Compilare: user.cpp: In function ‘int main()’: user.cpp:24: warning: unknown conversion type character ‘L’ in format user.cpp:24: warning: too many arguments for format user.cpp:14: warning: unused variable ‘sum’ user.cpp:17: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:15: warning: ‘n’ may be used uninitialized in this function