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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;
+}

比较运算符.cpp

@@ -1,6 +1,8 @@
 //
 // Created by violet on 2026/2/28.
 //
+#include "cstring"
+
 #include "iostream"
 using namespace std;
 int main() {
@@ -9,5 +11,24 @@ int main() {
     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;
 }