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  1. #include <iostream>
  2. #include <string>
  3.  
  4. void buyCoffee(double& totSmall, double& totMedium, double& totLarge) 
  5. {
  6.     totSmall = 5;
  7.     totMedium = 10;
  8.     totLarge = 15;
  9. }
  10.  
  11. void print(const std::string& header, double totalSmall, double totalMedium, double totalLarge)
  12. {
  13.     std::cout << header << "\n";
  14.     std::cout << "totalSmall = " << totalSmall
  15.         << ", totalMedium = " << totalMedium
  16.         << ", totalLarge = " << totalLarge << "\n";
  17. }
  18.  
  19. int main() 
  20. {
  21.     // This uses explicit references as you had in your example with
  22.     // a correction to the second and third variables
  23.     {
  24.         double totalSmall = 0, totalMedium = 0, totalLarge = 0;
  25.  
  26.         print("Before: ", totalSmall, totalMedium, totalLarge);
  27.  
  28.         double& totSmall = totalSmall, & totMedium = totalMedium, & totLarge = totalLarge;
  29.         buyCoffee(totSmall, totMedium, totLarge);
  30.  
  31.         print("After: ", totalSmall, totalMedium, totalLarge);
  32.     }
  33.  
  34.     // This just passes the variables to the function
  35.     // Since the function accepts them by reference it modifies
  36.     // the original variable inside the function
  37.     {
  38.         double totalSmall = 0, totalMedium = 0, totalLarge = 0;
  39.  
  40.         print("Before: ", totalSmall, totalMedium, totalLarge);
  41.  
  42.         buyCoffee(totalSmall, totalMedium, totalLarge);
  43.  
  44.         print("After: ", totalSmall, totalMedium, totalLarge);
  45.     }
  46. }
  47.  
Success #stdin #stdout 0.01s 5552KB
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stdin
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Standard input is empty
stdout
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Before: 
totalSmall = 0, totalMedium = 0, totalLarge = 0
After: 
totalSmall = 5, totalMedium = 10, totalLarge = 15
Before: 
totalSmall = 0, totalMedium = 0, totalLarge = 0
After: 
totalSmall = 5, totalMedium = 10, totalLarge = 15
https://ideone.com/q3EWmJ
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
public

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