Compilare: user.cpp: In function ‘int main()’: user.cpp:53:66: warning: array subscript has type ‘char’ [-Wchar-subscripts] for (j = s1; j && semn[j] != '(' && prior[semn[j]] >= prior[s[i]]; --j) ^ user.cpp:53:81: warning: array subscript has type ‘char’ [-Wchar-subscripts] for (j = s1; j && semn[j] != '(' && prior[semn[j]] >= prior[s[i]]; --j) ^ user.cpp: In function ‘int operatie(int, int, char)’: user.cpp:24:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:28:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("evaluare.in","r",stdin); ^ user.cpp:29:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("evaluare.out","w",stdout); ^ user.cpp:31:26: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] s[0] = '('; gets(s+1); n = strlen(s); s[n] = ')'; ^ /tmp/ccvAMrso.o: In function `main': user.cpp:(.text.startup+0x5d): warning: the `gets' function is dangerous and should not be used.