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void main(void) //All C++ projects need a main function
{
function1();
}
 
void function1() //A function that doesn't return anything when called
{
cout<<"Hello!\n";
cout<<function2();
}
 
int function2() //Returns an int when called
{
return 2;
}

prog.cpp:1:15: error: ‘::main’ must return ‘int’
 void main(void) //All C++ projects need a main function
               ^
prog.cpp: In function ‘int main()’:
prog.cpp:3:11: error: ‘function1’ was not declared in this scope
 function1();
           ^
prog.cpp: In function ‘void function1()’:
prog.cpp:8:1: error: ‘cout’ was not declared in this scope
 cout<<"Hello!\n";
 ^
prog.cpp:9:17: error: ‘function2’ was not declared in this scope
 cout<<function2();
                 ^

Standard output is empty