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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
- Anonymous2 weeks 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;
}
- EddieJLv 72 weeks 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.
- Anonymous2 weeks 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;
}
