Compilare: user.cpp: In function ‘int main()’: user.cpp:16:6: warning: unused variable ‘t’ [-Wunused-variable] int t, a ,b, c, d, x, y, i; ^ user.cpp:16:15: warning: unused variable ‘c’ [-Wunused-variable] int t, a ,b, c, d, x, y, i; ^ user.cpp:16:18: warning: unused variable ‘d’ [-Wunused-variable] int t, a ,b, c, d, x, y, i; ^ user.cpp:16:27: warning: unused variable ‘i’ [-Wunused-variable] int t, a ,b, c, d, x, y, i; ^ user.cpp:18:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("inversmodular.in","r",stdin); ^ user.cpp:19:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("inversmodular.out","w",stdout); ^ user.cpp:21:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d ",&a, &b); ^