.gitignore

@@ -86,10 +86,9 @@ Module.symvers
 Mkfile.old
 dkms.conf
 
-# 自定义过滤
+# 自定义
 */output
 *.i
 *.s
 *.o
 *.swp
-.vscode

day4/d10.cpp

@@ -1,15 +0,0 @@
-#include <iostream>
-
-using namespace std;
-
-int main()
-{
-    char c = 'a'; // 1B
-    int m = 2;    // 4B
-    // 小字节转大字节, 会自动转换
-    m += c; // 先将c转换为int,再相加
-    cout << "m = " << m << endl;
-    // 大字节转小字节,会丢失精度,需要强制类型转换
-    cout << "m to char is " << (char)m << endl;
-    return 0;
-}

day4/d11.cpp

@@ -1,11 +0,0 @@
-#include <iostream>
-
-using namespace std;
-
-int main()
-{
-    cout << "'0' = " << (int)'0' << endl;
-    cout << 0 << endl;
-    cout << (int)'\0' << endl;
-    return 0;
-}

day4/d12.cpp

@@ -1,24 +0,0 @@
-#include <iostream>
-#include <regex> // 引入正则表达式库
-
-using namespace std;
-
-int main()
-{
-    string x;
-    cout << "输入一个字符:" << endl;
-    cin >> x;
-
-    regex regex_lower("[a-z]");
-    regex regex_upper("[A-Z]");
-    cout << regex_match(x, regex_lower) << regex_match(x, regex_upper) << endl;
-    // 正则表达式
-    if (regex_match(x, regex_lower)) // regex_match 匹配正则表达式
-    {
-        cout << (char)(x.at(0) - 32) << endl; // .at(0) 获取第一个字符
-    }
-    else if (regex_match(x, regex_upper))
-    {
-        cout << (char)(x.at(0) + 32) << endl;
-    }
-}

day4/d13.cpp

@@ -1,24 +0,0 @@
-#include <string>
-#include <iostream>
-
-using namespace std;
-
-int main()
-{
-    // 字符串打印遇到\0则结束打印
-    string str1 = "abc\0good"; // abc\0good\0
-    cout << str1 << str1 << endl;
-    cout << "sizeof str1 = " << sizeof(str1) << endl; // 32B 32*8=256位
-
-    char str2[] = "disen666"; // 字符数组, 实际上也是一个字符串
-    cout << "str2 = " << str2 << endl;
-
-    char str3[] = {'d', 'i', 's', 'e', 'n'}; // 自动添加 '\0'
-    cout << "str3 = " << str3 << endl;
-    cout << "sizeof str3 = " << sizeof(str3) << endl; // 5B, 没算 '\0'
-
-    string str4 = "a";
-    cout << "sizeof str4 = " << sizeof(str4) << endl; // 32B 32*8=256位
-
-    return 0;
-}

day4/d8.cpp

@@ -1,13 +0,0 @@
-#include <iostream>
-
-using namespace std;
-
-int main()
-{
-    int x1, y1, x2, y2;
-    cout << "请输入两个点坐标, 格式如 x1 y1 x2 y2" << endl;
-    cin >> x1 >> y1 >> x2 >> y2;
-    cout << "P1(" << x1 << "," << y1 << ")"
-         << " P2(" << x2 << "," << y2 << ")" << endl;
-    return 0;
-}

day4/exercise_2.4.5.2.cpp

@@ -1,12 +0,0 @@
-#include <iostream>
-
-using namespace std;
-
-int main()
-{
-    int a, b;
-    cout << "输入两个数:" << endl;
-    cin >> a >> b;
-    cout << "最大值为: " << (a > b ? a : b) << endl;
-    return 0;
-}