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#include <iostream>
using namespace std;
 
void funcion(int &x);
 
int main(void) {
 
	int x=1;
 
	printf("%i\n", x);
 
	funcion(&x);
 
	printf("%i\n", x);
 
	return 0;
}
 
void funcion(int &x) {
	x++;
}

prog.cpp:10:2: error: use of undeclared identifier 'printf'
        printf("%i\n", x);
        ^
prog.cpp:12:2: error: no matching function for call to 'funcion'
        funcion(&x);
        ^~~~~~~
prog.cpp:4:6: note: candidate function not viable: no known conversion from 'int *' to 'int &' for 1st argument; remove &
void funcion(int &x);
     ^
prog.cpp:14:2: error: use of undeclared identifier 'printf'
        printf("%i\n", x);
        ^
3 errors generated.

Standard output is empty