Compilare: user.cpp: In function ‘int main()’: user.cpp:75:89: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d%d%d%d%d", &n, &m, &print.lin, &print.col, &castel.lin, &castel.col); ^ user.cpp:80:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &a[i][j]); ^