Compilare: user.cpp: In function ‘int getNum(int&)’: user.cpp:23:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ind < strlen(s) && isNum(ind)) ^ user.cpp: In function ‘void solve1()’: user.cpp:30:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < strlen(s); i++) ^ user.cpp: In function ‘int eval(int&, char)’: user.cpp:68:13: warning: statement has no effect [-Wunused-value] for (ind; ind < strlen(s);) ^ user.cpp:68:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (ind; ind < strlen(s);) ^ user.cpp: In function ‘int main()’: user.cpp:100:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("expresie2.in", "r", stdin); ^ user.cpp:101:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("expresie2.out", "w", stdout); ^ user.cpp:103:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ /tmp/cc3Kmr14.o: In function `main': user.cpp:(.text.startup+0x53): warning: the `gets' function is dangerous and should not be used.