R->root1);
}
// if roots are not real
else {
printf("Imaginary roots. ");
R->realPart = -R->b/(2*R->a);
R->imaginaryPart = sqrt(-determinant)/(2*R->a);
displayRoots3(R->realPart, R->imaginaryPart);
}
}

//defintion for display functions
void displayRoots2(double root1, double root2) {
// FILE I/O
FILE *fptr;
fptr = fopen("output.txt", "w");
  
if(fptr == NULL) {
printf("Error!");
exit(1);
}
  
fprintf(fptr, "root1 = %.2lf and root2 = %.2lf ",root1 , root2);
printf("root1 = %.2lf and root2 = %.2lf ",root1 , root2);
}

void displayRoots1(double root1) {
printf("root1 = root2 = %.2lf ", root1);
}

void displayRoots3(double realPart,double imaginaryPart) {
printf("root1 = %.2lf+%.2lfi and root2 = %.2f-%.2fi ", realPart, imaginaryPart, realPart, imaginaryPart);
}

//start of the main function
int main(int argc, char *argv[]) {
//structure object declration
struct Roots* R;
//variable declaration
double determinant, root1,root2;
  
// command line arguments
R->a = atof(argv[1]);
R->b = atof(argv[2]);
R->c = atof(argv[3]);
  
  
  
//function calling
computeRoots(R);
return 0;
}//end of the main program

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