cpp 4.19

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4.19

#include<iostream>int main(){using namespace std;double wages[3] = {10000.0, 20000.0, 30000.0};short stacks[3] = {3, 2, 1};double*pw = wages;short*ps = &stacks[0];cout << "pw = " << pw << ", *pw = " << *pw << endl;pw = pw + 1;cout << "add 1 to the pw pointer:\n";cout << "pw = " << pw << ", *pw = " << *pw << "\n\n";cout << "ps = " << ps << ", *ps = " << *ps << endl;ps = ps + 1;cout << "add 1 to the ps pointer:\n";cout << "ps = " << ps << ", *ps = " << *ps << "\n\n";cout << "caaess two elements with array notation\n";cout << "stacks[0] = " << stacks[0]<< ", stacks[1] = " << stacks[1] << endl;cout << "access two elements with pointer notation\n";cout << "*stacks = " << *stacks<< ", *(stacks + 1) = " << *(stacks + 1) << endl;cout << sizeof(wages) << " = size of wages array\n";cout << sizeof(pw) << " = size of pw pointer\n";return 0;}

提示无法查找或打开 PDB 文件，

在菜单栏中依次找到如下选项，并按提示操作，
1、调试（D)
2、选项和设置（G)...
3、右边勾上 “启用源服务器支持”
4、左边点 “符号”
5、勾选“Microsoft符号服务器”
6、“确定”点完之后可能会有一些提示，不用管它，继续“确定”
7、调试运行，这时候会出现另一些提示框，说“ntdll.dll正在从**服务器下载****”之类的

4.20

#define _CRT_SECURE_NO_WARNINGS#include<iostream>#include<cstring>int main(){using namespace std;char animal[20] = "bear";const char*bird = "wren";char*ps;cout << animal << " and ";cout << bird << "\n";cout << "Enter a kind of animal: ";cin >> animal;ps = animal;cout << ps << "!\n";cout << "Before using strcpy():\n";cout << animal << " at " << (int *)animal << endl;cout << ps << " at " << (int *)ps << endl;ps = new char[strlen(animal) + 1];strcpy(ps, animal);cout << "After using strcpy():\n";cout << animal << " at " << (int *)animal << endl;cout << ps << " at " << (int *)ps << endl;delete[] ps;system("pause");return 0;}

4.21

#include<iostream>struct inflatable{char name[20];float volume;double price;};int main(){using namespace std;inflatable*ps = new inflatable;cout << "Enter name of inflatable item: ";cin.get(ps->name, 20);cout << "Enter volume in cubic feet: ";cin >> (*ps).volume;cout << "Enter price: $";cin >> ps->price;cout << "name: " << (*ps).name << endl;cout << "Volume: " << ps->volume << " cubic feet\n";cout << "Price: $" << ps->price << endl;delete ps;system("pause");return 0;}

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