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#include <iostream>
using namespace std;
 
 
int glob = 0; // Kαθολική (public)
 
 
int F(int x){
 
  int num = 0;	// Τοπική (local)
  glob += 10;
  num = glob + x;		
  glob = val;	// ΣΦΑΛΜΑ
 
return num;
}
 
 
int main(){
 
  int val = 0;	// Τοπική (local)
  cin >> val;  
  cout << num << endl;  	// ΣΦΑΛΜΑ
  cout << x << endl;		// ΣΦΑΛΜΑ
  cout << glob << endl; 	// OK
  cout << F(val) << endl; 
 
return 0;
}
 

prog.cpp: In function ‘int F(int)’:
prog.cpp:13:10: error: ‘val’ was not declared in this scope
   glob = val; // ΣΦΑΛΜΑ
          ^~~
prog.cpp: In function ‘int main()’:
prog.cpp:23:11: error: ‘num’ was not declared in this scope
   cout << num << endl;   // ΣΦΑΛΜΑ
           ^~~
prog.cpp:24:11: error: ‘x’ was not declared in this scope
   cout << x << endl;  // ΣΦΑΛΜΑ
           ^

Standard output is empty