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Anonymous
Anonymous asked in Computers & InternetProgramming & Design · 6 days ago

Can't figure out why this program won't run... (C++ hw help)?

#include<iostream>

using namespace std;

void menu(char&, int&, int&, int&, int&);

void addFraction(int, int, int, int, int&, int&);

void subtractFractions(char, int, int, int, int, int&, int&);

void multiplyFractions(char, int, int, int, int, int&, int&);

void divideFractions(char, int, int, int, int, int&, int&);

int gethcf(int, int);

void simplify(int&, int&);

bool wishContinue(int&);

int main() //Main function

{

 int n1 = 0;

 int n2 = 0;

 int n3 = 0;

 int d1 = 0;

 int d2 = 0;

 int d3 = 0;

 int result = 0;

 char operation;

 char slash = '/';

 menu(operation, n1, n2, d1, d2);

 while (operation != 0)

 {

  if (operation == '1') // Add fractions

   addFraction(n1, n2, d1, d2, n3, d3);

  else if (operation == '2') // Subtract fractions

   subtractFractions(operation, n1, n2, d1, d2, n3, d3);

  else if (operation == '3') // Multiply fractions

   multiplyFractions(operation, n1, n2, d1, d2, n3, d3);

  else if (operation == '4') // Divide fractions

   divideFractions(operation, n1, n2, d1, d2, n3, d3);

  cout << n3 << slash << d3 << endl;

 }

  menu(operation, n1, n2, d1, d2);

  return;

 }

3 Answers

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  • Anonymous
    6 days ago

    #include <iostream>

    using namespace std;

    // first you need a number

    struct number {

     int numerator;

     int denominator;

     number(): 

      numerator(0), 

      denominator(0)

     {

     }

     void simplify();

     void in();

     void out();

    };

    void number::simplify() //Euclids algorithm

    {

     int a, b;

     a = numerator;

     b = denominator;

     while (a != b)

     {

      if (a > b)

       a -= b;

      else

       b -= a;

     }

     numerator /= a;

     denominator /= a;

    }

    void number::in(){

      cout << "Enter the numerator: " << endl;

     cin >> numerator;

     cout << "Enter the denominator: " << endl;

     cin >> denominator;

    }

    void number::out(){

     cout << numerator << '/' << denominator;

    }

    enum Operation { ADD=1, SUBTRACT, MULTIPLY, DIVIDE, EXIT=9};

    Operation menu()

    {

    char c = 0;

    Operation operation;

    do {

      cout << "This program performs on integer fractions. Enter: \n"

    "1: To add fraction,\n"

     "2: To subtract fraction,\n"

    "3: To multiply fraction,\n"

    "4: To divide fraction, and\n"

     "9: To exit the program" << endl;

      cin >> c;

      operation = (Operation)(c-'0');

     }

      while (operation != MULTIPLY && operation != DIVIDE && operation != SUBTRACT && operation != ADD 

     && operation != EXIT);

     return operation;

    }

    void addFraction(number & n1, number & n2, number& n3)

    {

    n1.out();

     cout << '+';

     n2.out();

    cout << endl;

     n3.numerator = (n1.denominator * n2.numerator) + (n2.denominator * n1.numerator);

     n3.denominator = (n1.denominator * n2.denominator);

     n3.simplify();

     n3.out();

     cout << endl;

    }

    void subtractFractions(number & n1, number& n2, number& n3)

    {

    // n3.numerator = (d2 * n1) - (d1 * n2);

    // n3.denominator = (d1 * d2);

    // n3.simplify();

    }

    void multiplyFractions(number & n1, number& n2, number& n3)

    {

    // n3 = (n2 * n1);

    // d3 = (d1 * d2);

    // simplify(n3, d3);

    }

    void divideFractions(number&n1, number& n2, number& n3)

    {

    // n3 = (d2 * n1);

    // d3 = (d1 * n2);

    // simplify(n3, d3);

    }

    void exitProgram(){

    // char q; cout << "\nPress any key to Exit.";

    // cin.ignore(2, '\n');

    // cin.get(q);

    }

    int main() {

     number n1, n2, n3;

    Operation operation = EXIT;

    do {

     Operation operation = menu();

     cout << "For fraction 1" << endl;

     n1.in();

     cout << "For fraction 2" << endl;

     n2.in();

      if (operation == ADD) // Add fractions

       addFraction(n1, n2, n3);

      else if (operation == SUBTRACT) // Subtract fractions

       subtractFractions(n1, n2, n3);

      else if (operation == MULTIPLY) // Multiply fractions

       multiplyFractions(n1, n2, n3);

      else if (operation == DIVIDE) // Divide fractions

       divideFractions(n1, n2, n3);

     } while (operation != EXIT);

     return 0;

    }

  • EddieJ
    Lv 7
    6 days ago

    menu(operation, n1, n2, d1, d2);

      return;

    Your main program is declared as returning an <int> but your <return> statement does not supply a return value.

    Just above that, your call to menu () needs to be inside the <while> loop, otherwise, <operation> never changes and you will have an infinite loop (unless the user enters zero the first time.

  • Anonymous
    6 days ago

    (cont...)

    void simplify(int& numerator, int& denominator) //Euclids algorithm

    {

     int a, b;

     a = numerator;

     b = denominator;

     while (a != b)

     {

      if (a > b)

       a -= b;

      else

       b -= a;

     }

     numerator /= a;

     denominator /= a;

    }

    void menu(int& operation, int& n1, int& n2, int& d1, int& d2)

    {

     while (operation != '1' && operation != '2' && operation != '3' && operation != '4' && operation != '9')

     {

      cout << "This program performs on integer fractions. Enter: " << endl;

      cout << "1: To add fraction," << endl;

      cout << "2: To subtract fraction," << endl;

      cout << "3: To multiply fraction," << endl;

      cout << "4: To divide fraction, and" << endl;

      cout << "9: To exit the program" << endl;

      cin >> operation;

     }

     cout << "For fraction 1" << endl;

     cout << "Enter the numerator: " << endl;

     cin >> n1;

     cout << "Enter the denominator: " << endl;

     cin >> d1;

     cout << "For fraction 2" << endl;

     cout << "Enter the numerator: " << endl;

     cin >> n2;

     cout << "Enter the denominator: " << endl;

     cin >> d2;

     return;

    }

    void addFraction(char operation, int n1, int n2, int d1, int d2, int& n3, int& d3)

    {

     cout << n1 << " " << d1 << " " << n2 << " " << d2 << endl;

     n3 = (d1 * n2) + (d2 * n1);

     d3 = (d1 * d2);

     simplify(n3, d3);

     cout << " " << n3 << "/" << d3 << endl;

     return;

    }

    void subtractFractions(char operation, int n1, int n2, int d1, int d2, int& n3, int& d3)

    {

     n3 = (d2 * n1) - (d1 * n2);

     d3 = (d1 * d2);

     simplify(n3, d3);

     return;

    }

    void multiplyFractions(char operation, int n1, int n2, int d1, int d2, int& n3, int& d3)

    {

     n3 = (n2 * n1);

     d3 = (d1 * d2);

     simplify(n3, d3);

     return;

    }

    void divideFractions(char operation, int n1, int n2, int d1, int d2, int& n3, int& d3)

    {

     n3 = (d2 * n1);

     d3 = (d1 * n2);

     simplify(n3, d3);

     return;

    }

    void exitProgram(char operation)

    {

     char q; cout << "\nPress any key to Exit.";

     cin.ignore(2, '\n');

     cin.get(q);

     return;

    }

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