## 实验7 指针的使用 ### 实验任务 7-1.c 运行结果截图：![图片描述](https://dn-simplecloud.shiyanlou.com/courses/uid1527941-20210603-1622701378677) 7-2.c 运行结果截图：![图片描述](https://dn-simplecloud.shiyanlou.com/courses/uid1527941-20210603-1622702510370) 7-3.c 运行结果截图：![图片描述](https://dn-simplecloud.shiyanlou.com/courses/uid1527941-20210603-1622702691812) 7-4.c 运行结果截图：![图片描述](https://dn-simplecloud.shiyanlou.com/courses/uid1527941-20210610-1623305833037) 7-5.c 运行结果截图：![图片描述](https://dn-simplecloud.shiyanlou.com/courses/uid1527941-20210610-1623306619775) 7-6.c 运行结果截图：![图片描述](https://dn-simplecloud.shiyanlou.com/courses/uid1527941-20210610-1623306941623) 7-7.c 运行结果截图：![图片描述](https://dn-simplecloud.shiyanlou.com/courses/uid1527941-20210610-1623307314261) 7-8.c 运行结果截图：![图片描述](https://dn-simplecloud.shiyanlou.com/courses/uid1527941-20210617-1623907645937) 7-9.c 运行结果截图：![图片描述](https://dn-simplecloud.shiyanlou.com/courses/uid1527941-20210617-1623908290913) ### 上机练习 ##### 1、输入三个整数，按由小到大的顺序输出。 - 代码 ```c #include int main() { void sort(int *p_a, int *p_b); int a, b, c, *p_a=&a, *p_b=&b, *p_c=&c; printf("请随意输入三个整数："); scanf("%d%d%d", p_a, p_b, p_c); sort(p_a, p_b); sort(p_a, p_c); sort(p_b, p_c); printf("按照由小到大的顺序输出如下：\n%3d\t %3d\t %3d\n", *p_a, *p_b, *p_c); return 0; } void sort(int *p_a, int *p_b) { int temp; if(*p_a>*p_b){ temp = *p_a; *p_a = *p_b; *p_b = temp; } } ``` - 运行结果截图：![图片描述](https://dn-simplecloud.shiyanlou.com/courses/uid1527941-20210630-1625062670199) ##### 2、**任意输入10个数，求其平均数**。 - 代码 ```c #include int main() { int input(int * p1); float getAvg(int * p2); int a[10]; int *p; float avg=0; p=a; input(p); avg=getAvg(p); printf("%.2f",avg); } int input(int * p1) { int i=0; printf("please input 10 number:"); for(i=0;i<10;i++,p1++) scanf("%d",p1); } float getAvg(int * p2) { int i; float sum=0,avg=0; for(i=0;i<10;i++) sum=sum+*(p2++); return avg=sum/10; } ``` - 运行结果截图：![图片描述](https://dn-simplecloud.shiyanlou.com/courses/uid1527941-20210630-1625063204086) ##### 3、**练习使用排序方法和对本章内容进行复习**。 - 代码 ```c #include int main() { int i; int a[10]; printf("请输入数据\n"); for( i=0; i<10; i++ ) scanf("%d", &a[i]); selectSort(a, 10); printf("选择法从大到小排序结果为:\n"); for( i = 0; i < 10; i++ ) printf(" %d", a[i]); printf("\n"); bubbleSort(a, 10); printf("冒泡法从小到大排序结果为:\n"); for( i = 0; i < 10; i++ ) printf(" %d", a[i]); printf("\n"); return 0; } void selectSort( int a[], int n ) { int b[100]; for(int k=0;kb[i]) { max = j; if(max!=i) { temp = b[i]; b[i] = b[j]; b[j] = temp; } } } } for(int k=0;k a[j + 1]) { temp = a[j]; a[j] = a[j + 1]; a[j + 1] = temp; } } } } ``` - 运行结果截图：![图片描述](https://dn-simplecloud.shiyanlou.com/courses/uid1527941-20210630-1625067263544)

“程序设计基础II”实验报告