؟(z)
˱ĵľW(wng)߀W(xu)v| ߿ п Կ ɿZ| QӢZ ̄(w)ӢZ ӢZY| (w)T (bo)P(gun)T y Cȯ ˾ (do) ̎Ӌ(j)C(j)| ȿ ܛ
|һ r(ji) O(jin)펟 ԃ ȫ Y(ji)(gu) r(ji) r(ji)TӋ(j)| Ӌ(j)C Ӌ(j)Q ע (jng)(j) (w)t(y)W(xu)| l(wi)Y t(y) ˎ []
5 (null) ָ
}б
5.1 Ŀָᘵʲô?
5.2 ڳ@һ(g)ָ?
5.3 ÿsָᘱ^if(p) zָǷɿ?ָᘵă(ni)_(d)0 ô?
5.4 NULL ʲô, ôx?
5.5 ʹ÷ȫָᘃ(ni)_(d)ęC(j), NULL ζx?
5.6 NULL x#define NULL ((char *)0) yͿ(sh)벻D(zhun)QNULL ˆ?
5.7 NULL 0 ָᘳ(sh)ǵȃr(ji), ҵԓһ(g)?
5.8 NULL ֵ׃, ʹ÷(ni)ָᘵęC(j), yNULL ( 0) ǸÆ?
5.9 A(y)x#define Nullptr(type) (type *)0 (chung)_͵Ŀָ
5.10 @c(din)NULL Դ_0, (null) ָᘅsһ?
5.11 ʲôôP(gun)ڿָᘵɻ?ʲô@Щ}˽(jng)سF(xin)?
5.12 ҺҾDz@ЩָһĖ|
5.13 ]P(gun)ָᘵ@Щ, yҪ(ni)_(d)횞0 ǸΆ?
5.14 f, ЙC(j)÷ָᘆ, ߲ͬòͬı_(d)?
5.15 \(yn)Еr(sh)ġָxֵ e(cu)`ʲô˼?