การใช้ Turbo C ชุดที่ 11 function
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The document contains information about computer programming functions in three sections: 1. It defines a function and explains the basic components of a function like the function name, parameters, return type, and return statement. 2. It describes different ways a function can be called - by value, by reference, and passing an array by reference. It provides code examples to illustrate each case. 3. It discusses global and local variables, and variable modifiers like static and extern that change how variables can be accessed within and outside functions.
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type function-name(type arg-1,type arg-2,..., type arg-n)
{
variable-declaration;
statement-1;
statemetn-2;
...
statement-n;
return();
}
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![#include stdio.h
void Add( int *x);
main(void)
{
int a[3] = {0,1,2};
clrscr();
Add(a);
Add(a);
Add(a);
getch();
}
void Add( int *x)
{
int result;
result = x[0] + x[1] + x[2];
printf( %d + %d + %d = %dn, x[0], x[1], x[2], result);
x[0] = result;
return;
}
0 + 1 + 2 = 3
3 + 1 + 2 = 6
6 + 1 + 2 = 9](https://image.slidesharecdn.com/cpwk11function-150212104229-conversion-gate02/85/Turbo-C-11-function-11-320.jpg)
การใช้ Turbo C ชุดที่ 11 function
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- 7. R›:4™=dLJhwTh4eVVdM5–`TlXo5–eTe pXcTh4eV7jL5–`TlX4XdMsN ^JFFF` R›:4™=dLJhwsT•Th4eVVdM5–`TlXo5–eTe pXcsT•7jL5–`TlX4XdMsN #include stdio.h #include conio.h void About(void); Function Prototype main(void) { About(); } void About(void) { clrscr(); gotoxy(1,8); printf(t***********************************n); printf(t* Void Function, version 1.01 *n); printf(t* MS-DOS, PC-DOS *n); printf(t* *n); printf(t* This product licensed to : *n); printf(t* - *n); printf(t* Gumtorn Ruanfaigad *n); printf(t* - *n); printf(t* ............................... *n); printf(t* System resource : 75%% free *n); printf(t***********************************n); getch(); } *********************************** * Void Function, version 1.01 * * MS-DOS, PC-DOS * * * * This product licensed to : * * - * * Gumtorn Ruanfaigad * * - * * ............................... * * System resource : 75% free * ***********************************
- 8. -4- ^JFFF` DOOEYDOXH #include stdio.h void Add( int x, int y); main(void) { int a = 1, b = 2; clrscr(); Add(a,b); Add(3,4); getch(); } void Add( int x, int y) { int result; result = x + y; printf( %d + %d = %dn, x, y, result); return; } 1 + 2 = 3 3 + 4 = 7
- 9. -5- ^JFFF` DOOEUHIHUHQFH #include stdio.h void swap(int *ia , int *ib); void main() { int a,b; a = 123; b = 456; clrscr(); printf(a = %d , b = %dn,a,b); swap(a,b); printf(a = %d , b = %dn,a,b); } void swap(int *ia , int *ib) { int tmp; tmp = *ia; *ia = *ib; *ib = tmp; } a = 123 , b = 45 a = 456 , b = 12
- 11. #include stdio.h void Add( int *x); main(void) { int a[3] = {0,1,2}; clrscr(); Add(a); Add(a); Add(a); getch(); } void Add( int *x) { int result; result = x[0] + x[1] + x[2]; printf( %d + %d + %d = %dn, x[0], x[1], x[2], result); x[0] = result; return; } 0 + 1 + 2 = 3 3 + 1 + 2 = 6 6 + 1 + 2 = 9
- 12. -7- ^JFFF` R›:4™=dLJhwTh4eVVdM5–`TlXo5–eTe pXcTh4eV7jL5–`TlX4XdMsN #include stdio.h int Add( int x, int y); main(void) { int a = 1, b = 2; clrscr(); printf( a + b = %dn, Add( a, b)); printf( 3 + 4 = %dn, Add( 3, 4)); getch(); } int Add( int x, int y) { int result; result = x + y; return(result); } a + b = 3 3 + 4 = 7
- 13. -8- =LgG5`:HdZpNV;|epL4HeT5`Mo5H *OREDO9DLDEOHoNLHdZpNVJhw]eTeVI o5–eIi:;e4JhwrGurL qNVp4VT /RFDO9DULDEOHoNLHdZpNVJhwo5–eIi:sG–oQec SeUrLR›:4™=dL JhwNVc4e[/RFDOYDULDEOHLdxLsZ–oJ•eLdxL ^JFFF` #include stdio.h void Fcnt1(void); int x = 12; Global Variable int y = 56; main(void) { clrscr(); printf(Global x = %dn, x); Fcnt1(); Fcnt1(); } void Fcnt1(void) { int x = 33; Local Variable static int z = 78; Static Local Variable x = x + 1; printf(n); printf(:: Local x = %dn, x); printf(:: Global y = %dn, y); printf(:: Local z = %dn, z); z++; } Global x = 12 :: Local x = 34 :: Global y = 56 :: Local z = 78 :: Local x = 34 :: Global y = 56 :: Local z = 79
- 14. -9- 0RGLILHU 6WDWLFr=–]| /RFDOYDULDEOH JhwoTjw`]gxL]kG4eVJ| e:eL5`:R›:4™=dLLdxLpX–Z 7•e5`:HdZpNVUd: 7:`Ul•rL^L•ZU7ZeT;|e ([WHUQ]| SeUL`4 VRXUFHFRGHJhwH–`:4eVo5–eIi:HdZpNV ^Vj`R›:4™=dLLdxL ^JFFSUM`^JFFDF`^JFFEF` ^JFFSUM` gcc1006a gcc1006b ^JFFDF` extern int a; extern int b; extern int Add(int x, int y); main(void) { clrscr(); printf( %d + %d = %dn, a, b, Add(a,b)); } ^JFFEF` #include stdio.h int a = 123; int b = 456; int Add( int x, int y) { int result; result = x + y; return(result); } 123 + 456 = 5