Compilare: user.cpp: In function ‘int main()’: user.cpp:29:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&T); ^ user.cpp:32:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&N); ^ user.cpp:33:114: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i=0;i<N;i++) fscanf(f,"%lf%lf%lf%lf",&D[0][0][i][i],&D[0][1][i][i],&D[1][0][i][i],&D[1][1][i][i]); ^