add description metadata

Tyler Whitney · Tyler Whitney · commit c5e8be9b725f · 2020-09-14T16:49:51.000-07:00
diff --git a/docs/c-runtime-library/complex-math-support.md b/docs/c-runtime-library/complex-math-support.md
@@ -1,5 +1,6 @@
 ---
 title: "C complex math support"
+description: "Describes C-language complex math support in the Microsoft C runtime library (CRT)"
 ms.date: "05/14/2019"
 f1_keywords: ["c.complex"]
 helpviewer_keywords: ["complex numbers, math routines", "math routines", "complex numbers"]
diff --git a/docs/c-runtime-library/floating-point-support.md b/docs/c-runtime-library/floating-point-support.md
@@ -1,5 +1,6 @@
 ---
 title: "Math and floating-point support"
+description: "Describes floating-point support in the Microsoft Universal C Runtime library (UCRT)"
 ms.date: "9/14/2020"
 f1_keywords: ["c.math"]
 helpviewer_keywords: ["floating-point numbers, math routines", "math routines", "floating-point numbers"]
diff --git a/docs/c-runtime-library/recommendations-for-choosing-between-functions-and-macros.md b/docs/c-runtime-library/recommendations-for-choosing-between-functions-and-macros.md
@@ -1,5 +1,6 @@
 ---
 title: "Recommendations for Choosing Between Functions and Macros"
+description: "Explains the differences between using macros vs functions in the Microsoft C runtime library (CRT)"
 ms.date: "11/04/2016"
 f1_keywords: ["c.functions"]
 helpviewer_keywords: ["functions [CRT], vs. macros", "macros, vs. functions"]
