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  1. //@Author Damien Bell
  2. #include <iostream>
  3. #include <cmath>
  4. using namespace std;
  5.  
  6.  
  7. //double productSet(double, double);
  8. void passByValue(double, double);
  9. void passByRef(double &, double &);
  10.  
  11.  
  12. int main(){
  13.     double firstNumber=0, secondNumber=0, product=0;
  14.     char quit =' ';
  15.     while (quit != 'y'){
  16.  
  17.         cout <<"Please enter your first number: ";
  18.         cin >> firstNumber;
  19.  
  20.         cout << "\nPlease enter your second number: ";
  21.         cin >> secondNumber;
  22.  
  23.  
  24.        // product=productSet(firstNumber,secondNumber);
  25.  
  26.  
  27.         //cout << firstNumber<<endl; 
  28.         //cout << secondNumber<<endl;
  29.         //cout << product<<endl;
  30.  
  31.         passByValue(firstNumber, secondNumber);
  32.           cout << firstNumber<<endl; 
  33.           cout << secondNumber<<endl;
  34.         passByRef(firstNumber, secondNumber);
  35.           cout << firstNumber<<endl; 
  36.           cout << secondNumber<<endl;
  37.  
  38.  
  39.  
  40.  
  41.         cout <<"Do you want to quit? ";
  42.         cin >> quit;
  43.  
  44.  
  45.     }
  46.  
  47.  return 0;
  48. }
  49.  
  50. //double productSet(double firstNumberProd, double secondNumberProd){
  51. //    
  52. //    firstNumberProd +=10;
  53. //   secondNumberProd -=2;        
  54. //    double prodSet = firstNumberProd * secondNumberProd;
  55. //    return prodSet;
  56. //}//end function
  57.  
  58.  
  59. void passByValue(double first, double second){
  60.     first +=25;
  61.     second +=50;
  62. }
  63.  
  64. void passByRef(double &first, double &second){
  65.     first +=25;
  66.     second +=50;
  67. }
  68.  
stdin
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2
6
y
compilation info 
prog.cpp: In function ‘int main()’:
prog.cpp:13: warning: unused variable ‘product’
stdout
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Please enter your first number: 
Please enter your second number: 2
6
27
56
Do you want to quit?
https://ideone.com/kgnqZ
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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