Function in c language(defination and declaration)

Function in c language(defination and declaration)

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  Function in Clanguage (Defination and Declaration) Guided By Submitted By Vikash Maurya
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   What isC language ? Developed in1971. It is case sensible language. It helps to communicate with computer. It is High Level Programming Language. DENNIS RITCHIE
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  Example: #include<stdio.h> #include<conio.h> Void main() Keyword(main function) { int a , b; Identifier clrscr(); a=1; Constant b=2; sum= a+b; Operator Printf(“sum=%d”,sum); String getch(); } Special Symbol
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  It is aset of block which perform specific tasks. OR The subprogram is called as a function. A “C” program is a collection of one or more function. “C” program contains at least one function which is main().
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  Types of Function Userdefine functionLibrary function No Return Type Argument List Return Type Sub programs that is already defined in C language. Syntax to call a function: function name(); Ex;- scanf(); printf(); clrscr(); memcpy(); strcat(); Such functions created by users
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  Steps for UserDefine Function  Declaration of function.  Defination of function.  Call function.
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  DECLARATION OF FUNCTION: ReturnType Function Name Argument List void int float char User define name Ex:- Add int a, int b Etc…
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  Defination of function: ReturnType Function Name Argument List { statement; statement; . . . . . . . . . . . . . . }
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  Call function: Function name();
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  How user-define functionworks #include<stdio.h> Void functionname() { . . . . . . . . . . . . . . . . } int main() { . . . . . . . . . . . . . . . . functionname(); . . . . . . . . . . . . . . . . }
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  Output
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  Advantages of function: Program can be divided into a smaller, simple task.  Allowing the code to be called many times.  Easier error handling.  Easier to read and update.  Code reusability.
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  CONCLUSION:  To avoidrepetition of code and bulky programs functionally related statements are isolated into a function.  Function definition defines the body of the function.  Function declaration specifies the return type of the function and the types of parameters it accepts.  It is very easy to perform by the given steps.  It is used by one or more times.
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  THANK YOU