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#include <stdio.h> 
#include "stdlib.h"
#define ARRAY_IDX(type, array, i) ((type *)(array+i)) // you can only modify this line!
 
int main(int argc, const char * argv[]) {
    void *ptr = malloc(10*sizeof(int));
#ifdef ARRAY_IDX
    for (int i = 0; i < 10; i++) {
        ARRAY_IDX(int, ptr, i) = i * 2;
    }
 
    for (int i = 0; i < 10; i++) {
        printf("%d ", ARRAY_IDX(int, ptr, i));
    }
    free(ptr);
#else
    printf("Implement ARRAY_IDX first");
#endif
}

prog.c: In function 'main':
prog.c:9:32: error: lvalue required as left operand of assignment
         ARRAY_IDX(int, ptr, i) = i * 2;
                                ^
prog.c:13:16: warning: format '%d' expects argument of type 'int', but argument 2 has type 'int *' [-Wformat=]
         printf("%d ", ARRAY_IDX(int, ptr, i));
                ^

Standard output is empty