Compilare: user.cpp: In function ‘void read(int&)’: user.cpp:62:27: warning: suggest parentheses around comparison in operand of ‘|’ [-Wparentheses] while((c = getchar()) < 48 | c > 57) if(c == 45) sign = -1; ^ user.cpp:62:38: warning: operation on ‘c’ may be undefined [-Wsequence-point] while((c = getchar()) < 48 | c > 57) if(c == 45) sign = -1; ^ user.cpp:64:13: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] while(c > 47 & c < 58) n = n * 10 + c - 48, c = getchar(); ^ user.cpp: In function ‘int main()’: user.cpp:71:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("figuri.in", "r", stdin); ^ user.cpp:72:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("figuri.out", "w", stdout); ^