Compilare: user.cpp: In function ‘int main()’: user.cpp:16:21: warning: too many arguments for format [-Wformat-extra-args] printf("%d",a,"\n"); ^ user.cpp:6:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("euclid2.in","r",stdin); freopen("euclid2.out","w",stdout); ^ user.cpp:6:68: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("euclid2.in","r",stdin); freopen("euclid2.out","w",stdout); ^ user.cpp:7:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^ user.cpp:9:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d,%d",&a,&b); ^