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  1. richard@richard-VirtualBox:~/Programming$ cat main.cpp
  2. #include <iostream>
  3.  
  4. int main()
  5. {
  6.     int getInteger();
  7.  
  8.     int x { getInteger() };
  9.     int y { getInteger() };
  10.  
  11.     std::cout << x << " + " << y << " is " << x + y << '\n';
  12.     return 0;
  13. }
  14. richard@richard-VirtualBox:~/Programming$ cat input.cpp
  15. #include <iostream>
  16.  
  17. int getInteger()
  18. {
  19.     std::cout << "Enter an integer: ";
  20.     int x{};
  21.     std::cin >> x;
  22.     return x;
  23. }
  24. richard@richard-VirtualBox:~/Programming$ g++ main.cpp -o main.o
  25. main.cpp: In function ‘int main()’:
  26. main.cpp:5:19: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
  27.     5 |     int getInteger();
  28.       |                   ^~
  29. main.cpp:5:19: note: remove parentheses to default-initialize a variable
  30.     5 |     int getInteger();
  31.       |                   ^~
  32.       |                   --
  33. main.cpp:5:19: note: or replace parentheses with braces to value-initialize a variable
  34. /usr/bin/ld: /tmp/ccRNaSLq.o: in function `main':
  35. main.cpp:(.text+0xd): undefined reference to `getInteger()'
  36. /usr/bin/ld: main.cpp:(.text+0x15): undefined reference to `getInteger()'
  37. collect2: error: ld returned 1 exit status
  38. richard@richard-VirtualBox:~/Programming$ 
  39.  
Not running #stdin #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
stdout 
Standard output is empty
https://ideone.com/SOZGea
language:
Text (text 6.10)
created:
266 days ago
visibility:
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