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void func1 (int &x) {
   x = 9 * x;
}
 
void func2 (int v[]) {
   v[0] = 9 * v[0];
}
 
int main (void) {
   int x, v[2];
   x    = 111; 
   func1 (x); printf ("x: %d\n", x);
   v[0] = 111; 
   func2 (v); printf ("v[0]: %d\n", v[0]);
   return 0;
}

prog.c:1:17: error: expected ‘;’, ‘,’ or ‘)’ before ‘&’ token
 void func1 (int &x) {
                 ^
prog.c: In function ‘main’:
prog.c:12:4: warning: implicit declaration of function ‘func1’ [-Wimplicit-function-declaration]
    func1 (x); printf ("x: %d\n", x);
    ^~~~~
prog.c:12:15: warning: implicit declaration of function ‘printf’ [-Wimplicit-function-declaration]
    func1 (x); printf ("x: %d\n", x);
               ^~~~~~
prog.c:12:15: warning: incompatible implicit declaration of built-in function ‘printf’
prog.c:12:15: note: include ‘<stdio.h>’ or provide a declaration of ‘printf’

Standard output is empty