PPt. on An _Array in C

Array ….?
Need of an Array.
 Classification of an Array.
Declaration.
Access Array Elements.
 Initialize an Array.

 An array is a data structure, which can store
a fixed-size collection of elements of the
same data type.
 All these elements are stored in consecutive
memory locations.
 May be of type int,float,char ,double and so
on….
 The size should be an individual constant.
 C arrays are always indexed from 0.

* We can use normal variables (v1, v2, v3, ..)
when we have a small number of objects, but
if we want to store a large number of
instances, it becomes difficult to manage
them with normal variables. The idea of an
array is to represent many instances in one
variable.
* We will learn the need of an array with the
program . Program is at 9th and 10th slide.

 Single / One Dimensional Array (1-D Array):-
 Multi Dimensional Array:-
# Single Dimensional Array #
single dimensional arrays are used to store a row of
values. In single dimensional array, data is stored in
linear form. Single dimensional arrays are also called
as One-dimensional Arrays, Linear Arrays or simply
1-D Arrays.

 Datatype arrayName[arraySize];
 For example:-
Here, we declared an array, , of
floating-point type. And its size is 5.
Meaning, it can hold 5 floating-point values.
 It's important to note that the size and type
of an array cannot be changed once it is
declared.
float mark[5];
mark

 You can access elements of an array by
indices.
 Suppose you declared an array as
above. The first element is , the
second element is and so on.
mark
mark[0]
mark[1]

Few Keynotes:-
• Arrays have 0 as the first index, not 1. In this
example, is the first element.
• If the size of an array is , to access the last
element, the index is used. In this example,
• Suppose the starting addressing of is 2530d.
Then, the address of the will be 2534d.
Similarly, the address of will be 2538d. And
so on ….. This is because the size of a float is 4 bytes.
mark[0]
n
n-1 mark[4]
mark[0]
Mark[1]
Mark[2]

 It is possible to initialize an array during declaration.
For example,
 You can also initialize an array like this.
 Here, we haven't specified the size. However, the
compiler knows its size is 5 as we are initializing it
with 5 elements.
mark[0] mark[1] mark[2] mark[3] mark[4]
Here,
int mark[5] = {5, 17, 22, 15, 8};
int mark[] = {5, 17, 22, 15, 8};
5 17 22 15 8
mark[0] is equal to: 5

Que:- Program to take 5 values from the user and store
them. And print the stored element. Without using array.
#include <stdio.h>
int main()
{
int a,b,c,d,e;
scanf("%d",&a);
scanf("%d",&b);
scanf("%d",&c
scanf("%d",&d);
scanf("%d",&e);
printf("%dn",a);
printf("%dn",b);
printf("%dn",c);
printf("%dn",d);
printf("%dn",e);
return 0;
}
Output
1
8
34
0
3
1
8
34
0
3

Que:- Program to take 5 values from the user and store
them in an array. And print the stored element.
#include <stdio.h>
int main() {
int values[5];
printf("Enter 5 integers: ");
// taking input and storing it in an array
for(int i = 0; i < 5; ++i) {
scanf("%d", &values[i]);
}
printf("Displaying integers: ");
// printing elements of an array
for(int i = 0; i < 5; ++i) {
printf("%dn", values[i]);
}
return 0;
}
Output
Enter 5 integers: 1
8
34
0
3
Displaying integers: 1
8
34
0
3

PPt. on An _Array in C

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PPt. on An _Array in C