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halloall · Jun 9, 2021 · 72dfd23 · 72dfd23
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diff --git a/-test b/-test
diff --git a/test b/test
diff --git a/test.cpp b/test.cpp
@@ -0,0 +1,28 @@
+#include <iostream>
+using namespace std;
+
+// 变量声明
+extern int a, b;
+extern int c;
+extern float f;
+
+int main ()
+{
+  // 变量定义
+  int a, b;
+  int c;
+  float f;
+
+  // 实际初始化
+  a = 10;
+  b = 20;
+  c = a + b;
+
+  cout << c << endl ;
+
+  f = 70.0/3.0;
+  cout << f << endl ;
+
+  return 0;
+}
+