c考试参考资料.doc

1.产生(a,b)屮size个随机数，可重复#include "stdafx.h"#inelude <iostream>#include <cstdlib>#inelude <iterator>#include <algorithm>using namespace std;class mi_rand{public:mi_rand (int start_pos, int end_pos): a(start_pos), b(end_pos) {}unsigned operator () () {return rand() % (b-a+1) + a;//(a,b)}private: int a, b;};int _tmain(int argc, _TCHAR* argv[]){const int SIZE = 20;int array[SIZE];gen erate _n (array, SIZE, mi_ra nd (1, 30));copy (array, array + SIZE,ostream_iterator<int> (cout,""));cout« endl;return 0;}2.产生(1, 30)中size个随机数，可重复#include "stdafx.h"#include <iostream>#inelude <cstdlib>#inelude <algorithm>using namespace std;int main(){const int SIZE = 20;int array[SIZE];generate_n (array, SIZE, [] () {return rand() % 30 + 1;});for_each (array, array + SIZE,[](int a){ cout« a « " ”；});return 0;}3.函数指针,5*2 = 10#include "stdafx.h"#inelude <iostream>#inelude vfunctional>using namespace std;functionvint(void)> multiplyBy2Lambda(int x){return [=]()->int{return 2*x;};}int main(){auto fn = multiplyBy2Lambda(5);//autocout« fn() « endl;return 0;}4.依次产生2的n次方，vector中有20个元素#include "stdafx.h"#inelude <vector>#include <algorithm>#inelude <iostream>using namespace std;int main(){vector<int> vec(10);int value = 1;generate(vec.begin(), vec.end(), [&value]{value*=2; return value;}); for (auto& i: vec) cout« i « "cout« endl;return 0;}5.String.引出一个临时文件名#include "stdafx.h"#include ,,iostream H#include "string"using namespace std;int main(int argc, char* argv[]){string filename,basena me’extname’tmpname;const string suffixC'tmp11);string file="abc.tmp";for(int i=0;i<argc;i++){file name=argv[i];string::size_type idx=filename.find(T);if(idx==stri ng::n pos){tmp name 二file name+T+suffix;}else{base name=file name.substr(O」dx); extn ame=file name・substr(idx+l);if(ext name.empty()) {tmp name二file name;tmp name+二suffix;}else 讦(extname==suffix){tmp name 二file name;tmp name.replace(idx+bext name.size()/xxx”)；}else{tmpn ame=file name;tmp name.replace(idx+l，stri ng::n pos/tmp");}}cout«file namevv"二二F'vvtmp namevve ndl;return 0;}6.本地化#include "stdafx.h"#inelude <iostream>#include <locale>using namespace std;int _tmain(int argc, _TCHAR* argv[]){locale locUSEng("English_United States");locale locBritEng("English_Great Britain");wstring dollars = use_facet<moneypunct<wchar_t»(locUSEng).curr_symbol();wstring pounds = use_facet<moneypunct<wchar_t»(locBritEng).curr_symbol();wcout« L H ln the US, the currency symbol is 中” « dollars « endl;wcout« L”In Great Britain, the currency symbol is H « pounds « endl;return 0;} #inelude "stdafx.h”#include <iostream>#inelude <string>#include <locale>using namespace std;int _tmain(int argc, _TCHAR* argv[]){locale loc("English_United States");//windows 下编译//gcc locale loc("en_US");;if (().find("en_US") == string::npos &&()・find「United States") == string::npos) { wcout « L n Welcome non-U.S・ English speaker!11« endl;}else{wcout« L"Welcome U.S. English speaker!" « endl;}return 0;}7.指针#include "stdafx.h"#inelude <memory>using namespace std;〃强制定义通过mallocfree来分配，回收内存int* malloc_int(int value){int* p = (int*)malloc(sizeof(int));*p = value;return p;}class Simple{private: int i;public: int getl(){return i;}void setl(int i){this->i=i;}}；int main(){shared_ptr<int> mylntSmartPtr(mallocJnt(42), free);shared_ptr<int> mylntSmartPtrl(new int(42));shared_ptr<Simple> myClassSmartPtr(new Simple)));return 0;}8.正则表达式#include "stdafx.h"#include <iostream>#inelude <string>#inelude <regex>using namespace std;int main(){regex r("\\d{4}/(?:0?[291 l[0-2])/(?:0?[l-9] | [1-2][0-9] 13[0-l])$H); while (true) { cout« "Enter a date (year/month/day) (q=quit):n;string str;讦(!getline(cin, str) 11 str == "q")break;if (regex_match(str, r))cout« " Valid date.11« endl;elsecout« " Invalid date!" « endl;return 0;} #include H stdafx.h H#inelude <iostream>#inelude <string>#inelude <regex>using namespace std;int _tmain(int argc, _TCHAR* argv[]){ regex r("[0・9]{3,4}・[0・9]{7,8}$“);while(true){cout« "Enter a telephone(num・num)(q=quit):H; string str;if(!getline (cin, str) 11 str == "q") break;if(regex_match(sto r))cout« "Valid number.'1 « endl;else cout« "Invalid number.H « endl;}return 0;} #inelude H stdafx.h H #include <iostream> #inelude <string>#inelude <regex>using namespace std;int _tmain(int argc, _TCHAR* argv[]){regex r("([0・9A・Za・z\\・_\\.]+)@([0・9a・z]+\\.[a・z]{2,3}(\\.[a・z]{2})?)$“); while(true){ cout« "Enter a email-address(q=quit):n;string str;if(!getline (cin, str) 11 str== "q")break;if(regex_match(stG r))cout« ''Valid email-address.H « endl;else cout« "Invalid email-address.11 « endl;}return 0;9.C++11多线程线程…操作系统调度的最小单位。