#define Macros Nesting – Computer Sir Ki Class

Login


Lost your password?

Don't have an account ?
Register (It's FREE) ×
  

Login
[lwa]



Code Learning #CPP#4587    siteicon   siteicon  

#define Macros Nesting

Understanding how #define macros can be nested (use of one macros expression as a part of another macros expression)

Learning Objectives

  • Understanding the use of #define macro expression being nested as part of another #define macro expression

Source Code

TC++ #4587

 

Source Code

Run Output

Principal = 203
Rate = 5
Time = 2
Simple Interest = 20
Amount = 223

Code Understanding

#define SI(p,r,t) p*r*t/100
First define expression with use of simple interest formula

#define AMT(p,r,t) p+SI(p,r,t)
Second define expression where expression of SI has been nested.

int main(){
int p=203,r=5,t=2 ;
Some test values for p, r and t have been assigned.

cout<<“Principal = “<<p<<endl; cout<<“Rate = “<<r<<endl; cout<<“Time = “<<t<<endl;
Printing user given values.

cout<<“Simple Interest = “<<SI(p,r,t)<<endl;
Use of first define to expression conversion.

cout<<“Amount = “<<AMT(p,r,t)<<endl;
Use of second define where SI expression is already nested.

return 0;}

Notes

  • #define macros can give immense possibility of dynamic compilation. This also helps in version control of C++ programs where not only expression values are easily definable but even expressions are definable.

 

Common Errors

  • Since data types are not checked while declaring #define macro expressions, so the user must check the data type himself.


Suggested Filename(s): pp-macn.cpp, define-macros-nesting.cpp



Share

sunmitra| Created: 2-Sep-2018 | Updated: 5-Sep-2018|






×
Introductory Sessions Beginning to Program Tokens Keyword and Identifiers Data Types Variables and Constants Operators Simple User Input Building Expressions and Formulas Simple Real World Problems Simple If and If Else Multiple-Nested-Ladder of If Else Switch case selection Simple Loops Tricks in Loops - break continue scope Loop Applications - Handling numerals Series printing loops Nested Loops Pattern printing loops Number Varieties and Crunches String Handling (Null Terminated) Strings - string class type Functions (Built-in) Functions - user defined Functions Reference Passing/Returning Arrays Concepts and 1-D Arrays Array Data Management Two dimensional arrays and Matrices Structures Basics Structures passing/returning Display Using IO Manipulation Display Using C Formatting Tricks User Defined Data Types Enumerated Types Preprocessor Directives And Macros Exception Handling Programming Paradigms and OOPs Advantages Abstraction and Encapsulation Polymorphism Inheritance Function Overloading Concepts Function Overloading Varieties Function Overloading Special Cases Defining Classes Creating and Using Class Objects Class Members Accessibility Class Function Types Inline Functions Constant Functions Nesting of Functions Class Members Scope Resolution Static Members in a Class Array of Objects Constructor Concepts Default Constructor Parameterized Constructor Copy Constructor Constructor Overloading Destructors Inheritance Fundamentals Public Derivations Private and Protected Derivations Multiple Inheritance Mult-Level Inheritance Class Nesting Data File Concepts Handling Text Files Handling Binary Files Pointer Concepts Pointer and Arrays Pointers and Functions Object Pointers This Pointer Linked Lists Stacks Queues


Back