Compilare: main.cpp: In function 'int main()': main.cpp:78:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] { freopen("fractal.in", "r",stdin); ^ main.cpp:79:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("fractal.out", "w",stdout); ^ main.cpp:83:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &k, &y, &x); ^