Compilare: user.cpp: In function ‘int main()’: user.cpp:25:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int n; fscanf(in, "%d", &n);//in >> n; ^ user.cpp:40:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int choice; fscanf(in, "%d", &choice); //in >> choice; ^ user.cpp:43:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int x; fscanf(in, "%d", &x);//in >> x; ^ user.cpp:79:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int x; fscanf(in, "%d", &x); //in >> x; ^