Compilare: user.cpp: In function ‘int main()’: user.cpp:33:9: warning: unused variable ‘t’ [-Wunused-variable] int t,q,a,b,r; ^ user.cpp:33:11: warning: unused variable ‘q’ [-Wunused-variable] int t,q,a,b,r; ^ user.cpp:31:42: 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:32:44: 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:36:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^