CPP_Basic_Code_P5.1-PP5.9.10
// The Notes Created by Z-Tech on 2017/2/17.
// All Codes Boot on 《C++ Primer Plus》V6.0
// OS：MacOS 10.12.4
// Translater：clang/llvm8.0.0 &g++4.2.1
// Editer：iTerm 2&Sublime text 3
// IDE: Xcode8.2.1&Clion2017.1
//P5.1
#include
int main()
{
using namespace std;
int i;
for (i=0;i<5;i++)
//注意循环初始化、循环测试和循环更新括号内全部是分号！不是逗号！
cout<<"C++ know loops.\n";
cout<<"C++ Know when to stop.\n";
return 0;
}
//P5.2
#include
int main()
{
using namespace std;
cout<<"Enter the starting countdown value: ";
int limit;
cin>>limit;
int i;
for (i=limit;i;i--)
//自减计算，到0为止，直接输入0则会立即退出，不执行循环
cout<<"i = "<
int main()
{
using namespace std;
int x;
cout<<"The expression x=100 has the value ";
cout<<(x=100)<3 has the value ";
cout<<(x>3)<3 has the value ";
cout<<(x>3)<
const int ArSize=16;//使用常量便之后修改
int main()
{
long long factorials[ArSize];//创建long long类型的数组
factorials[1]=factorials[0]=1LL;
//初始化数组的第1和第2个元素为long long型的1
//原因是0！和1！都等于1，而每个元素存储对应的i!
for (int i=2;i>by;
cout<<"Counting by "<>
cout<<"i= "<
#include
int main()
{
using namespace std;
cout<<"Enter a word: ";
string word;
cin>>word;
for (int i=word.size()-1;i>=0;i--)
//此处i的初始化并未考虑空值字符
cout<
int main()
{
using std::cout;
int a=20,b=20;
cout<<"a= "<
int main()
{
using namespace std;
cout<<"The Amazing accounts will sum and average ";
cout<<"Five numbers for you.\n";
cout<<"Please enter five values:\n";
double number;
double sum=0.0;
//此处定义了求和sum和存放输入的number
for (int i=1;i<=5;i++)//精确控制了五次循环
{
cout<<"Value "<>number;
sum+=number;
}//{}内为代码块，被C++视为一条语句
cout<<"Five exquisite choices indeed! ";
cout<<"They sum to "<
#include
int main()
{
using namespace std;
cout<<"Enter a word: ";
string word;
cin>>word;
char temp;
int i,j;
for (j=0,i=word.size()-1;j
int main()
{
using namespace std;
int quizscores[10]={20,20,20,20,20,19,20,18,20,20};
cout<<"Doing it right:\n";
int i;
for (i=1;quizscores[i]==20;i++)
//使用==比较是否相等，相等为true继续，不等为false跳出
cout<<"quiz "<
#include
int main()
{
using namespace std;
char word[5]="?ate";//定义了数组，将未知首字符设置为？
for (char ch='a';strcmp(word,"mate");ch++)
//使用strcmp()函数比较，字符串一样时跳出循环
//需要注意的是循环检测这部分的句子实际是strcmp()!=0的简写，含义一样
//两个字符串一致为false，否则为true，true则继续执行
{
cout<
#include
int main()
{
using namespace std;
string word="?ate";
for (char ch='a';word!="mate";ch++)
//不等于则为true，继续执行，使用C++ string类
{
cout<
const int ArSize=20;//可使用#include
int main()
{
using namespace std;
char name[ArSize];
cout<<"Your first name,please: ";
cin>>name;
cout<<"Here is your name,verticalized and ASCIIized:\n";
int i=0;
while (name[i]!='\0')
//可直接用name[i]即可，非0为true，遇空字符为0，false
//while循环无需初始化和循环更新参数
// !=空字符就继续，也就是到末尾前一直循环
//字符串自带结尾空字符标记，所以无需知道字符串长度
{
cout<
#include
int main()
{
using namespace std;
cout<<"Enter the delay time,in seconds: ";
float secs;
cin>>secs;
clock_t delay=secs*CLOCKS_PER_SEC;
//该常量描述每秒系统时间单位数，乘以秒数就是所需延迟的系统时间
cout<<"Starting\a\n";//\a是转义的振铃符
clock_t start=clock();//设置时间计时起始点
while (clock()-start
int main()
{
using namespace std;
int n;
cout<<"Enter number in the range 1-10 to find ";
cout<<"My favorite number\n";
do//这种循环是出口条件循环，至少执行一次循环体
{
cin>>n;
}while(n!=7);//表达式成立则继续，否则退出
cout<<"Yes,7 is My favorite number!\n";
return 0;
}
//P5.16
#include
int main()
{
using namespace std;
char ch;
int count=0;//将字符数初始化为0
cout<<"Enter characters;Enter # to quit:\n";
cin>>ch;//读入第一个字符
while (ch!='#')
{
cout<>ch;
}
cout<
int main()
{
using namespace std;
char ch;
int count=0;//将字符数初始化为0
cout<<"Enter characters;Enter # to quit:\n";
cin.get(ch);//使用cin.get()将不会忽略空格等字符
while (ch!='#')
{
cout<//Clion可能不支持键盘模拟EOF
int main()
{
using namespace std;
int ch;
int count=0;
cin.get(ch);
while (cin.fail()==false)
{
cout<//Clion可能不支持键盘模拟EOF
int main(void)
{
using namespace std;
int ch;
int count=0;
while ((ch=cin.get())!=EOF)
//测试ch的值是否为EOF，true则结束，否则继续
{
cout.put(char(ch));//强制类型转换为char类型
++count;
}
cout<
const int Cities=5;
const int Years=4;
int main()
{
using namespace std;
const char* cities[Cities]//创建指针数组分别指向五个字符串
{
"Gribble City",
"Gribbletown",
"New Gribble",
"San Gribble",
"Gribble Vista"
};
int maxtemps[Years][Cities]//创建2d数组，有Years行，Cities列
{
{96,100,87,101,105},//注意里面全部是逗号！！
{96,98,91,107,104},//且每个子数组都用花括号{}包围
{97,101,93,108,107},
{98,103,95,109,109}//最后一行的子数组后面没有逗号
};
cout<<"Maximun tempratures for 2008-2011\n\n";
for (int city=0;city
int main()
{
using namespace std;
cout<<"Enter the first intger: ";
int n1;//这里默认n1<=n2
cin>>n1;
cout<<"\nEnter the last integer: ";
int n2;
cin>>n2;
int sum=0;//sum需在外部定义,才不会每次循环都被初始化为0
for (n1;n1<=n2;n1++)//这里n1++或者++n1都无所谓
sum+=n1;
cout<<"\nSum: "<
#include
int main()
{
using namespace std;
cout.setf(ios_base::fixed,ios_base::floatfield);//修复小数点形式
const int ArSize=16;
array factrials;//array中的ArSize不能是变量！！
factrials[1]=factrials[0]=1;//设置初始第一个和第二个元素
int i=2;
long double Result=0;
for (i;i<=ArSize;i++)
{
factrials[i]=i*factrials[i-1];
Result=factrials[i];
}
cout<
int main()
{
using namespace std;
cout<<"Please enter a number and enter '0' to quit: ";
long double number=0;
int count=0;//设定计数器
int sum=0;//设定求和器
cin>>number;
while (number!=0)
{
++count;
sum+=number;//求和的关键
cout<<"Sum of all your input is "<>number;
}
cout<
int main()
{
using namespace std;
int count=1;
int D_interests;
double C_interests=100;
do
{
D_interests=100+(10*count);//Daphne是单利计算，每年固定10$
C_interests*=1.05;//Cleo是复利计算，每年都是实际金额的1.05倍
// 实际上应该使用次方计算，但是巧妙利用C++的*=和循环成功实现计算
count++;//年份计数器
}
while (D_interests>C_interests);
cout<<"Need "<
#include
int main()
{
using namespace std;
int m_books[12];
string Month[12]
{"January","February","March","April",
"May","June","July","August", "September",
"October","November","December"};
int m_all=0;//求和工具设定初始化
for (int i=0;i<12;i++)
{
cout << "Please enter sales of "<>m_books[i];
cout<<"The sales of "<
const int years=3;//只需修改此处即可调整不同的年份
const int Monthx=12;
int main()
{
using namespace std;
const char* Month[Monthx]//定义月份字符串，使用指针数组
{ "January", "February","March","April",
"May","June","July","August", "September",
"October","November","December"
};
int Books_sales [years][Monthx]//定义N年各个月销售数据的2D数组
{};//为空则全部初始化为0
int y_all[years] {0};//定义每年销售额总数计数数组
int m_all=0;//定义全部年份的销售额总数计数器
for (int i=1;i<(years+1);i++)
{
cout<<"Please enter sales of no."<>Books_sales[i][j];//一个个分别存储入2D数组
cout<<"The sales of no."<
struct car//结构声明
{
char Product_make[15];
int Product_year;
};
int main()
{
using namespace std;
cout<<"How many cars do you wish to catalog?";
int car_number;
cin>>car_number;
car* xv=new car[car_number];//创建动态指针数组
for (int i=0;i>xv[i].Product_year;
}
cout<<"\nHere is your collections: \n";
for (int i=0;i
#include
struct car//结构声明
{
std::string Product_make;
int Product_year;
};
int main()
{
using namespace std;
cout<<"How many cars do you wish to catalog? ";
int car_number;
cin>>car_number;
car* xv=new car[car_number];//创建动态指针数组
for (int i=0;i>xv[i].Product_year;
}
cout<<"\nHere is your collections: \n";
for (int i=0;i
#include
int main()
{
using namespace std;
char words[15];
int count=0;//单词循环计数器
cout<<"Enter the words(to stop,type the word done): \n";
while (strcmp(words,"done"))//使用strcmp函数执行比较，不同继续直到相同时跳出
{
count++;
cin>>words;
}
cout<<"You entered a total of "<<(count-1)<<" words.";
return 0;
}
//PP5.9.9
#include
#include
int main()
{
using namespace std;
string words;
int count=0;//单词循环计数器
cout<<"Enter the words(to stop,type the word done): \n";
while (words!="done")//使用string关系运算符比较，不同继续为true，直到相同时false跳出
{
count++;
cin>>words;
}
cout<<"You entered a total of "<<(count-1)<<" words.";
return 0;
}
//PP5.9.10
#include
int main()
{
using namespace std;
int i,j,n;
cout<<"Please enter the number of lines: ";
cin>>n;
for (i=1;i<=n;i++)//循环嵌套的关键：子循环的判定条件必须是主循环核心变量的关系式！！！
{
for (j=1;j<=n-i;j++)//第一次循环4次，然后3、2、1、0
cout<<".";
for (j=1;j
