From 9e5d2baac1fe53221df6407a72c2255cb014cd0a Mon Sep 17 00:00:00 2001
From: Pawan Bangar <34831511+pawanbangar@users.noreply.github.com>
Date: Fri, 9 Nov 2018 00:52:35 +0530
Subject: [PATCH] ADD "Undefining Macro" (#21287)

* ADD "Undefining Macro"

we can undefine macro whenever we want in code by adding #undefine

* fix: markdown title format

* fix: minor grammar corrections

Capitalise first word and remove extra full stops
---
 guide/english/c/macros/index.md | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/guide/english/c/macros/index.md b/guide/english/c/macros/index.md
index 56424bf7bd..94123f9e2a 100644
--- a/guide/english/c/macros/index.md
+++ b/guide/english/c/macros/index.md
@@ -19,6 +19,13 @@ Is the same as write this:
 ```C
 printf("Value of PI: %d", 3.14);
 ```
+#### Undefining Macros
+After defining macros you can also undefine them at any point.
+just Type
+```C
+#undefine PI
+```
+This is used to use macros only for specific lines of code and again undefine it.
 
 #### Types of macros
 There are two type of macros. The `Object-like` macros, showed above, and the `Function-like` macros.
@@ -48,7 +55,6 @@ You get the equivallent of:
 ```C
 printf("Hello World!");
 ```
-
 #### More Information:
 <!-- Please add any articles you think might be helpful to read before writing the article -->
 [GCC Online Documentation: Macros](https://gcc.gnu.org/onlinedocs/cpp/Macros.html)