Array and Pointer
Hi Everyone
So today we are going to discuss about the derived datatype in c programming language. We are going to discuss about the concept of array and pointer. So array is collection of data of similar datatype. Pointer is a variable which points to another variable means pointer is a variable which stores address of another variable. Here i would like to add additional topic which is pointer to pointer concept. In this concept pointer stores address of another pointer . So now all this concepts are used in memory manegement. Here I would like to share difference between * and & sign.
So in the concept of pointer we will use & sign to see the address of pointer and to assign address of variable to pointer. We will use * sign to print the data which is stored in pointer means the value of variable where pointer points will be printed. For example
#include<stdio.h>
main()
{
int a=10;
int *p;
*p=&a;
int **q=&p;
printf("%d\n",a);
printf("%d\n",&a);
printf("%d\n",*p);
printf("%d\n",&p);
printf("%d",**q);
}
/*Assume that address of a=1000 and p is 1004.
*/
OUTPUT:
10
1000
10
1004
10
Here the value of &a and p are dependent of compiler becuase these are the memory address so I is dependent upon the compiler that which address compiler would assign to it. Let's see an example of array
#include<stdio.h>
main()
{
int a[10]={1,2,3,4,5,6,7,8,9,10};
printf("%d\n",a[0]);
printf("%d\n",a[1]);
printf("%d\n",a[2]);
printf("%d\n",a[3]);
printf("%d\n",a[4]);
printf("%d\n",a[5]);
printf("%d\n",a[6]);
printf("%d\n",a[7]);
printf("%d\n",a[8]);
printf("%d\n",a[9]);
return 0;
}
OUTPUT:
1
2
3
4
5
6
7
8
9
10
Here the address would be assigned like this assuming address of a is 1000 for 16bit machine size of integer is 2bytes.
a[0] address will be 1000
a[1] address will be 1002
a[2] address will be 1004
a[3] address will be 1006
a[4] address will be 1008
a[5] address will be 1010
a[6] address will be 1012
a[7] address will be 1014
a[8] address will be 1016
a[9] address will be 1018.
The array index always starts from 0.
Here we can use loop also but we haven't introduce the concept of loop so i have not written loop over here.Using this you can store collection fo f data of similar datatypes.
Thanks for watching this blog. Thanks to all of my viewers.
Made by Great Lord Shri Krishna
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