- #include <iostream> 
-   
- void foo(); // My function declaration 
-   
- int main() 
- { 
-     foo(); // To use this function it must be declared and defined 
-   
-     return 0; 
- } 
-   
- // The function definition 
- void foo() 
- { 
-     std::cout << "foo\n"; 
- } 
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