Regular Expression Iterator

標題：使用迭代器匹配字串
VC++ (regex.cpp)：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

#include <iostream> #include <regex> //string lib here using namespace std; int main(int argc, char* argv[]) { string str = "facet normal -8.944272e-001 4.472136e-001 0.000000e+000"; regex pattern("[+-]?[0-9]\\.[0-9]+[eE][+-]?[0-9]+"); auto words_begin = sregex_iterator(str.begin(), str.end(), pattern); auto words_end = sregex_iterator(); cout << "Found " << std::distance(words_begin, words_end) << " numbers:\n"; for (sregex_iterator i = words_begin; i != words_end; ++i) { cout << atof( ((smatch) *i).str().c_str() ) << '\n'; } system("pause"); return 0; }

說明：
使用迭代器匹配字串。

Regular Expression to match IP Address

標題：使用正規表示法驗證IP
VC++ (regex.cpp)：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

#include <iostream> #include <regex> //string lib here using namespace std; int main(void) { string ip = "192.168.1.100"; smatch results; regex pattern("([0-9]+)\\.([0-9]+)\\.([0-9]+)\\.([0-9]+)"); if(regex_match(ip, results, pattern)) { cout << atof( results[1].str().c_str() ) << endl; cout << atof( results[2].str().c_str() ) << endl; cout << atof( results[3].str().c_str() ) << endl; cout << atof( results[4].str().c_str() ) << endl; } else { cout << "Not Match." << endl; } system("pause"); return 0; }

說明：
簡單使用正規表示法驗證IP，並印出每個區段數值。

Bisection method using Recursion

標題：使用遞迴函式計算二分法

使用遞迴
VC++ (recursion.cpp)：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

//Chapter 3 - Recursion #include <iostream> using namespace std; const int No = 1000; const double tolerance = 0.00001; const double minimal = 0; const double maximal = 1; double equation(double); double determine(double, double, double=equation(minimal), int=0); int main(void) { cout << "Best: " << scientific << determine(minimal, maximal) << endl; system("pause"); return 0; } double determine(double a, double b, double fa, int n) { double p = 0, fp = 0; p = a+(b-a)/2; fp = equation(p); //cout << dec << n << '\t' << scientific << p << endl; if(( fp==0 || (b-a)/2 < tolerance ) || n >= No) return p; return (fa*fp>0) ? determine(p, b, fp, n+1) : determine(a, p, fa, n+1); } double equation(double x) { return x - 1/pow(2.0, x); } /*double equation(double x) { return pow(x, 4)-2*pow(x, 3)-4*pow(x, 2)-4*x+4; }*/

不使用遞迴
VC++ (bisectionMethod.cpp)：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

//Chapter 3 - Bisection Method #include <iostream> using namespace std; const int No = 1000; const double tolerance = 0.00001; const double minimal = 0; const double maximal = 1; double equation(double); int main(void) { int i=0; double x=0, y=0, fa=0, fp=0, p=0, a=0, b=0; a = minimal; b = maximal; fa = equation(a); while(i<No) { p = a+(b-a)/2; fp = equation(p); if(fp==0 || (b-a)/2 < tolerance) { break; } if(fa*fp>0) { a = p; fa = fp; } else { b = p; } i++; } cout << scientific << p << endl; system("pause"); return 0; } /* double equation(double x) { return pow(x, 4)-2*pow(x, 3)-4*pow(x, 2)-4*x+4; } */ double equation(double x) { return x - 1/pow(2.0, x); }

說明：
比較遞迴與不遞迴方式計算二分法。

Default Argument

標題：函式預設引數
VC++ (defaultArgument.cpp)：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

//Chapter 3 - Default Argument #include <iostream> using namespace std; double circumference(double, double = 3.14); int main(void) { //scientific使用科學記號輸出 cout << scientific << circumference(1) << endl; cout << scientific << circumference(1, acos(-1.0)) << endl; system("pause"); return 0; } double circumference(double d, double pi) { return d * pi; }

範例結果：
3.140000e+000 3.141593e+000

說明：
基礎的函式預設引數範例。

Simple Regular expression

標題：基本正規表示法
VC++ (regex.cpp)：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

#include <iostream> //#include <string> #include <regex> //string lib here using namespace std; int main(void) { int r = 0; string number = ""; //匹配模型 regex number_format("[0-9]{1,5}"); //隨機數 srand(time(NULL)); r = rand()%10; cout << "Input number:" << endl; cin >> number; //資料比對 if(regex_match(number, number_format)) { cout << number << " * " << r << " = " << stoi(number) * r << endl; } else { cout << "Not match." << endl; } system("pause"); return 0; }

說明：
基本的正規表示法進行數字的匹配，並乘上一隨機數。

For statement

標題：for迴圈語句
VC++ (forstatement.cpp)：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

//Chapter 1 - for statement #include <iostream> using namespace std; int main(void) { int i = 0, j = 0, len = 0; const double PI = acos(-1.0), DEGREE = 180.0/PI; for(i=0;i<=180;i+=10) { len = (int)( sin( i/DEGREE )*30 ); for(j=0;j<len;j++) { cout << '*'; } cout << " " << len << endl; } system("pause"); return 0; }

範例結果：

說明：
基本使用for迴圈印出sin波範例

If...else...statements

標題：if else 判斷語句
VC++ (ifstatement.cpp)：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

//Chapter 1 - if statement #include <iostream> #include <string> using namespace std; int main(void) { int len = 0; string footballer = ""; cout << "Input Name:"; cin >> footballer; len = footballer.length(); if(len != 0 && len <= 10) { cout << footballer << endl; } else { cout << "Word length of less than 10" << endl; } system("pause"); return 0; }

說明：
基本if else判斷語句的使用

Cin and cout command

標題：輸入與輸出命令
VC++ (variable.cpp)：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

//Chapter 1 - cin and cout #include <iostream> #include <string> using namespace std; int main(void) { int age = 19, year = 2011; string footballer = ""; cout << "Input Name:"; cin >> footballer; cout << footballer << " is a Brazilian footballer.\n"; cout << "At the age of " << age << ", " << footballer <<" won the " << year << " South American Footballer\n"; system("pause"); return 0; }

說明：
基本輸入與輸出命令

Variable type and size

標題：變數型態與大小
VC++ (datatype.cpp)：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

//Chapter 1 - datatype #include <iostream> using namespace std; int main(void) { cout << "type\tbyte" << endl; cout << "int\t" << sizeof(int) << endl; //4 cout << "long\t" << sizeof(long) << endl; //4 cout << "float\t" << sizeof(float) << endl; //4 cout << "double\t" << sizeof(double) << endl; //8 cout << "char\t" << sizeof(char) << endl; //1 cout << "bool\t" << sizeof(bool) << endl; //1 system("pause"); return 0; }

說明：
基本的變數型態與大小

Cout example

標題：cout範例
VC++ (cout.cpp)：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

//Chapter 1 - Part1 //引用函式庫，使用標準函式庫 #include <iostream> //標準函式庫的命名空間 using namespace std; //主函式寫法 int main(void) { //印出整數及文字 cout << 10 << endl; cout << "Neymar" << endl; //送出Command命令pause system("pause"); //回傳終止 return 0; }

說明：
基礎cout範例程式