Compilare: user.cpp:4: warning: ISO C++ forbids declaration of ‘main’ with no type user.cpp: In function ‘int main()’: user.cpp:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:14: warning: ‘i’ is used uninitialized in this function user.cpp:14: warning: ‘a’ is used uninitialized in this function user.cpp:15: warning: ‘j’ may be used uninitialized in this function