[教育学]中国矿业大学上机实践.doc

实验九、指针一、 实验目的1. 通过实验进一步掌握指针的概念，会定义和使用指针变量；2. 能正确使用数组的指针和指向数组的指针变量；3. 能正确使用字符串的指针和指向字符串的指针变量；4. 了解指向指针的指针的概念及其使用方法。二、 实验内容：1 输入3个整数，按由小到大的顺序输出，然后将程序改为：输入3个字符串，按由小到大顺序输出。2 将一个3*3的矩阵转置，用以函数实现之。在主函数中用scanf函数输入以下矩阵元素：1 3 77 9 1113 15 19将数组名作为函数实参，在执行函数的过程中实现矩阵转置，函数调用结束后在主函数中输出已转置的矩阵。三、 源程序：9_1_1#include stdio.hvoid main()void swap(int * p1,int * p2);int n1,n2,n3;int * p1,* p2,* p3;printf(input three integer n1,n2,n3:);scanf(%d,%d,%d,&n1,&n2,&n3);p1=&n1;p2=&n2;p3=&n3;if (n1n2) swap (p1,p2);if (n1n3) swap (p1,p3);if (n2n3) swap (p2,p3);printf(Now,the order is : %d,%d,%dn,n1,n2,n3);void swap(int * p1,int * p2)int p;p=* p1;* p1=* p2;* p2=p;9_1_2#include stdio.h#include string.hvoid main()void swap(char * ,char *);char str150,str250,str350;printf(input three line :n);gets(str1);gets(str2);gets(str3);if (strcmp(str1,str2)0) swap(str1,str2);if (strcmp(str1,str3)0) swap(str1,str3);if (strcmp(str2,str3)0) swap(str2,str3);printf(Now,the order is :n);printf(%sn%sn%sn,str1,str2,str3);void swap(char * p1,char * p2)char p50;strcpy(p,p1);strcpy(p1,p2);strcpy(p2,p);9_2#include stdio.hvoid main()void move(int * pointer);int a33,* p,i;printf(input matrix:n);for(i=0;i3;i+)scanf(%d %d %d,&ai0,&ai1,&ai2);p=&a00;move(p);printf(Now,matrix:n);for (i=0;i3;i+)printf(%d %d %dn,ai0,ai1,ai2);void move(int * pointer)int i,j,t;for(i=0;i3;i+)for(j=i;j3;j+)t= * (pointer+3 * i+j);* (pointer+3 * i+j)= * (pointer+3 * j+i);* (pointer+3 * j+i)=t;四、 实验结果：9_1_1input three integer n1,n2,n3:1351,1505,1534Now,the order is : 1351,1505,1534Press any key to continue9_1_2input three line :I study very hard.C language is very interesting.He is a professfor.Now,the order is :C language is very interesting.He is a professfor.I study very hard.Press any key to continue9_2input matrix:1 2 34 5 67 8 9Now,matrix:1 4 72 5 83 6 9Press any key to cont