Compilare: user.cpp: In function ‘void infixToPostfix(char*)’: user.cpp:38:27: warning: unused variable ‘k’ [-Wunused-variable] int N = strlen(exp)-1,k=0; ^ user.cpp: In function ‘int main()’: user.cpp:100:18: warning: unused variable ‘s1’ [-Wunused-variable] char s[100],*s1; ^ user.cpp: In function ‘int calc(int, int, char)’: user.cpp:33:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:98:37: 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:99:39: 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:101:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",s); ^