Basic algebra formulas that you can revise anytime and anywhere

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FORMULAS FOR BEGINNER (a+b) ^2= a^2+b^2+2ab (a+b) ^2= (a-b) ^2+4ab (a-b) ^2= a^2+b^2-2ab (a-b) ^2= (a+b) ^2-4ab a^2+b^2= (a+b) ^2-2ab a^2+b^2= (a-b) ^2+ 2ab a^2-b^2= (a+b) (a-b) (a+b+c) ^2= a^2+b^2+c^2+2(ab+bc+ac) (a-b-c) ^2= a^2+b^2+c^2-2(ab-bc+ac) (a+b) ^3= a^3+b^3+3ab(a+b) (a-b) ^3= a^3-b^3+3ab(a-b) a^3+b^3= (a+b) (a^2-ab+b^2) a^3-b^3= (a-b) (a^2+ab+b^2) a^4-b^4= (a^2-b^2) (a^2+b^2) = (a^2+b^2) (a+b) (a-b) a^5+b^5= (a+b) (a^4-a^3b+a^2b^2-ab^3+b^4) a^5-b^5= (a-b) (a^4+a^3b+a^2b^2+ab^3+b^4)
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Preprocessor Directives

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Before a C program is compiled in a compiler, source code is processed by a program called preprocessor. This process is called preprocessing.

Commands used in preprocessor are called preprocessor directives and they begin with ''#'' symbol. Below is the list of preprocessor directives that C language offers.

1 Macro
syntax:
#define
This macro defines constant value and can be any of the basic data types.

2 Header file inclusion
syntax:
#include <file_name>
The source code of the file ''file_name'' is included in the main program at the specified place

3 Conditional compilation
syntax:
#ifdef, #endif, #if, #else, #ifndef
Set of commands are included or excluded in source program before compilation with respect to the condition

4 Other directives
syntax:
#undef, #pragma
#undef is used to undefine a defined macro variable.
#Pragma is used to call a function before and after main function in a C program

These are the Concept of C programming . We'll be glad if you share your valuable information with us regarding this topic, then it will be a golden opportunity for all of us to improve ourselves and know more. Comment below!!

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