void fix set diag opt(fix matrix A, int valt int *Aptr= &A[OJO]+ 255 nt cnt=n-1 dot Aptr= val Aptr-=(N+1) cnt While(cnt >=0)void fix_set_diag_opt(fix_matrix A, int val){ int *Aptr = &A[0][0] + 255; int cnt = N-1; do{ *Aptr = val; Aptr -= (N+1); cnt--; }while(cnt >= 0); }