Update: added new files for 0x0D-preprocessor

Author: ahmaddev-codes

0x0D-preprocessor/0-object_like_macro.h

@@ -0,0 +1,18 @@
+## 0x0D-preprocessor
+
+### [0-object_like_macro.h](./0-object_like_macro.h)
+- Create a header file that defines a macro named SIZE as an abbreviation for the token 1024.
+
+### [1-pi.h](./1-pi.h)
+- Create a header file that defines a macro named PI as an abbreviation for the token 3.14159265359.
+
+### [2-main.c](./2-main.c)
+- Write a program that prints the name of the file it was compiled from, followed by a new line.
+
+You are allowed to use the standard library
+
+### [3-function_like_macro.h](./3-function_like_macro.h)
+- Write a function-like macro ABS(x) that computes the absolute value of a number x.
+
+### [4-sum.h](./4-sum.h)
+- Write a function-like macro SUM(x, y) that computes the sum of the numbers x and y.

0x0D-preprocessor/1-pi.h

@@ -0,0 +1,14 @@
+#include <unistd.h>
+
+/**
+ * _putchar - writes the character c to stdout
+ * @c: The character to print
+ *
+ * Return: On success 1.
+ * On error, -1 is returned, and errno is set appropriately.
+ */
+
+int _putchar(char c)
+{
+	return (write(1, &c, 1));
+}