Compilare: user.cpp: In function ‘int update(int, int)’: user.cpp:39: warning: no return statement in function returning non-void user.cpp: In function ‘int main()’: user.cpp:64: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:73: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:79: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result