12

c++常量类型的确定.cpp

@@ -0,0 +1,18 @@
+//
+// Created by violet on 2026/2/24.
+//
+#include "iostream"
+#include "windows.h"
+int main() {
+    SetConsoleOutputCP(CP_UTF8);
+    long long int i1 = 2212345678;
+    std::cout<<sizeof(i1)<<i1<<std::endl;
+    char a = 3;
+    char b = 32;
+    char c = 16;
+    char d = 17;
+    char e = '5';
+    char f = 126;
+    std::cout << f << std::endl;
+    std::cout <<c<<a<<b<<d<<e<<std::endl;
+}

cin数据输入.cpp

@@ -0,0 +1,26 @@
+//
+// Created by viole on 2026/2/25.
+//
+#include <iostream>
+#include "windows.h"
+using namespace std;
+int main() {
+    SetConsoleOutputCP(CP_UTF8);
+    string name;
+    double height;
+    int age;
+    cout << "请输入你的姓名:" <<endl;
+    cin >> name;
+
+    cout << "请输入你的身高（cm）:" <<endl;
+    cin >> height;
+
+    cout << "请输入你的年龄:" <<endl;
+    cin >> age;
+    cout << "--------"<<endl;
+    cout << "信息输入完成，您的信息如下："<<endl;
+    cout<<"姓名："<<name<<endl;
+    cout<<"身高："<<height<<endl;
+    cout<<"年龄："<<age<<endl;
+    return 0;
+}

if逻辑判断语句.cpp

@@ -0,0 +1,21 @@
+//
+// Created by violet on 2026/3/3.
+//
+#include "iostream"
+using namespace std;
+int main() {
+    /*
+     * if（）{}
+     */
+    cout<<"今天发工资了"<<endl;
+    int money;
+    cout<<"请输入小明发的工资"<<endl;
+    cin>>money;
+    if (money>=10000) {
+        cout<<"小明去买电脑了"<<endl;
+        money -= 9900;
+
+    }
+    cout<<"小明工资还剩"<<money<<endl;
+    return 0;
+}

三元运算符.cpp

@@ -0,0 +1,25 @@
+//
+// Created by violet on 2026/3/3.
+//
+#include "iostream"
+using namespace std;
+int main() {
+    int num1,num2;
+
+        // while (true){
+        //
+        //         cout<<"请输入num1的值"<<endl;
+        //         cin>>num1;
+        //         cout<<"请输入num2的值"<<endl;
+        //         cin>>num2;
+        //         string value = num1>num2?"num1>num2":"num1<=num2";
+        //         cout<<value<<endl;
+        //
+        // }
+    cout<<"请输入小明第一次考试的成绩(0-100):"<<endl;
+    cin>>num1;
+    cout<<"请输入小明第二次考试的成绩(0-100):"<<endl;
+    cin>>num2;
+    cout<<"对小明的考试成绩进行判断，结果是："<<(num1<num2?"买糖":"不买糖")<<endl;
+    return 0;
+}

字符串.cpp

@@ -0,0 +1,14 @@
+
+//
+// Created by violet on 2026/2/24.
+//
+#include <iostream>
+namespace std {
+    int x =1;
+}
+int main() {
+    int a = 1;
+    auto b = std::x+1;
+    std::cout <<b<< std::endl;
+    return 0;
+}

字符串拼接.cpp

@@ -0,0 +1,15 @@
+//
+// Created by viole on 2026/2/24.
+//
+#include "iostream"
+using namespace std;
+int main() {
+    string a = "1";
+    string b = "12";
+    string c = "13";
+    string d = "14";
+    int e = 12;
+    cout << a+b<<c+d<<a+to_string(e)<< endl;
+    bool b1 = true;
+    return 0;
+}

实型数据类型.cpp

@@ -0,0 +1,22 @@
+//
+// Created by viole on 2026/2/24.
+//
+#include "iostream"
+#include "windows.h"
+using namespace std;
+int main() {
+    SetConsoleOutputCP(CP_UTF8);
+    //float 单精度浮点数，4字节，6-7位的有效位数
+    float num1 = 1234567890;
+    float num2 = 1.234567890;
+    double num3 = 1234567890.1234567890;
+    long double num4 = 1234567890.1234567890;
+    cout<<fixed;
+    cout.width(20);
+    cout<<num1<<endl;
+    cout<<num2<<endl;
+    cout<<sizeof(num2)<<endl;
+    cout<<num3<<","<<sizeof(num3)<<endl;
+    cout<<num4<<","<<sizeof(num4)<<endl;
+
+}

布尔数据类型.cpp

@@ -0,0 +1,11 @@
+//
+// Created by viole on 2026/2/25.
+//
+#include "iostream"
+using namespace std;
+int main() {
+    bool flag = 1;
+    bool flag2 = 0;
+    cout << flag << endl;
+    cout << flag2 << endl;
+}

比较运算符.cpp

@@ -0,0 +1,34 @@
+//
+// Created by violet on 2026/2/28.
+//
+#include "cstring"
+
+#include "iostream"
+using namespace std;
+int main() {
+    //==相等 !=不等 >大于 <小于 <=小于等于>=大于等于
+    int num1 =3;
+    int num2 =4;
+    bool r1 = (num1!=num2);
+    cout<<r1<<endl;
+    //字符串要用strcmp比较，否则只能比较内存地址
+    char s1[]="hello";
+    char *s2 = "hello";
+    cout<<(strcmp(s1,s2))<<endl;
+    char s3[] = "a";
+    char *s4 = "b";
+    cout<<(strcmp(s4,s3))<<endl;
+
+    cout<<"字面量字符串"<<strcmp("a","b")<<endl;
+    //只要有一个c++风格的字符串，就可以用比较运算符来比较，比较他们的值而不是内存地址
+    string s5 = "a";//c++风格字符串
+    string s6 = "a";
+    cout<<(s5== s6)<<endl;
+    cout<<(1==1 && 2==2)<<endl;
+    cout<<(1==2 && 2==2)<<endl;
+    cout<<(1==2 || 2==3)<<endl;
+    cout<<(1==2 || 2==2)<<endl;
+    bool s123 = 100;
+    cout<<(s123)<<endl;
+    return 0;
+}

算数运算符.cpp

@@ -0,0 +1,19 @@
+//
+// Created by violet on 2026/2/28.
+//
+#include "iostream"
+using namespace std;
+int main() {
+    //单目（一个操作数）运算符
+    int num1 = +10;
+    int num2 = -10;
+    cout <<num1<<","<<num2<<endl;
+    //双目（有两个操作数）操作符
+    int num3 = 5+5;
+    int num4 = 5-3;
+    int num5 = 5*5;
+    int num6 = 10/3;
+    int num7 = 10%3;
+    cout<<num3<<","<<num4<<","<<num5<<","<<num6<<","<<num7<<endl;
+    return 0;
+}

赋值运算符.cpp

@@ -0,0 +1,23 @@
+//
+// Created by violet on 2026/2/28.
+//
+#include "iostream"
+using namespace std;
+int main() {
+    int num =2,num1,num2,num3,num4,num5;
+    num +=3;cout<<num<<endl;
+    bool a = true;
+    cout<<a<<endl;
+
+
+    num -=2,cout<<num<<endl,
+    num *=2,cout<<num<<endl,
+    num /=3,cout<<num<<endl,num %=2,cout<<num<<endl;
+    int money = 50;
+    money-=5;
+    money+=10;
+    money-=2;
+    money*=2;
+    cout<<money<<endl;
+    return 0;
+}

转义字符.cpp

@@ -0,0 +1,13 @@
+//
+// Created by violet on 2026/2/24.
+//
+//转义字符：将普通的字符使用\作为开头，将其含义进行转换，对照得到ascii表的控制字符的功能
+//\n \t \\ \'\"
+#include "iostream"
+#include "windows.h"
+int main() {
+    SetConsoleOutputCP(CP_UTF8);
+    std::cout<<"aa\tbbbb"<< std::endl;
+    std::cout<<"aa\t\tbbbb"<<std::endl;
+    std::cout<<"aa\taabbbbaabbbb"<<std::endl;
+}