Interested to Buy Any Domain ? << Click Here >> for more details...
what is difference between array,strutter,union and pointers
- 3 Answers
- 32551 Views
- CTS, Lovely Professional University, Mannar Company, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / shashidhar
array can contain single data type
Structure is collection of different data types
Unions can also contain different data types, but here the
different date types share the same memory within the
computers memory
ex:
==========================
|| ||
==========================
in the above the memory between || || is shared by int,
float, double declarations in a UNION.
where as in struture || || || the memory
declared for int and float and double are different.
which implies memory utilization is better in union.
When you come to pointers, well it can point to a data type
(like int) can point to a structure (struct xyz{ };) , it
can point to a union (union item { }; ) so its like a honey
BEE it can sit on anything
| Is This Answer Correct ? | 54 Yes | 9 No |
Answer / ravi
structure is collection of different data types.
union is same as the structures, the only difference is in
memory allocation.
struct
{
int a;
float b;
};
struct s;
s.a=10;
s.b=3.0;
printf("%d%f",s.a,s.b);
For the above structure it allocates 2bytes for integer
variable and 4 bytes for flaot variable. so totally it
allocates 6bytes of memory to that structure. we can print
the s.a and s.b values as 10 and 3.0
#include<stdio.h>
union
{
int a;
char ch;
}u;
u.a=100;
u.ch='a';
printf("%d\n%d",u.a,u.ch);
But incase of union, the memory allocated is maximum
memory required among the variables. so only 4 bytes is
allocated to unions.
if u try to print the u.a, u.ch values it prints 97, 97
where the value of u.a is being assigned by u.ch . so we
cannt get value of u.a at last. It wont happen incase of
structures. so mostly we use structures in programming.
| Is This Answer Correct ? | 31 Yes | 6 No |
int i[2], j; int *pi;i[0] = 1; i[1] = 5; pi = i; j = *pi + 1 + *(pi + 1)Value of j after execution of the above statements will be a) 7 b) 6 c) 4 d) pointer
What are 3 types of structures?
Why doesn't C support function overloading?
What are the advantages and disadvantages of pointers?
how can i write a program that prints out a box such that whenever i press any key8(coordinate number) on the keyboard, the box moves.
What is the importance of c in your views?
If I want to initialize the array like. int a[5] = {0}; then it gives me all element 0. but if i give int a[5] = {5}; then 5 0 0 0 0 is ans. what will I do for all element 5 5 5 5 5 in a single statement???
Function to find the given number is a power of 2 or not?
What is the purpose of macro in C language?
Can you please explain the difference between exit() and _exit() function?
What is a keyword?
identify the in correct expression a.a=b=3=4; b.a=b=c=d=0; float a=int b=3.5; d.int a; float b; a=b=3.5;
C 
