Compilare: user.cpp: In function ‘int main()’: user.cpp:63:53: warning: format ‘%lf’ expects argument of type ‘double’, but argument 3 has type ‘long double’ [-Wformat=] for (int i=1;i<=m;i++) fprintf(g,"%.8lf ",ans[i]); ^ user.cpp:30:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&n,&m); ^ user.cpp:31:79: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (int i=1;i<=n;i++) for (int j=1;j<=m+1;j++) fscanf(f,"%lf",&mat[i][j]); ^