C编程例题个人总结2014-07-06.doc

VS2008通过编译1、交换两个数值#includeusing namespace std;void swap(int x,int y);int main()int a=2,b=3;swap(a,b);printf(a=%d,b=%d,a,b); return 0;void swap(int x,int y)int temp;temp=x;x=y;y=temp;显示结果 a=2,b=3无法交换两个数值#includeusing namespace std;void swap(int &x,int &y);int main()int a=2,b=3;swap(a,b);printf(a=%d,b=%d,a,b); return 0;void swap(int &x,int &y)int temp;temp=x;x=y;y=temp;显示结果 a=3,b=2 通过了引用，实现了两个数值交换函数的定义为int类型，返回值有两个#includeusing namespace std;int swap(int &x,int &y);int main()int a=2,b=3;swap(a,b);printf(a=%d,b=%d,a,b); return 0;int swap(int &x,int &y)int temp;temp=x;x=y;y=temp;return x,y;显示结果 a=3,b=22、指针#includeusing namespace std;int main()int a=5;int *p1=&a;int *p2=&p1;printf(a的存储地址为：%dn,p1);printf(a的值%dn,*p1);printf(%dn,p2);printf(%dn,*p2);printf(%dn,*p2);return 0;显示结果：a的存储地址为：1245024a的值5124501212450245请按任意键继续. . .#includeusing namespace std;int main()int a=5;int *p1=NULL;p1=&a;int *p2=&p1;int *p3=&p2;printf(a的存储地址为：%dn,p1);printf(a的值%dn,*p1);printf(n);printf(%dn,p2);printf(%dn,*p2);printf(%dn,*p2);printf(n);printf(%dn,p3);printf(%dn,*p3);printf(%dn,*p3);return 0;a的存储地址为：1245024a的值5124501212450245124500012450121245024请按任意键继续. . .#includeusing namespace std;int main()int a=5;int *p1=&a;int *p2=p1;printf(a的存储地址为：%dn,p1);printf(a的值%dn,*p1);printf(%dn,p2);printf(%dn,*p2);printf(%dn,*p2);return 0;1- 已启动生成: 项目: 55, 配置: Debug Win32 -1正在编译.155.cpp1c:documents and settingsadministratormy documentsvisual studio 2008projects555555.cpp(7) : error C2440: “初始化”: 无法从“int *”转换为“int *”1 与指向的类型无关；转换要求reinterpret_cast、C 样式转换或函数样式转换1生成日志保存在“file:/c:Documents and SettingsAdministratorMy DocumentsVisual Studio 2008Projects5555DebugBuildLog.htm”155 - 1 个错误，个警告= 生成: 成功0 个，失败1 个，最新0 个，跳过0 个=#includeusing namespace std;int main()int a=5;int *p1=&a;int *p2=&p1;int *p3=&p2;printf(a的存储地址为：%dn,p1);printf(a的值%dn,*p1);printf(n);printf(%dn,p2);printf(%dn,*p2);printf(%dn,*p2);printf(n);printf(%dn,p3);printf(%dn,*p3);printf(%dn,*p3);return 0;显示结果：a的存储地址为：1245024a的值5124501212450245124500012450121245024请按任意键继续. . .#includeusing namespace std;int main()int a=5;int *p1=&a;int *p2=&p1;int *p3=&a;printf(a的存储地址为：%dn,p1);printf(a的值%dn,*p1);printf(n);printf(%dn,p2);printf(%dn,*p2);printf(%dn,*p2);printf(n);printf(%dn,p3);printf(%dn,*p3);printf(%dn,*p3);return 0;1- 已启动生成: 项目: 55, 配置: Debug Win32 -1正在编译.155.cpp1c:documents and settingsadministratormy documentsvisual studio 2008projects555555.cpp(8) : error C2440: “初始化”: 无法从“int *”转换为“int *”1 与指向的类型无关；转换要求reinterpret_cast、C 样式转换或函数样式转换1生成日志保存在“file:/c:Documents and SettingsAdministratorMy DocumentsVisual Studio 2008Projects5555DebugBuildLog.htm”155 - 1 个错误，个警告= 生成: 成功0 个，失败1 个，最新0 个，跳过0 个=#includeusing namespace std;int main()int a=5;int *p1=&a;int *p2=&p1;int *p3=&p1;printf(a的存储地址为：%dn,p1);printf(a的值%dn,*p1);printf(n);printf(%dn,p2);printf(%dn,*p2);printf(%dn,*p2);printf(n);printf(%dn,p3);printf(%dn,*p3);printf(%dn,*p3);return 0;1- 已启动生成: 项目: 55, 配置: Debug Win32 -1正在编译.155.cpp1c:documents and settingsadministratormy documentsvisual studio 2008projects555555.cpp(8) : error C2440: “初始化”: 无法从“int *”转换为“int *”1 与指向的类型无关；转换要求reinterpret_cast、C 样式转换或函数样式转换1生成日志保存在“file:/c:Documents and SettingsAdministratorMy DocumentsVisual Studio 2008Projects5555DebugBuildLog.htm”155 - 1 个错误，个警告= 生成: 成功0 个，失败1 个，最新0 个，跳过0 个=#includeusing namespace std;int main()int a=5;int *p1=NULL;p1=&a;int *p2=&p1;int *p3=&p2;printf(a的存储地址为：%dn,p1);printf(a的值%dn,*p1);printf(n);printf(%dn,p2);printf(%dn,*p2);printf(%dn,*p2);printf(n);printf(%dn,p3);printf(%dn,*p3);printf(%dn,*p3); printf(%dn,*p3);return 0;a的存储地址为：1245024a的值51245012124502451245000124501212450245请按任意键继续. . .#includeusing namespace std;int main()int a=5;int *p1=NULL;p1=&a;int *p2=NULL;p2=&p1;int *p3=&p2;printf(a的存储地址为：%dn,p1);printf(a的值%dn,*p1);printf(n);printf(%dn,p2);printf(%dn,*p2);printf(%dn,*p2);printf(n);printf(%dn,p3);printf(%dn,*p3);printf(%dn,*p3); printf(%dn,*p3);return 0;a的存储地址为：1245024a的值51245012124502451245000124501212450245请按任意键继续. . .3、常量指针常量指针只能从内存中读取数据，不能修改内存中的数据，也就是说常量指针不能通过间接引用来修改指向地址内的数据，但指针的指向可以改变。#includeusing namespace std;int main()int a=5,b=9;const int *p1=&a;printf(%dn,p1);p1=&b;printf(%dn,p1);return 0;12450241245012请按任意键继续. . .#includeusing namespace std;int main()int a=5,b=9;const int *p1=&a;printf(%dn,p1);*p1=6;p1=&b;printf(%dn,p1);return 0;1- 已启动生成: 项目: 55, 配置: Debug Win32 -1正在编译.155.cpp1c:documents and settingsadministratormy documentsvisual studio 2008projects555555.cpp(8) : error C3892: “p1”: 不能给常量赋值1生成日志保存在“file:/c:Documents and SettingsAdministratorMy DocumentsVisual Studio 2008Projects5555DebugBuildLog.htm”155 - 1 个错误，个警告= 生成: 成功0 个，失败1 个，最新0 个，跳过0 个=#includeusing namespace std;int main()int a=5,b=9;int *p1=&a;printf(%dn,p1);printf(%dn,a);*p1=6; printf(%dn,a);p1=&b;printf(%dn,p1);return 0;1245024561245012请按任意键继续. . .4、指针常量#includeusing namespace std;int main()int a=5,b=9;int *const p1=&a;printf(%dn,p1);printf(%dn,a);*p1=6; printf(%dn,a);return 0;124502456请按任意键继续. . .5、指针函数#includeusing namespace std;int *max(int *array,int size);int main()int array=5,3,6,1,2,7,9,10;printf(数组最大值=%dn,*max(array,sizeof(array)/sizeof(int);return 0;int *max(int *array,int size)int *max=array;for(int i=0;i*max)max=&arrayi;return max;1245024561245012请按任意键继续. . .#includeusing namespace std;int *max(int *array,int size);int main()int array=5,3,46,19,2,52,9,10;printf(%dn,max(array,sizeof(array)/sizeof(int);return 0;int *max(int *array,int size)int *m=array;for(int i=0;i*m)m=&arrayi;return m;1245016请按任意键继续. . .#includeusing namespace std;int *max(int *a,int size);int main()int array=5,3,46,19,2,52,9,10;printf(%dn,max(array,sizeof(array)/sizeof(int);return 0;int *max(int *a,int size)int *m=a;for(int i=0;i*m)m=&ai;return m;1245016请按任意键继续. . .6、枚举类型#includeusing namespace std;int main()enum daysunday,monday,tuesday,wednesday,thursday,friday,saturday;day today=sunday;printf(%d,today);return 0;0请按任意键继续. . .6、结构体#includestruct studentint idnumber;char name15;int age;char department20;float gpa;void display(student *arg);int main()s