例将数从大到小输出 swap(int *pl, int *p2) i int p (main) 2000 整型变量a p 1一* 2002 整型变量b p 2: 2004 指针 pointer 1 pz-p 2000 2006 指针 pointer2 地址传递 2002 maino 2008 i int a, b 200A int*pointer I, pointer 2 200C scanf("%od, %d", &a, &b) POOR pointer_ 1=&a; pointer_2=&b; 2010 if(a<b)swap(pointer 1, pointer 2); printf("n%d, %dn", a, b) 运行结果:9,5
swap(int *p1, int *p2) { int p; p=*p1; *p1=*p2; *p2=p; } main() { int a,b; int *pointer_1,*pointer_2; scanf("%d,%d",&a,&b); pointer_1=&a; pointer_2=&b; if(a<b)swap(pointer_1,pointer_2); printf("\n%d,%d\n",a,b); } …... 2000 2008 200A 2002 2004 2006 200C 200E 2010 ... 5 9 整型变量a 整型变量b (main) 指针pointer_1 指针pointer_2 2000 2002 5 9 例 将数从大到小输出 运行结果：9，5 地址传递
例将数从大到小输出 swap(int *pl, int*p2) i int*p (main) 整型变量a p=*p1 Int X; 2002 整型变量b p 1=*p2 PZ, int *p=&x 2004 指针poi p2=*p 2000 2006 指针 pointer 2 编译警告! 2008 2002 malr 结果不对!COPY ( swap i int a, b 十指针p1 2000 int*pointer I, pointer 2 200C 指针p2 2002 scanf("%od, %od", &a, &b) 200E 指针p pointer I=&a pointer 2=&b 2010 1假设2000 if(a<b) swap(pointer 1, pointer 2) printf("n%d, %dn",a, b) 指针变量在使用 必须赋值 运行结果:9,9
swap(int *p1, int *p2) { int *p; *p=*p1; *p1=*p2; *p2=*p; } main() { int a,b; int *pointer_1,*pointer_2; scanf("%d,%d",&a,&b); pointer_1=&a; pointer_2=&b; if(a<b) swap(pointer_1,pointer_2); printf("\n%d,%d\n",a,b); } 运行结果：9，9 编译警告！ 结果不对！ int x; int *p=&x;x; 例 将数从大到小输出 …... 2000 2008 200A 2002 2004 2006 200C 200E 2010 ... 5 9 整型变量a 整型变量b (main) 指针pointer_1 指针pointer_2 2000 2002 9 9 2000 2002 COPY (swap) 指针p1 指针p2 指针p **** 假设2000 指针变量在使用前 必须赋值！
例将数从大到小输出 * ch9 32 c*/ (main) swap(int x, int y) 2000 整型a i int t 2002 整型b t=x,x-y;y=t; 2004 值传递 pointer I 2000 2006 pointer malr 2008 2002 Int a, b, COPY 200 (swap) 整型x int*pointer I, pointer 2 scanf("%od, %d", &a, &b 200C 整型b pointer I=&a pointer 2 &b 200B 整型t if(a<b) swap( pointer 1, pointer 2) 2010 printf("n%d, %dn", a, b) 运行结果:5,9
/*ch9_32.c*/ swap(int x,int y) { int t; t=x; x=y; y=t; } main() { int a,b; int *pointer_1,*pointer_2; scanf("%d,%d",&a,&b); pointer_1=&a; pointer_2=&b; if(a<b) swap(*pointer_1,*pointer_2); printf(" \n%d,%d \n",a,b); } 运行结果： 5 ， 9 例 将数从大到小输出 值传递 …... 2000 2008 200A 2002 2004 2006 200C 200E 2010 ... 59 整型 a 整型 b (main) pointer_1 pointer_2 2000 2002 9 COPY (swap) 整型 x 整型 b 整型 t 5595
例将数从大到小输出 swap(int *pl, int *p2) i int"p (main) p=pl 00 整型a pl=p2 2002 5 整型b )2=p; 地址传递 20041 pointer 1 2000 20061 pointer 2 mal 2002 i int a, b COPYY2008 200 (swap) 指针pl int* pointer 1, *pointer 2 2002 2200C 指针p2 scanf("%d, %d", &a, &b; 2000 pointer 1=&a; pointer 2=&b 200E 指针p 2000 if(ab) swap(pointer 1, pointer 2) printf("%d, %d", pointer 1, *pointer 2) 运行结果:5,9
运行结果：5，9 例 将数从大到小输出 swap(int *p1, int *p2) { int *p; p=p1; p1=p2; p2=p; } main() { int a,b; int *pointer_1,*pointer_2; scanf("%d,%d",&a,&b); pointer_1=&a; pointer_2=&b; if(a<b) swap(pointer_1,pointer_2); printf("%d,%d",*pointer_1,*pointer_2); } …... 2000 2008 200A 2002 2004 2006 200C 200E 2010 ... 5 9 整型a 整型b (main) pointer_1 pointer_2 2000 2002 2000 2002 COPY (swap) 指针p1 指针p2 指针p 2000 **** 地址传递 2000 2002
与组 指与组
指针与数组 指针与数组 指针与数组