Compilare: user.cpp: In function ‘int main()’: user.cpp:9:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&m,&n); ^ user.cpp:11:51: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (j=1;j<=n;j++) fscanf(f,"%d",&a[i][j]); ^ user.cpp:12:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&k); ^ user.cpp:15:50: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d%d%d",&l1,&c1,&l2,&c2,&p); ^ user.cpp:59:5: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] for (i=1;i<=x;i++) fprintf(g," %d",v[i]); ^