> cat test.cpp && g++ test.cpp
#include <stdio.h>
void print_array (int[] a) {
        int laenge = sizeof(a) / sizeof(int);
        for (int i=0;i<laenge;i++) {
                printf("%d\n",a[i]);
        }
}
int main () {
        int a[2] = {1,2};
        print_array(a);
        return 0;
}

test.cpp:2: error: parse error before `)' token
test.cpp: In function `void print_array(...)':
test.cpp:3: error: `a' undeclared (first use this function)
test.cpp:3: error: (Each undeclared identifier is reported only once for each
   function it appears in.)