整型指针及数组

1、整型指针与数组辽宁科技大学 黄建2指针定义及引用int a, int a, * *p;p;a = 3;a = 3;3 320002000a ap p20002000printf(a = %d, printf(a = %d, * *p = %d, a, p = %d, a, * *p);p);a = 3, a = 3, * *p = 3p = 3取地址取地址取值取值指针变量指针变量p = p = & &a;a;3指针与变量2-1int a, int a, * *p;p;a = 3;a = 3;p = &a;p = &a;3 320002000a ap p20002

2、000printf(a = %d, printf(a = %d, * *p = %d, a, p = %d, a, * *p);p);a = 4, a = 4, * *p = p = 4 44 4a = 4;a = 4;4指针与变量2-2int a, int a, * *p;p;a = 3;a = 3;p = &a;p = &a;3 320002000a ap p20002000printf(a = %d, printf(a = %d, * *p = %d, a, p = %d, a, * *p);p);a = a = 4 4, , * *p = 4p = 44 4* *p =

3、 4;p = 4;5两个指针变量2-1int a=3, b=4;int a=3, b=4;int int * *p, p, * *w;w;p = &a;p = &a;w = &b;w = &b;3 320002000a ap p20002000printf(%d,%d,%d,%d, a,b,printf(%d,%d,%d,%d, a,b,* *p,p,* *w);w);4,4,4,44,4,4,44 4* *p = p = * *w;w;4 430003000b bw w300030006两个指针变量2-2int a=3, b=4;int a=3, b=4;in

4、t int * *p, p, * *w;w;p = &a;p = &a;w = &b;w = &b;3 320002000a ap p20002000printf(%d,%d,%d,%d, a,b,printf(%d,%d,%d,%d, a,b,* *p,p,* *w);w);3,4,3,4,4 4,4,4p = w;p = w;4 430003000b bw w30003000300030007习题演练int a=1, b=3, c=5;int a=1, b=3, c=5;int int * *p, p, * *w, w, * *s;s;p=&a, w

5、=&b, s=&c;p=&a, w=&b, s=&c;1 1a ap p5,9,2,9,5,95,9,2,9,5,93 3b bw w5 5c cs s( (* *p)+;p)+;2 2* *w=w=* *p,p,* *p=p=* *s,s,* *s=s=* *w;w;2 25 52 2s=w,s=w, w=p,w=p, p=s;p=s;* *p = p = * *w + w + * *s + b;s + b;9 98数组与地址1 1200020003 35 520042004 20082008a0a0 a1a1 a2a2= =20002000a a数组

6、代表类型相同、连续存放数组代表类型相同、连续存放连续连续数组名代表地址数组名代表地址地址地址数组名代表常量数组名代表常量常量常量9数组恒等式for (i = 0; i 3; i+)for (i = 0; i 3; i+)1 1200020003 35 52 20 01 1a a20042004 20082008 printf(%d, printf(%d, aiai););* *(a+i)(a+i)= =20002000数组恒等式：数组恒等式：aiai * *(a+i)(a+i)10指针与数组for (i = 0; i 3; i+)for (i = 0; i 3; i+)1 1200020003

7、 35 52 20 01 1a a20042004 20082008printf(%d,printf(%d,= =20002000p pp = a;p = a;, ai);, ai);, , pipi););* *(p+i)(p+i)11指针就是数组指针就是数组数组名是指针数组名是指针指针是地址指针是地址12指针是数组1 1200020003 35 52 20 01 1a a20042004 20082008printf(%d, printf(%d, p0p0););= =20002000p pp = a + 1;p = a + 1;printf(%d, printf(%d, * *(p+0)

8、(p+0););printf(%d,%d, printf(%d,%d, p1p1, , p-1p-1););13指针自增1 1200020003 35 52 20 01 1a a20042004 20082008for (i = 0; i 3; i+)for (i = 0; i 3; i+)= =20002000p pp = a;p = a; printf(%d, printf(%d, * *p p); ); p+p+; ; printf(%d, printf(%d, * *p+p+););p pp pp p20122012pipi* *(p+i)(p+i)aiai* *(a+i)(a+i)*

9、 *a+a+数组名代表常量数组名代表常量常量常量14指针与自增8-11 13 30 01 1a ap pp = a;p = a;k = k = * *p+;p+;p pk=1, k=1, * *p=3, a0=1, a1=3p=3, a0=1, a1=3 k = k = * *(p+);(p+); 右结合右结合1 1k k k=k=* *p, p+;p, p+;15指针与自增8-21 13 30 01 1a ap pp = a;p = a;k = k = * *+p;+p;p pk=3, k=3, * *p=3, a0=1, a1=3p=3, a0=1, a1=3 k = k = * *(+p

10、);(+p); 右结合右结合3 3k k +p, k=+p, k=* *p;p;16指针与自增8-31 13 30 01 1a ap pp = a;p = a;k = (k = (* *p)+;p)+;k=1, k=1, * *p=2, a0=p=2, a0=2 2, a1=3, a1=31 1k k k=k=* *p, (p, (* *p)+;p)+;2 217指针与自增8-41 13 30 01 1a ap pp = a;p = a;k = +(k = +(* *p);p);k=2, k=2, * *p=2, a0=2, a1=3p=2, a0=2, a1=32 2k k +(+(* *p

11、),p), k=k=* *p;p;2 218指针与自增8-51 13 30 01 1a ap pp = a;p = a;k = +(k = +(* *p+);p+);k=2, k=2, * *p=3, a0=2, a1=3p=3, a0=2, a1=32 2k k +(+(* *p),p), k=k=* *p, p+;p, p+;2 2p p19指针与自增8-61 13 30 01 1a ap pp = a;p = a;k = (k = (* *+p)+;+p)+;k=3, k=3, * *p=p=4 4, a0=1, a1=, a0=1, a1=4 43 3k k +p,+p, k=k=*

12、*p, (p, (* *p)+;p)+;4 4p p20指针与自增8-71 13 30 01 1a ap pp = a;p = a;k = (k = (* *p+)+;p+)+;k=1, k=1, * *p=3, a0=p=3, a0=2 2, a1=3, a1=31 1k k k=k=* *p, (p, (* *p)+, p+;p)+, p+;2 2p p右结合右结合21指针与自增8-81 13 30 01 1a ap pp = a;p = a;k = +(k = +(* *+p);+p);k=4, k=4, * *p=4, a0=1, a1=4p=4, a0=1, a1=44 4k k +

13、p, +(+p, +(* *p), k=p), k=* *p;p;4 4p p右结合右结合22地址自增比较1 13 30 01 1a ap pp = a;p = a;k = k = * *p+p+; ;p pk=1, k=1, * *p=3p=3 k =k = * *(p+)(p+); ;1 1k kp = a;p = a;k=1, k=1, * *p=2p=2k = (k = (* *p)+p)+; ;2 2 1 13 30 01 1a ap p1 1k k23地址与自增小结k = k = * *p+;p+; k=k=* *p, p+;p, p+;k = k = * *+p;+p; +p,

14、k=+p, k=* *p;p;k = (k = (* *p)+;p)+; k=k=* *p, (p, (* *p)+;p)+;k = +(k = +(* *p);p); +(+(* *p),p), k=k=* *p;p;k = (k = (* *+p)+;+p)+; +p,+p, k=k=* *p, (p, (* *p)+;p)+;k = +(k = +(* *p+);p+); +(+(* *p),p), k=k=* *p, p+;p, p+;k = (k = (* *p+)+;p+)+; k=k=* *p, (p, (* *p)+, p+;p)+, p+;k = +(k = +(* *+p);+p); +p, +(+p, +(* *p), k=p), k=* *p;p;24为指针变量赋初值int a = 3, int a = 3, * *p;p;p = &a;p = &a;int a = 3, int a = 3, * *p p; ;p p = &