Compilare: user.c: In function ‘main’: user.c:32:5: warning: implicit declaration of function ‘malloc’ [-Wimplicit-function-declaration] point *p = malloc(sizeof(point) * n); ^ user.c:32:16: warning: incompatible implicit declaration of built-in function ‘malloc’ [enabled by default] point *p = malloc(sizeof(point) * n); ^ user.c:54:48: warning: ‘p2’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(fout, "%.6f\n", dist_float(p[p1], p[p2])); ^ user.c:54:41: warning: ‘p1’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(fout, "%.6f\n", dist_float(p[p1], p[p2])); ^