Compilare: user.cpp: In function ‘int main()’: user.cpp:61:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("expresie.in", "r", stdin); ^ user.cpp:62:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("expresie.out", "w", stdout); ^ user.cpp:63:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&n); ^ user.cpp:65:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&a[i]); ^ user.cpp: In function ‘long long int produs2()’: user.cpp:28:24: warning: ‘poz2’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(i!=poz1 && i!=poz2) ^ user.cpp:28:13: warning: ‘poz1’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(i!=poz1 && i!=poz2) ^ user.cpp: In function ‘long long int produs3()’: user.cpp:54:17: warning: ‘poz’ may be used uninitialized in this function [-Wmaybe-uninitialized] i+=2; ^