整型指针与数组PPT学习教案

1、会计学1整型指针与数组整型指针与数组int a, *p;a = 3;p = &a;32000ap2000printf(%d, %d, a, *p);4, 44a = 4;第1页/共45页int a, *p;a = 3;p = &a;32000ap2000printf(%d, %d, a, *p);4, 44*p = 4;第2页/共45页int a = 3, b = 4;int *p, *w;p = &a;w = &b;32000ap2000printf(%d,%d,%d,%d, a, b, *p, *w);4,4,4,44*p = *w;43000bw3000第3页/共45页int a = 3

2、, b = 4;int *p, *w;p = &a;w = &b;32000ap2000printf(%d,%d,%d,%d, a, b, *p, *w);3,4,4,4p = w;43000bw30003000第4页/共45页int a = 1, b = 3, c = 5;int *p, *w, *s;p = &a, w = &b, s = &c;1ap5,9,2,9,5,93bw5cs(*p)+;2*w = *p,*p = *s,*s = *w;252s = w,w = p,p = s;*p = *w + *s + b;9第5页/共45页int a = 3, *p ;p = &a;p =

3、3;a = p;*p = &a;32000ap2000第6页/共45页87782006.9.30以下程序的运行结果是 int a = 1, b = 3, c = 5; int *p1 = &a, *p2 = &b, *p = &c; *p = *p1 * (*p2); printf(%d, c);3第7页/共45页= *w;2007.4.29设已有定义：float x;则以下对指针变量p进行定义且赋初值的语句中正确的是 A)float *p = 1024; B)int *p = (float)x; C)float *p = &x; D)float p = &x;第8页/共45页2006.4.2

4、4设有定义：double *p, a; 则以下scanf语句中能正确为变量a读入数据的是 A)*p = &a; scanf(%1f, p); B)*p = &a; scanf(%f, p); C)p = &a; scanf(%1f, *p); D)p = &a; scanf(%1f, p);第9页/共45页第10页/共45页n_;n if (*pmax *py) *pmax = *py;n if (*pmax *pz) *pmax = *pz;n printf(max = %d, max);*pmax = *px第11页/共45页12000352004 2008a0 a1 a2= 2000a数

5、组代表类型相同、连续存放连续数组名代表地址地址数组名代表常量常量第12页/共45页for (i = 0; i 3; i+) 1200035201a20042008 printf(%d, ai);*(a+i)=2000数组恒等式：ai *(a+i)第13页/共45页for (i = 0; i 3; i+)1200035201a20042008printf(%d,=2000pint *p = a;, ai);, pi);*(p+i)第14页/共45页指针就是数组数组名是指针指针是地址第15页/共45页1200035201a20042008printf(%d, p0);=2000pp = a + 1

6、;printf(%d, *(p+0);printf(%d,%d, p1, p-1);第16页/共45页2010.3.28设有定义：double a5, *p = a;以下能够代表数组元素a3的是 A)*(p+3) B)(*p)3 C)*p3 D)*p+32006.4.36以下程序运行后s的值是 int i, s = 0, t = 1,2,3,4,5,6,7,8,9; for (i = 0; i 9; i += 2) s += *(t + i);25第17页/共45页02004.4.30以下程序执行后，b的值是 int a10 = 1,2,3,4,5,6,7,8,9,10; int *p = &

7、a3, b = p5;2006.9.26以下程序的运行结果是 int a5 = 1,3,5,7,9; a += 2; printf(%d, a0); A)1 B)3 C)5 D)程序出错9第18页/共45页142005.9.31以下程序的运行结果是 int a10 = 1,2,3,4,5,6,7,8,9,10; int *p = &a3, *q = p + 2; printf(%dn, *p + *q); A)16 B)10 C)8 D)6第19页/共45页2004.9.33以下程序的运行结果是 int a = 1,2,3,4,5,6,7,8,9,10,11,12; int *p = a +

8、5, *q = NULL; *q = *(p + 5); printf(%d,%dn, *p, *q); A)6,11 B)5,10 C)6,6 D)运行有错第20页/共45页1200035201a20042008for (i = 0; i 3; i+)=2000pp = a; printf(%d, *p); p+;printf(%d, *p+);ppp2012pi*(p+i)ai*(a+i)*a+数组名代表常量常量第21页/共45页1301app = a;k = *p+;pk=1, *p=3, a0=1, a1=3 k = *(p+); 右结合1k k=*p, p+;第22页/共45页130

9、1app = a;k = *+p;pk=3, *p=3, a0=1, a1=3 k = *(+p); 右结合3k +p, k=*p;第23页/共45页1301app = a;k = (*p)+;k=1, *p=2, a0=2, a1=31k k=*p, (*p)+;2第24页/共45页1301app = a;k = +(*p);k=2, *p=2, a0=2, a1=32k +(*p), k=*p;2第25页/共45页1301app = a;k = +(*p+);k=2, *p=3, a0=2, a1=32k +(*p), k=*p, p+;2p第26页/共45页1301app = a;k =

10、 (*+p)+;k=3, *p=4, a0=1, a1=43k +p, k=*p, (*p)+;4p第27页/共45页1301app = a;k = (*p+)+;k=1, *p=3, a0=2, a1=31k k=*p, (*p)+, p+;2p右结合第28页/共45页1301app = a;k = +(*+p);k=4, *p=4, a0=1, a1=44k +p, +(*p), k=*p;4p右结合第29页/共45页1301app = a;k = *p+;pk=1, *p=3 k = *(p+);1kp = a;k=1, *p=2k = (*p)+;2 1301ap1k第30页/共45页

11、k = *p+; k=*p, p+;k = *+p; +p, k=*p;k = (*p)+; k=*p, (*p)+;k = +(*p); +(*p), k=*p;k = (*+p)+; +p, k=*p, (*p)+;k = +(*p+); +(*p), k=*p, p+;k = (*p+)+; k=*p, (*p)+, p+;k = +(*+p); +p, +(*p), k=*p;第31页/共45页123452008.4.11以下程序的运行结果是 int a5 = 2,4,6,8,10, *p = a; p+; printf(%d, *p);4例以下程序的运行结果是 int a5 = 1,

12、3,0,7,9, *p = a; while (*p) printf(%d, *p+);13第32页/共45页n D)for (i = 0; i *s) s = p;n printf(max = %d,);*s第35页/共45页2005.4.29以下程序的运行结果是 int a33, *p = &a00, i; for (i = 0; i 9; i+) pi = i; for (i = 0; i 3; i+) printf(%d, a1i);3456第36页/共45页逻辑恒等式：e != 0 eif (e != 0)while (e != 0)for ( ; e != 0; )e != 0 ?

13、 : 1 != 0 10 != 0 03 != 0 3第37页/共45页2007.9.21与(E)?(i+):(j-)中E等价的是 A)E=0 B)E!=0 C)E=1 D)E!=12008.9.17与(w)?(-x):(+y)中w等价的是 A)w=1 B)w=0 C)w!=1 D)w!=0第38页/共45页a0a1a2a&a0, a, a+0&a2, a+2地址a0, *a, *(a+0)a2, *(a+2)数值200020042008第39页/共45页二维数组两次取值是数值，其余情况是地址。二维数组在一次取值之前加行，一次取值之后加列。*与数组名紧密相连，表示第0行。*等价于 ，都表示取值。第40页/共45页&a23, *(a+2)+3, a2+3 地址&a20, a+2, *(a+2), *(a+2)+0, a2, a2+0地址&a03, *a+3, *(a+0)+3, a0+3 地址&a00, a, a+0, *a, *(a+0),*a+0, *(a+0)+0, a0, a0+0地址第41页/共45页a23, *(*(a+2)+3), *(a2+3) 数值a20, *(a+2), *(*(a+2)+0), *a2, *(a2+0)数值a03, *(*a+3), *(*(a+0)+3), *