การใช้ Turbo C ชุดที่ 10 Pointer
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The document provides an introduction to computer programming pointers in 3 sections. Section 1 defines pointers and their uses to reference memory locations. Section 2 demonstrates how to use pointers to reference and modify variable values. Section 3 shows pointers being used to swap the values of two variables by passing their addresses to a function. The document concludes by thanking the reader.
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#define SIZE 16
#include stdio.h
char a[SIZE] = Hello World.;
char *ia;
int x;
void main()
{
clrscr();
printf(%sn , a);
ia = a;
printf(%sn , ia);
ia[6] = 'w';
printf(%sn , ia);
*(ia+8) = 'R';
printf(%sn , ia);
printf(%c%c%cn , ia[6] , ia[7] , ia[8]);
for(x = 0; ia[x] != 0; x++)
{
printf(%c , ia[strlen(a) - x - 1]);
delay(65535);
delay(65535);
}
printf(nName = );
scanf(%s,ia);
printf(Hello %s,ia);
getch();
}
Hello World.
Hello World.
Hello world.
Hello woRld.
woR
.dlRow olleH
Name = abcd
Hello abcd](https://image.slidesharecdn.com/cpwk10pointer-150212104215-conversion-gate02/85/Turbo-C-10-Pointer-6-320.jpg)
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#include stdio.h
#include conio.h
char *ia[2];
char a[16] = Chiangmai;
char b[16] = Thailand;
int x;
void main()
{
clrscr();
printf(%s %sn, a , b);
ia[0] = a;
ia[1] = b;
printf(%s %sn, ia[1] , ia[0]);
textcolor(LIGHTGREEN);
printf(%s %sn, ia[0] , ia[1] + 4);
getch();
}
Chiangmai Thailand
Thailand Chiangmai
Chiangmai land](https://image.slidesharecdn.com/cpwk10pointer-150212104215-conversion-gate02/85/Turbo-C-10-Pointer-7-320.jpg)
การใช้ Turbo C ชุดที่ 10 Pointer
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- 4. -3- Q`UL™oH`V™4dMHdZpNV ^JFFF` int x,*ix; void main() { clrscr(); x = 123; printf(x = %dn,x); ix = x; /* ix point to x variable */ printf(ix = %pn,ix); /* ix value */ printf(x = %dn,*ix); *ix = *ix + 1; (*ix)++; printf(x = %dn,x); } x = 123 ix = 045 x = 123 x = 125
- 5. -4- Q`UL™oH`V™4dMR›:4™=dL ^JFFF` #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
- 6. -5- Q`UL™oH`V™4dM`eV™oVU™ ^JFFF` #define SIZE 16 #include stdio.h char a[SIZE] = Hello World.; char *ia; int x; void main() { clrscr(); printf(%sn , a); ia = a; printf(%sn , ia); ia[6] = 'w'; printf(%sn , ia); *(ia+8) = 'R'; printf(%sn , ia); printf(%c%c%cn , ia[6] , ia[7] , ia[8]); for(x = 0; ia[x] != 0; x++) { printf(%c , ia[strlen(a) - x - 1]); delay(65535); delay(65535); } printf(nName = ); scanf(%s,ia); printf(Hello %s,ia); getch(); } Hello World. Hello World. Hello world. Hello woRld. woR .dlRow olleH Name = abcd Hello abcd
- 7. -6- `eV™oVU™5`:Q`UL™oH`V™ ^JFFF` #include stdio.h #include conio.h char *ia[2]; char a[16] = Chiangmai; char b[16] = Thailand; int x; void main() { clrscr(); printf(%s %sn, a , b); ia[0] = a; ia[1] = b; printf(%s %sn, ia[1] , ia[0]); textcolor(LIGHTGREEN); printf(%s %sn, ia[0] , ia[1] + 4); getch(); } Chiangmai Thailand Thailand Chiangmai Chiangmai land
- 8. -7- Q`UL™oH`V™5`:Q`UL™oH`V™ ^JFFF` #include stdio.h void main() { int **p1; int *p2, x; clrscr(); x = 123; printf(x = %dn , x); p2 = x; p1 = p2; **p1 = *p2 + 2; printf(x = %dn, **p1); getch(); } x = 123 x = 125