diff --git a/sizeof函数.cpp b/sizeof关键字函数.cpp
similarity index 100%
rename from sizeof函数.cpp
rename to sizeof关键字函数.cpp
diff --git a/实型数据类型.cpp b/实型数据类型.cpp
new file mode 100644
index 0000000..fed6403
--- /dev/null
+++ b/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;
+
+}
\ No newline at end of file