添加文件io操作

base/CMakeLists.txt

@@ -17,4 +17,6 @@ foreach( appsourcefile ${APP_SOURCES} )
     get_filename_component( demo_name ${appsourcefile} NAME_WE )
     add_executable( ${demo_name} ${appsourcefile} )
 endforeach( appsourcefile ${APP_SOURCES} )
-#add_executable(formore formore.cpp)
+#add_executable(formore formore.cpp)
+add_executable(outfile file/outfile.cpp)
+add_executable(sumafile file/sumafile.cpp)

base/cctypes.cpp

@@ -0,0 +1,41 @@
+//
+// Created by nicemoe on 2021/8/7.
+//
+
+#include  <iostream>
+#include <cctype>
+
+using namespace std;
+/**
+ * 字符串函数库cctype
+ * @return
+ */
+int main()
+{
+    cout << "Enter text for analysis, and type @"
+            "to terminate input. \t";
+    char ch;
+    int whitespace = 0;
+    int digists = 0;
+    int chars = 0;
+    int punct = 0;
+    int others = 0;
+
+    cin.get(ch);
+    while (ch != '@')
+    {
+        if (isalpha(ch)) chars++;
+        else if (isspace(ch)) whitespace++;
+        else if (isdigit(ch)) digists++;
+        else if (ispunct(ch)) punct++;
+        else others++;
+        cin.get(ch);
+    }
+    cout << chars << " letters, "
+         << whitespace << " whitespace, "
+         << digists << " digists, "
+         << punct << " punctuations,"
+         << others << " others. \n";
+
+    return 0;
+}

base/enum.cpp

@@ -0,0 +1,53 @@
+//
+// Created by nicemoe on 2021/8/7.
+//
+/**
+ * 枚举
+ */
+#include  <iostream>
+
+using namespace std;
+
+enum
+{
+    red, orange, yellow, green, blue, violet, indigo
+};
+
+int main()
+{
+
+    int code;
+    cin >> code;
+
+    while (code >= red && code <= indigo)
+    {
+        switch (code)
+        {
+            case red:
+                cout << "Her lips were red. \n";
+                break;
+            case orange:
+                cout << "Her hair were orange. \n";
+                break;
+            case yellow:
+                cout << "Her shoes were yellow. \n";
+                break;
+            case green:
+                cout << "Her nails were green. \n";
+                break;
+            case blue:
+                cout << "Her sweatsuit were blue. \n";
+                break;
+            case violet:
+                cout << "Her eyes were violet. \n";
+                break;
+            case indigo:
+                cout << "Her mood were indigo. \n";
+                break;
+        }
+        cout << "Enter color code (0-6)";
+        cin >> code;
+    }
+    cout << "Bye \n";
+    return 0;
+}

base/file/outfile.cpp

@@ -0,0 +1,47 @@
+//
+// Created by nicemoe on 2021/8/7.
+//
+
+#include  <iostream>
+#include<fstream>
+
+using namespace std;
+
+int main()
+{
+    char automobile[50];
+    int year;
+    double a_price;
+    double d_price;
+
+    ofstream outFile;
+    outFile.open("charinfo.txt");
+
+    cout << "Enter the make and model of automobile: ";
+    cin.getline(automobile,50);
+    cout << "Enter the model year: ";
+    cin >> year;
+    cout << "Enter the original asking price: ";
+    cin >> a_price;
+    d_price = 0.913 * a_price;
+    //用一般的方式输出浮点型，例如Ｃ＋＋程序在控制台显示的时候大一点的数，显示的时候使用了科学计数法，使用该命令即可像一般的方式显示
+    cout << fixed;
+    //设置精确度为2，并返回上一次的设置。
+    cout.precision(2);
+    //显示浮点数小数点后面的零。
+    cout.setf(ios_base::showpoint);
+    cout << "Make and model: "<< automobile << endl;
+    cout << "Year: "<< year << endl;
+    cout << "Was asking $"<< a_price << endl;
+    cout << "Now asking $"<< d_price << endl;
+
+    outFile<<fixed;
+    outFile.precision(2);
+    outFile.setf(ios_base::showpoint);
+    outFile << "Make and model: "<< automobile << endl;
+    outFile << "Year: "<< year << endl;
+    outFile << "Was asking $"<< a_price << endl;
+    outFile << "Now asking $"<< d_price << endl;
+    outFile.close();
+    return 0;
+}

base/file/scores.txt

@@ -0,0 +1,3 @@
+18 19 18.5 13.5 14
+16 19.5 20 18 12 18.5
+17.5

base/file/sumafile.cpp

@@ -0,0 +1,72 @@
+//
+// Created by nicemoe on 2021/8/7.
+//
+
+#include  <iostream>
+#include <fstream>
+#include <cstdlib>
+
+using namespace std;
+const int SIZE = 60;
+
+/**
+ * scores.txt 内容如下
+ *
+ * 18 19 18.5 13.5 14
+ * 16 19.5 20 18 12 18.5
+ *  17.5
+ *
+ *
+ *
+ * 若编辑器不自动加换行符需要手动换行
+ * @return
+ */
+int main()
+{
+
+    char filename[SIZE];
+    ifstream inFile;
+    cout << "Enter name of data file: ";
+    cin.getline(filename, SIZE);
+    inFile.open(filename);
+    if (!inFile.is_open())
+    {
+        cout << "Could not open the file " << filename << endl;
+        cout << "pROGRAM TERMINATING. \n";
+        exit(EXIT_FAILURE);
+    }
+    double value;
+    double sum = 0.0;
+    int count = 0;
+
+//    inFile >> value;
+    //inFile.good() 该方法在没有任务错误且没有遇到结束符号的时候返回为true，
+    //inFile >> value 的返回值为inFile 在需要判断bool的时候 inFile的结果是inFile.good()
+    while (inFile >> value)
+    {
+        ++count;
+        sum += value;
+
+    }
+    if (inFile.eof()) cout << "End of file reached. \n";
+    else if (inFile.fail()) cout << "Input terminated by data mismatch.\n";
+    else cout << "Input terminated for unknown reason. \n";
+    if (count == 0) cout << "No data processed.\n";
+    else
+    {
+        cout << "Items read: " << count << endl;
+        cout << "Sum: " << sum << endl;
+        cout << "Average: " << sum / count << endl;
+    }
+    inFile.close();
+    return 0;
+}
+
+/*
+结果如下
+Enter name of data file: scores.txt
+End of file reached.
+Items read: 12
+Sum: 204.5
+Average: 17.0417
+*/

base/fun.cpp

@@ -0,0 +1,31 @@
+//
+// Created by nicemoe on 2021/8/7.
+//
+
+#include  <iostream>
+
+using namespace std;
+
+void temp(int &a, int &b)
+{
+    int tmp = a;
+    a = b;
+    b = tmp;
+}
+
+void temp2(int *a, int *b)
+{
+    int tmp = *a;
+    *a = *b;
+    *b = tmp;
+}
+
+int main()
+{
+    int m = 10, n = 23;
+    temp(m, n);
+    cout << m << "\t" << n << endl;
+    temp2(&m, &n);
+    cout << m << "\t" << n << endl;
+    return 0;
+}

base/goto.cpp

@@ -0,0 +1,18 @@
+//
+// Created by nicemoe on 2021/8/7.
+//
+
+#include  <iostream>
+
+using namespace std;
+
+int main()
+{
+    paris: cout << "You've just arrived at Paris.\n";
+    char ch;
+    cin >> ch;
+    if (ch == 'p') goto paris;
+
+
+    return 0;
+}

base/point.cpp

@@ -30,8 +30,20 @@ int main()
 
     char food[] = "carrots";
     strcpy(food, "flan");
-    cout << *(food + sizeof food -2);
+    cout << *(food + sizeof food - 2) <<endl;
 
+    int m = 10, n = 20;
+    //指针指向的地址的值不可以更改
+    const int *p = &m;
+    p = &n;
+    cout << *p <<endl;
+    //指针指向的地址不能更改
+    int * const p1 = &m;
+    *p1 = 30;
+    cout << *p1 <<" " << m<<endl;
+
+    //指针指向的地址和地址的值都不可以更改
+   const  int * const p2 = &m;
     return 0;
 }
 

base/structTest.cpp

@@ -0,0 +1,28 @@
+//
+// Created by nicemoe on 2021/8/7.
+//
+
+#include  <iostream>
+
+using namespace std;
+
+struct student
+{
+    string id;
+    string name;
+    int age;
+    int score;
+};
+
+int main()
+{
+
+    student stu[] = {
+            {"1", "1", 21, 100},
+            {"2", "2", 22, 100}
+    };
+
+    cout << (stu ) <<"\t" <<stu->name << endl;
+    cout << (stu + 1) <<"\t" <<(stu + 1)->name << endl;
+    return 0;
+}

base/test3.cpp

@@ -3,7 +3,7 @@
 //
 
 #include "include/test3.h"
-#include "iostream"
+#include <iostream>
 
 void print() {
     std::cout << "函数";

base/test4.cpp

@@ -3,7 +3,6 @@
 //
 
 #include <iostream>
-
 using namespace std;
 
 int main() {
@@ -11,5 +10,6 @@ int main() {
     y = (4 + x++) + (6 + x++);// 相当于 (4 +0)  + (6 +1)
     cout << y << endl;
     cout << x;
+    cout << y;
     return 0;
 }

base/testin1.cpp

@@ -0,0 +1,24 @@
+//
+// Created by nicemoe on 2021/8/7.
+//
+
+
+#include <iostream>
+using namespace std;
+
+int main()
+{
+
+    char ch;
+    int count = 0;
+    cout << "Enter characters; enter # to quit: \n";
+    cin >> ch;
+    while (ch != '#')
+    {
+        cout << ch;
+        ++count;
+        cin >> ch;
+    }
+    cout << endl << count << " characters read \n";
+    return 0;
+}

base/testin2.cpp

@@ -0,0 +1,25 @@
+//
+// Created by nicemoe on 2021/8/7.
+//
+
+
+#include <iostream>
+
+using namespace std;
+
+int main()
+{
+
+    char ch;
+    int count = 0;
+    cout << "Enter characters; enter # to quit: \n";
+    cin.get(ch);
+    while (ch != '#')
+    {
+        cout << ch;
+        ++count;
+        cin.get(ch);
+    }
+    cout << endl << count << " characters read \n";
+    return 0;
+}

base/testin3.cpp

@@ -0,0 +1,26 @@
+//
+// Created by nicemoe on 2021/8/7.
+//
+
+
+#include <iostream>
+
+using namespace std;
+
+int main()
+{
+
+    char ch;
+    int count = 0;
+    cout << "Enter characters; enter # to quit: \n";
+    cin.get(ch);
+//    while (!cin.fail())
+    while (cin)
+    {
+        cout << ch;
+        ++count;
+        cin.get(ch);
+    }
+    cout << endl << count << " characters read \n";
+    return 0;
+}

base/testin4.cpp

@@ -0,0 +1,24 @@
+//
+// Created by nicemoe on 2021/8/7.
+//
+
+
+#include <iostream>
+
+using namespace std;
+
+int main()
+{
+
+    char ch;
+    int count = 0;
+    cout << "Enter characters; enter # to quit: \n";
+    while ((ch = cin.get()) != EOF)
+    {
+        cout.put(char(ch));
+        ++count;
+    }
+    cout << endl << count << " characters read \n";
+
+    return 0;
+}

base/typedefTest.cpp

@@ -0,0 +1,18 @@
+//
+// Created by nicemoe on 2021/8/7.
+//
+
+#include <iostream>
+using namespace std;
+//typedef typeName aliasName
+typedef char byte;
+
+int main()
+{
+    byte a = 'A';
+    int m =a;
+    cout <<m;
+
+
+    return 0;
+}

base/waiting.cpp

@@ -0,0 +1,22 @@
+//
+// Created by nicemoe on 2021/8/7.
+//
+
+#include <iostream>
+#include <ctime>
+using namespace std;
+
+int main()
+{
+    cout << "Enter the delay time , in seconds: ";
+    float secs;
+    cin >> secs;
+    clock_t delay = secs * CLOCKS_PER_SEC;
+    cout <<"starting\n";
+    clock_t start = clock();
+    while (clock() - start < delay)
+        ;
+    cout<< "done \n";
+
+    return 0;
+}