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Arrays in C

What is an Array?

In C, an array is a data structure that stores a fixed-size sequential collection of elements of the same type. Each element in the array occupies a contiguous memory location, and they are accessed by their position, known as the index. Arrays are particularly useful when dealing with a collection of data elements of the same type that need to be stored and accessed efficiently.

Declaration :

Arrays are declared by specifying the data type of the elements they will hold and the number of elements. For example : declares an array of integers with 5 elements.
int numbers[5];

Initialization :

Arrays can be initialized at the time of declaration or later using braces {}. For example : initializes an array of integers with specific values.
int numbers[5] = {1, 2, 3, 4, 5};

Indexing :

Elements in an array are accessed using an index. Array indices start from 0 and go up to (size - 1). For example: numbers[0] accesses the first element, numbers[1] accesses the second element, and so on.

Example :

C Code

													
                                                      
#include <stdio.h>
int main() {
	int i;
    int numbers[5];

    numbers[0] = 10;
    numbers[1] = 20;
    numbers[2] = 30;
    numbers[3] = 40;
    numbers[4] = 50;
    
    printf("Array elements: ");
    for (i = 0; i < 5; i++) {
        printf("%d ", numbers[i]);
    }
}
                                                       

													
												

Output :
Array elements: 10 20 30 40 50

Explanation :
- We declare an array of integers named numbers with a size of 5.
- We initialize each element of the array with values 10, 20, 30, 40, and 50, respectively.
- We then print out all the elements of the array using a loop, iterating through each element and printing it.

problems & solutions :

C Code

													# Write a program to find the sum and average of the numbers of the given Single Dimensional array. int m[]= {25,38,49,50,70,59};
                                                      
#include<stdio.h>
main()
{
	int m[]= {25,38,49,50,70,59};
	int i,s=0;

	for(i=0;i<6;i++)
	{
		s=s+m[i];
	}
	printf("sum=%d\n",s);
	float avg;
	avg=(float)s/6;
	printf("average=%f",avg);
}
                                                       

													
												

Output :
sum=291
average=48.500000

C Code

													# Write a program to find the greatest number of the given Single Dimensional Array. int m[]={68,35,19,55,91,29};
                                                      
#include<stdio.h>
main()
{
	int m[]={68,35,19,55,91,29};
	int n,i,j;
	int max=m[0];
	for(i=0;i<6;i++)
	{
	if(m[i]>max)
	max=m[i];
	}
	printf("Max=%d",max);	
}
                                                       

													
												

Output :
Max=91

C Code

													# Write a program to reverse array elements.
                                                      
#include<stdio.h>
main()
{
	int n,i;
	printf("Enter a range=");
	scanf("%d",&n);
	int a[n],s[n];
	for(i=0; i<n; i++)
	{
		printf("Enter number=");
		scanf("%d",&a[i]);
	}
	int k=0;
	for(i=n-1; i>=0; i--)
	{
		s[k]=a[i];
		k++;
	}
	printf("After reverse=");
	for(i=0;i<n;i++)
	{
		printf("%d ",s[i]);
	}
}
                                                       

													
												

Output :
Enter a range=4
Enter number=1
Enter number=2
Enter number=3
Enter number=4
After reverse=4 3 2 1

Conclusion :

In Conclusion, arrays play a fundamental role in C programming by providing a mechanism for efficient data storage, manipulation, and access. Their importance lies in their ability to simplify programming tasks, improve memory management, and enhance code efficiency and readability.

Arrays in C

What is an Array?

Declaration :

Initialization :

Indexing :

Example :

problems & solutions :

Conclusion :

C All Chapters

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