Compilare: user.cpp: In function ‘int solve(int)’: user.cpp:63:54: warning: operation on ‘copie’ may be undefined [-Wsequence-point] if (s[p]=='(')++p,v[++copie] = solve(copie+1); ^ user.cpp:64:59: warning: operation on ‘copie’ may be undefined [-Wsequence-point] else if (s[p]=='[')++p,v[++copie] = solve(copie+1); ^ user.cpp: In function ‘int main()’: user.cpp:73:38: 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:74:40: 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:76:14: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s+1); ^ /tmp/ccYppyrC.o: In function `main': user.cpp:(.text.startup+0x53): warning: the `gets' function is dangerous and should not be used.