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c++ fractions

mv81 (13)
Im writing a c++ program that uses fractions and im having trouble figuring out how i allow people to enter fractions into the program. I have it to were im asking people to enter the fraction but it doesn't allow me to.

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  #include <iostream>
#include <iomanip>
using namespace std;

int main()
{
    int     choice;
    double  fraction_a1,
            fraction_a2,
            fraction_s1,
            fraction_s2,
            fraction_m1,
            fraction_m2,
            fraction_d1,
            fraction_d2;
            
        
    const int   ADD_FRACTION = 1,
                SUBTRACT_FRACTION = 2,
                MULTIPLY_FRACTION = 3,
                DIVIDE_FRACTION = 4,
                Quit_Program = 5;
   
    
    cout << "\t\tFraction Calculator\n\n"
         << "1. Add Fractions\n"
         << "2. Subtract Fractions\n"
         << "3. Multiply Fraction\n"
         << "4. Divide Fraction\n"
         << "5. Quit Program\n\n"
         << "Enter Your choice: ";
    cin >> choice;
    
    if (choice == ADD_FRACTION)
    {
        cout <<" Enter First Fraction"<<endl;
        cin >> fraction_a1;
        cout <<"Enter Second Fraction"<<endl;
        cin >> fraction_a2;
        
    }        
 return 0;
}


Thank you in advance
mobotus (275)
Ask the user for a numerator and a denominator, do your math magic, then format your answer however you want your output to look like.
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