Compilare: user.c: In function ‘main’: user.c:11:17: warning: variable ‘z’ set but not used [-Wunused-but-set-variable] int n,m,k,j,z,sum=0; ^ user.c:11:15: warning: unused variable ‘j’ [-Wunused-variable] int n,m,k,j,z,sum=0; ^ user.c:11:13: warning: unused variable ‘k’ [-Wunused-variable] int n,m,k,j,z,sum=0; ^ user.c:12:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%i %i",&n,&m); ^ user.c:28:19: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%i",&t[i][j]); ^ user.c:31:22: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fr(i,0,m){ fscanf(f,"%i %i %i",&ell[i][0],&ell[i][1],&ell[i][2]); } ^