Array in C Language

Hello friends how are you, today in this blog i will teach you what is Array, syntax of Array, how Array works and many programs of Array in a very simple way.

Let's start

1.It is a collection of data of same data type.
2.It is used to store group of data simultaneously.
3.It can store data of same data type means an integer array can store only integer value ,character array can store only character value and so on.
4.We can not fetch data from array directly therefore we use index point.
5.The indexing of array always start with 0.
6.Index value is always an integer number.
7.Array may be of any data type like int, char, float etc.

👉Syntax

1.Here a is the name of array.

2.int is the data type of array.

3.Size of array is 5 means we can store maximum 5 values in this array.

👉Initialization of array method 1

int a[5]={ 45,23,89,12,78 };

👉Initialization of array method 2

int a[5];
a[0]=45;
a[1]=23;
a[2]=89;
a[3]=12;
a[4]=78;

👉Printing of array element method 1

#include<stdio.h>
int main()
{
int a[5]={ 45,23,89,12,78 };
printf("value at a[0]=%d\n",a[0]);
printf("value at a[1]=%d\n",a[1]);
printf("value at a[2]=%d\n",a[2]);
printf("value at a[3]=%d\n",a[3]);
printf("value at a[4]=%d\n",a[4]);
}

### Output ###
value at a[0]=45
value at a[1]=23
value at a[2]=89
value at a[3]=12
value at a[4]=78

Here in the above program if the array elements increases then number of printf statement will also increase. Here we are using only 5 array elements so you will find that it is very simple to print all elements of array but this method of printing array elements is very time consuming and  is for beginners, if you want to print all array elements using very few line then go for second method which is below. 

👉Printing of array element method 2

Here i am going to use for loop to print all the elements of  array and this is the best method to access all the elements of array. Here in this case if the array elements increases then only we have to increase loop count and remain code will be same.

#include<stdio.h>
int main()
{
int a[5]={ 45,23,89,12,78 };
for(int i=0;i<=4;i++)
{
printf("value at a[%d]=%d\n",i,a[i]);
}
}
/*
### Output ###
value at a[0]=45
value at a[1]=23
value at a[2]=89
value at a[3]=12
value at a[4]=78
*/

👉User input in array

This method of taking user input in array is very time consuming but if you are beginner then you can use it otherwise go for user input using loop which is discussed after this topic.

#include<stdio.h>
int main()
{
int a[3];//declaring array
printf("Enter element 1=");
scanf("%d",&a[0]);//taking input at index 0
printf("Enter element 2=");
scanf("%d",&a[1]);//taking input at index 1
printf("Enter element 3=");
scanf("%d",&a[2]);//taking input at index 2
for(int i=0;i<=2;i++)
{
printf("value at a[%d]=%d\n",i,a[i]);
}
}
/*
### Output ###
Enter element 1=12
Enter element 2=45
Enter element 3=17
value at a[0]=12
value at a[1]=45
value at a[2]=17
*/

👉User input using loop

To assign elements in array by taking user input is also very simple in array because using loop we can simply store many elements in array using very few line of code.

#include<stdio.h>
int main()
{
int a[3];//declaring array
for(int j=0;j<=2;j++)
{
printf("Enter element %d=",(j+1));
scanf("%d",&a[j]);//taking user input
}
for(int i=0;i<=2;i++)
{
printf("value at a[%d]=%d\n",i,a[i]);
}
}
/*
### Output ###
Enter element 1=12
Enter element 2=45
Enter element 3=17
value at a[0]=12
value at a[1]=45
value at a[2]=17
*/

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