Compilare: user.cpp: In member function ‘int Mare::zero()’: user.cpp:210:35: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] return A[0] == 0 || A[0] == 1 && A[1] == 0 ; ^ user.cpp: In member function ‘void Mare::radical_normal(Mare&, int)’: user.cpp:407:59: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if ( !C.zero () || i == 3 + ( X[0] % 2 == 0 ) && AUX ) { ^ user.cpp: In function ‘int main()’: user.cpp:435:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bubblesort.in", "r", stdin); ^ user.cpp:436:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bubblesort.out", "w", stdout); ^ user.cpp:439:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d ", &n, &m); ^ user.cpp:441:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(x); ^ /tmp/cchnmdJ5.o: In function `main': user.cpp:(.text.startup+0x72): warning: the `gets' function is dangerous and should not be used.