Function C
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This chapter discusses functions in C programming. It covers binary/standard functions that come with C libraries and are declared in header files. User-defined functions can be created by the programmer. The format for declaring a function includes its return type, name, parameters, and code block. Functions can be void, with a return value, or take arguments. Variables used in a function have either local or global scope.
Function C
- 1. Chapter 4 Function Mr.Warawut Khangkhan Twitter: http://twitter.com/awarawut Facebook: http://www.facebook.com/AjWarawut E-Mail: awarawut@hotmail.com Mobile: 083-0698-410
- 2. Contents Binary function or Standard function. User defined function. Format function declaration. Type of functions. The score of variables. Mr.Warawut Khangkhan Chapter 4 Function 2
- 3. FUNCTION Mr.Warawut Khangkhan Chapter 4 Function 3
- 4. Function F F F main( ) F F F F C F F2 F (Library Function) F F F F F F F (User Defined Function) Mr.Warawut Khangkhan Chapter 4 Function 4
- 5. BINARY FUNCTION OR STANDARD FUNCTION Mr.Warawut Khangkhan Chapter 4 Function 5
- 6. Binary function or Standard function F F F C F F F F F F ,F F F F F Mr.Warawut Khangkhan Chapter 4 Function 6
- 7. Binary function or Standard function (Cont.) F C F F .h F header file F F F header file F F F F F math.h F F F F string.h Mr.Warawut Khangkhan Chapter 4 Function 7
- 8. Binary function or Standard function (Cont.) F F F #include <header file> F F F C F F F F F header file F F F F F F F F Mr.Warawut Khangkhan Chapter 4 Function 8
- 9. Example lib_func.c #include <stdio.h> #include <math.h> int main( ) { int x, y; printf(“Enter number: “); scanf(“%d”, &x); y = sqrt(x); printf(“Square root of %d = %d”, x, y); system(“PAUSE”); return 0; } Mr.Warawut Khangkhan Chapter 4 Function 9
- 10. USER DEFINED FUNCTION Mr.Warawut Khangkhan Chapter 4 Function 10
- 11. F F (User defined function) F C F F F F F F F C F F F F F F F F F F F F F F F F F F Mr.Warawut Khangkhan Chapter 4 Function 11
- 12. User defined function (Cont.) (Cont.) F F F F F FF F F F F F Mr.Warawut Khangkhan Chapter 4 Function 12
- 13. FORMAT FUNCTION DECLARATION Mr.Warawut Khangkhan Chapter 4 Function 13
- 14. F C (Format function declaration) type function-name ( type arg-1, type arg-2, … ) { local variable declaration; statement-1; statement-2; statement-3; … statement-n; return ( value ); } Mr.Warawut Khangkhan Chapter 4 Function 14
- 15. Example ex_func.c #include <stdio.h> void main( ) { line( ); void line( ) { int i; printf(“Welcome to for (i=0; i<30; i++) C Programmingn”); printf(“*”); line( ); printf(“n”); } } Mr.Warawut Khangkhan Chapter 4 Function 15
- 16. TYPE OF FUNCTIONS Mr.Warawut Khangkhan Chapter 4 Function 16
- 17. F (Type of functions) F F F3 F F / F F F F F F F F F F Mr.Warawut Khangkhan Chapter 4 Function 17
- 18. F F / F F F F F F F F F F (Argument) F F F F F F F F F F F FF F F F F F Mr.Warawut Khangkhan Chapter 4 Function 18
- 19. F F F F F F F F F (Argument) F F F F F F F F F F F F F F F3 int, float int F F F F F F F F F F F F int, float int Mr.Warawut Khangkhan Chapter 4 Function 19
- 20. F F F F F F F F F F F F F F F F F F F F F F F F F F F F Mr.Warawut Khangkhan Chapter 4 Function 20
- 21. F F F F (Cont.) variable = function-name ( arg-1, arg-2, … ); F F F F F F return F F F Mr.Warawut Khangkhan Chapter 4 Function 21
- 22. THE SCORE OF VARIABLES Mr.Warawut Khangkhan Chapter 4 Function 22
- 23. (The score of variables) C F F F F 2 ◦ global ◦ local Mr.Warawut Khangkhan Chapter 4 Function 23
- 24. global global F F external F F F F global F F F F F F F F F F F F F F Mr.Warawut Khangkhan Chapter 4 Function 24
- 25. global (Cont.) F global F F global F F Mr.Warawut Khangkhan Chapter 4 Function 25
- 26. local local F F automatic F F F local F F F F F F F F F F F F local F F F F F F F F F local F F Mr.Warawut Khangkhan Chapter 4 Function 26