What is meant by pointer in c programming?

example programs

What is meant by pointer in c programming?
Pointer:


*********


Poiinter is a variable which contains the address of another variable's memory location. Pointer provides an indirect way of accessing the value stored in a variable





%26amp; - used to return the address of a variable





* - used to store a value at a particular address.








Example:


**********





main()


{


int i=3;


int *j;


j=%26amp;i; /*returns address of i %26amp; stored in integer pointer variable j


printf("\naddress of i=%u"%26amp;i);


printf("\naddress of i=%u",j);


printf("\naddress of j=%u",%26amp;i);


printf("\nvalue of j=%d",j);


printf("\nvalue of i=%d",i);


printf("\nvalue of i=%d",*(%26amp;i));


printf("\nvalue of i=%d,*j);


getch();


}





output


*******





address of i=6485


address of i=6485


address of j=3276


value of j=6485


value of j=3


value of i=3


value of i=3


**************************************...





hope this helps....
Reply:No end for doubts and todays programming challenges are much more complicated. Pointers are trivial stuff and don't bother about it.
Reply:A pointer is not a normal variable, it is a special type of variable which is used to store the address of a normal variable.It is used to increase the speed of the system.we can perform add,sub on pointer variables.
Reply:Pointer is a variable which points to some other variable...
Reply:Pointer is a special vatiable that holds the adress of another variable.


Its most used applications can be found in fuctions,dynamic memory allocation and files.





main()


{


int *p;


int a[5],i;


printf("Enter array");


for(i=0;i%26lt;5;i++)


{


scanf('%d",%26amp;a[1]);


}


p=a;


printf("Display elements using pointers \n");


for(i=0;i%26lt;5;i++)


{


printf("%d",a+i);


}/*hope this helps*/


}
Reply:http://vergil.chemistry.gatech.edu/resou...





http://www.imada.sdu.dk/~svalle/courses/...





http://www.lysator.liu.se/c/bwk-tutor.ht...





http://www.cs.cf.ac.uk/Dave/C/
Reply:try this





http://vergil.chemistry.gatech.edu/resou...
Reply:A pointer can be used to access a data object indirectly through memory address.





· The content stored in a pointer variable is the address of another variable.





· The pointer is said to point to a variable if it contains the address of the variable.





· Pointers are stored in 4 bytes of memory. (2 bytes for older machines)





Pointers are declared using an asterisk * , as follows:


eg: Pointer declaration for INTEGER : int *px;


eg: Pointer declaration for FLOAT : float *px;





( Special: A pointer variable declared with type void can point to any type of data object)


void *px;





Simple example, you will understand by studying the addresses:





void main(void)


{


int x, y;


int *px; //pointer variable





printf("The address of the variable x (%26amp;x) is %lu\n", %26amp;x);


px = %26amp;x; //assign the address of x to px, i.e. px points to x


printf("The value(address) stored in the pointer variable px is %lu\n\n",


px); //Same as %26amp;x


printf("The address of the variable y (%26amp;y) is %lu\n", %26amp;y);


px = %26amp;y; //assign the address of y to px, i.e. px points to y


printf("The value(address) stored in the pointer variable px is %lu\n",


px); //Same as %26amp;y


} //main
Reply:it keeps the address of a variable.