Compilare: user.cpp: In function ‘int main()’: user.cpp:10:12: warning: unused variable ‘pd’ [-Wunused-variable] int i, pd, pi, u1=0, M; ^ user.cpp:10:16: warning: unused variable ‘pi’ [-Wunused-variable] int i, pd, pi, u1=0, M; ^ user.cpp:7:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("parantezare.in", "r", stdin); ^ user.cpp:8:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("parantezare.out", "w", stdout); ^ user.cpp:11:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (i = 0, scanf("%c", &c); c != '\n'; ++i, scanf("%c", &c)) { ^ user.cpp:11:5: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (i = 0, scanf("%c", &c); c != '\n'; ++i, scanf("%c", &c)) { ^