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shiyutangshiyutang
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11_manage_memory
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7 files changed

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lines changed

7 files changed

+229
-2
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‎10_define_new_class/10_define_new_class.cpp

+1-1
Original file line numberDiff line numberDiff line change
@@ -71,7 +71,7 @@ string PF_grade(double grade)
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int main()
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int dnc()
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{
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vector<Student_info_dnc> students;
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Student_info_dnc record;

‎10_define_new_class/10_define_new_class.h

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@@ -0,0 +1,30 @@
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//
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// Created by Daisy on 2020/12/14.
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//
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#include <string>
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#include <vector>
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#ifndef ACCLERATEDCPP_10_DEFINE_NEW_CLASS_H
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#define ACCLERATEDCPP_10_DEFINE_NEW_CLASS_H
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#endif //ACCLERATEDCPP_10_DEFINE_NEW_CLASS_H
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class Student_info_dnc{
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private:
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std::string n;
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double midterm, final;
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std::vector<double> homework;
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std::istream& readhw(std::istream&);
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public:
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std::istream& read(std::istream&);
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double grade() const;
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std::string name() const {return n;}
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bool valid() const;
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Student_info_dnc(): midterm(0),final(0) {};
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Student_info_dnc(std::istream&) ;
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};
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bool compare_dnc(const Student_info_dnc&, const Student_info_dnc&);
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std::string PF_grade(double );

‎11_manage_memory.cpp

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@@ -0,0 +1,161 @@
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//
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// Created by Daisy on 2020/12/14.
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//
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#include <vector>
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#include <string>
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#include <random>
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#include <iostream>
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#include <fstream>
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#include <cfloat>
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#include <cstring>
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#include <algorithm>
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#include <list>
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using namespace std;
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typedef double (*analysis_fp)(const std::vector<double >&);
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analysis_fp get_analysis_ptr(){
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analysis_fp pointer= nullptr;
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int* p = new int(42);
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++ *p;
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cout << *p << endl;
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delete p;
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int* pp = new int[20];
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cout << pp[0] << endl;
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vector<int> v(pp, pp+20);
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delete [] pp;
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return pointer;
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}
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string letter_grade(double grade)
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{
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static const double numbers[] =
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{97,94,90,87,84,80,77,74,70,60,0};
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static const char *letters[] =
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{"A+","A","A-","B+","B","B-","C+","C","C-","D","F"};
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static const std::size_t ngrades = sizeof(numbers) / sizeof(*numbers);
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for (std::size_t i = 0; i < ngrades; ++i)
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{
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if (grade>=numbers[i])
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return letters[i];
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};
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return "?\?\?";
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}
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void gradetoletter()
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{
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random_device rd;
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mt19937 mt(rd());
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uniform_int_distribution<int> dist(0,100);
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for(int i=0; i<30; ++i)
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{
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int grade = dist(mt);
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cout << "The grade is: " << grade
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<< ", And the letter grade is: "
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<< letter_grade(grade) << endl;
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}
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}
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int passparamsTomain(int argc, char** argv) // 指针数组的指针
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{
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if (argc>1)
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{
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int i;
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for(i=1; i< argc-1; ++i )
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cout << argv[i] << " ";
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cout << argv[i] << endl;
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}
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return 0;
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}
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int copyin()
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{
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ifstream infile(R"(E:\Projects\Accleratedcpp\in.txt)");
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ofstream outfile(R"(E:\Projects\Accleratedcpp\out.txt)");
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string s;
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while (getline(infile, s))
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outfile << s << endl;
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cout << "gfdgdsss{" << endl;
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return 0;
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}
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int copymultiin(int argc, char ** argv)
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{
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int failcnt = 0;
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ofstream outfile(R"(E:\Projects\Accleratedcpp\out.txt)");
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for (int i= 1; i<argc; ++i)
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{
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ifstream in(argv[i]);
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if(in)
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{
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string s;
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while(getline(in, s))
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outfile << s << endl;
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}else
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{
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cerr << "cannot open file" << argv[i] << endl;
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++ failcnt;
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}
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}
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return failcnt;
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}
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const char* duplicate_chars(const char * p)
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{
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size_t length = strlen(p) + 1;
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char* result = new char[length];
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copy(p,p+length, result);
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return result;
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}
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int testduplicate()
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{
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const char letters[] =
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{'a','v','A','B','C','e','d','D','F','\0'};
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const char* p = duplicate_chars(letters);
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for(std::size_t i =0; i < sizeof(letters)/sizeof((*letters)); ++i)
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{
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cout << *(p+i)<< endl;
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}
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cout << letters << endl;
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}
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template <class T,class M>
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M median(T v)
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{
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std::size_t size = sizeof(v)/sizeof(*v);
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if (size == 0)
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throw domain_error("median of an empty vector");
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sort(v, v+size);
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std::size_t mid = size / 2;
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return size %2 ==0 ? &((*(v+mid) + *(v+mid+1)) / 2) : v+mid;
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}
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int main()
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{
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int numbers[] =
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{3,2,4,67,3,1,2,4};
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int a = median(*numbers);
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cout << a << endl;
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for(std::size_t i =0; i < sizeof(numbers)/sizeof((*numbers)); ++i)
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{
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cout << *(numbers+i)<< endl;
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}
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vector<double> nums(numbers, numbers+8);
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double b = median(&nums);
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cout << b << endl;
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std::list<double > student;
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student.sort();
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return 0;
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}
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‎CMakeLists.txt

+1-1
Original file line numberDiff line numberDiff line change
@@ -3,4 +3,4 @@ project(Accleratedcpp)
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set(CMAKE_CXX_STANDARD 11)
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6-
add_executable(Accleratedcpp "5_organize program_data/original/pmain.cpp" "1_Hello World.cpp" 2_chars.cpp "3_loop and count.cpp" "4_use batch data.cpp" "5_organize program_data/original/grade.h" "5_organize program_data/original/Student_info.h" "5_organize program_data/original/Student_info_funcs.cpp" "5_organize program_data/original/median_funcs.cpp" "5_organize program_data/original/median.h" "5_organize program_data/original/grade_funcs.cpp" "7_Use library/use library.cpp" "5_organize program_data/memOptim/main.cpp" "5_organize program_data/memOptim/grade.h" "5_organize program_data/memOptim/grade_funcs.cpp" "5_organize program_data/memOptim/Student_info.h" "5_organize program_data/memOptim/Student_info_funcs.cpp" "5_organize program_data/main.cpp" "6_UseIterator extract_fail.cpp" "7_Use library/find_url.cpp" "7_Use library/StudentGrades.cpp" "7_Use library/6-1.cpp" "7_Use library/using library.h" 8_CorrelatedContainer.cpp "7_Use library/StudentGrade.h" 8_MakeaSentence.cpp 9_Generics.cpp 10_define_new_class/10_define_new_class.cpp 10_define_new_class/10_define_new_class.h)
6+
add_executable(Accleratedcpp "5_organize program_data/original/pmain.cpp" "1_Hello World.cpp" 2_chars.cpp "3_loop and count.cpp" "4_use batch data.cpp" "5_organize program_data/original/grade.h" "5_organize program_data/original/Student_info.h" "5_organize program_data/original/Student_info_funcs.cpp" "5_organize program_data/original/median_funcs.cpp" "5_organize program_data/original/median.h" "5_organize program_data/original/grade_funcs.cpp" "7_Use library/use library.cpp" "5_organize program_data/memOptim/main.cpp" "5_organize program_data/memOptim/grade.h" "5_organize program_data/memOptim/grade_funcs.cpp" "5_organize program_data/memOptim/Student_info.h" "5_organize program_data/memOptim/Student_info_funcs.cpp" "5_organize program_data/main.cpp" "6_UseIterator extract_fail.cpp" "7_Use library/find_url.cpp" "7_Use library/StudentGrades.cpp" "7_Use library/6-1.cpp" "7_Use library/using library.h" 8_CorrelatedContainer.cpp "7_Use library/StudentGrade.h" 8_MakeaSentence.cpp 9_Generics.cpp 10_define_new_class/10_define_new_class.cpp 10_define_new_class/10_define_new_class.h 11_manage_memory.cpp 10_define_new_class/10_define_new_class.h)

‎in.txt

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I would like to eat a bunch of fruits.
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I would like to eat a bunch of fruits.
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I would like to eat a bunch of fruits.
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I would like to eat a bunch of fruits.
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I would like to eat a bunch of fruits.
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I would like to eat a bunch of fruits.
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I would like to eat a bunch of fruits.
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I would like to eat a bunch of fruits.
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I would like to eat a bunch of fruits.

‎in2.txt

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I would like to eat a bunch of food.
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I would like to eat a bunch of food.
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I would like to eat a bunch of food.
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I would like to eat a bunch of food.
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I would like to eat a bunch of food.
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I would like to eat a bunch of food.
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I would like to eat a bunch of food.
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I would like to eat a bunch of food.
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I would like to eat a bunch of food.

‎out.txt

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I would like to eat a bunch of fruits.
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I would like to eat a bunch of fruits.
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I would like to eat a bunch of fruits.
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I would like to eat a bunch of fruits.
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I would like to eat a bunch of fruits.
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I would like to eat a bunch of fruits.
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I would like to eat a bunch of fruits.
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I would like to eat a bunch of fruits.
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I would like to eat a bunch of fruits.
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I would like to eat a bunch of food.
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I would like to eat a bunch of food.
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I would like to eat a bunch of food.
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I would like to eat a bunch of food.
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I would like to eat a bunch of food.
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I would like to eat a bunch of food.
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I would like to eat a bunch of food.
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I would like to eat a bunch of food.
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I would like to eat a bunch of food.

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