Compilare: user.cpp: In function ‘int main()’: user.cpp:25:19: warning: statement has no effect [-Wunused-value] for (j; j <= x; j++) ^ user.cpp:34:16: warning: statement has no effect [-Wunused-value] for (contor; contor < 10; contor++) ^ user.cpp:10:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("psychtraining.in", "r", stdin); ^ user.cpp:11:46: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("psychtraining.out", "w", stdout); ^ user.cpp:12:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^