CodesJava

Easy learning with example program codes

c preprocessor undefine


C #undef:

A macro value in C replaces a part of a program with a value already defined by #define directive. The #undef is a preprocessor directive which is used to undefine the value defined by #define.

Syntax:

#undef macro_Name

Example:

#include<stdio.h>  
#define e 2.718
#undef e
void main()
{    
printf("e :%f\n",e );    
}

Output

error: 'e' undeclared
Posted in C   
Sign Up/ Sign In
Ask a Question


Industrial Training

We offers Placement Oriented Training on Java, Spring, JSF, Hibernate, PHP, AngularJS, Angular 4, PLSQL, Oracle BI Publisher etc. We also provides Online training, please mail us at hr@codesjava.com.

Development

We also provides the Development services for Website Development , Java Development, PHP Development, Android App Development etc. You can contact us on hr@codesjava.com.

Copyright © 2018 CodesJava DMCA.com Protection Status SiteMap Reference: Java Wiki