Compilare: user.cpp: In function ‘int opInt(int, int, Operation)’: user.cpp:49:10: warning: unused variable ‘bit’ [-Wunused-variable] bool bit; ^ user.cpp: In function ‘bool opBits(bool, bool, Operation)’: user.cpp:45:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:88:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &testCase); ^ user.cpp:90:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &N); ^ user.cpp:94:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &V[i][j]); ^