Compilare: user.cpp: In function ‘void init()’: user.cpp:17: warning: unused variable ‘c’ user.cpp: In function ‘int main()’: user.cpp:54: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:58: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘int det(int, int)’: user.cpp:48: warning: control reaches end of non-void function