1 Dimensional Array in C

January 18, 2023

1D Array

1D Array is defined as the continuous block of memory in which a similar data type is stored. 1D Array indexing starts with size 0 and ends with size -1. The size of the 1D array is fixed and it is stored in static memory.

Syntax:

  [arr_size]={value 1, value 2, value 3,…,value n-1};

Representation of 1D Array

Array Declaration

Declaration of 1D Array consists of any data type and it can be declared by any random name or any random variable.

Syntax:

int arr[10]; 

// Here int is the data type of array.
// arr is the name of array.
// 10 is the size of array.

2D Array

Multi-dimensional arrays

Passing array as a parameter

Strings in C

Array v/s string

Array Initialization

In 1D Array, All the elements consist of garbage value at initial time but it can be explicitly initialized during declaration.

Syntax:

  [arr_size]={value 1, value 2, value 3,…,value n-1};

Accessing of elements in 1D Array:

In 1D Array elements are accessed by putting the array name and index value inside square brackets.

Syntax:

<arr_name>[index];

Rules for 1D Array Declaration:

In 1D array we must have to declare the array variable.
1D Array stores the data in contiguous memory locations.
1D Array should be a list of similar data types.
The size of the 1D array should be fixed.
1D Array should be stored in static memory.
1D Array indexing starts with size 0 and ends with size -1.
In 1D Array declaration of array size within the bracket is not necessary.
In 1D Array it must include the variable name and data type while declaring any arrays .

Example 1

Run

#include <stdio.h>
int main() {
    int arr[5] = {1,3,5,7,9};
    printf("The elements of arrays are :");
    for(int i=0; i<5; i++){
    printf(" %d",arr[i]);
    }
    return 0;
}

Output:

The elements of arrays are : 1 3 5 7 9

Example 2

Run

#include <stdio.h>
int main() {
    int arr[12] = {1,3,5,7,9,10,12,14,23,22,33,35};
    printf("The even elements in arrays are :");
    for(int i=0; i<12; i++){
    if(arr[i]%2==0) printf(" %d",arr[i]);
}
return 0;
}

Output

The even elements in arrays are : 10 12 14 22

Example 3

Run

#include 
int main() {
    int arr[11] = {3,5,7,9,10,12,14,23,22,33,35};
    for(int i=0; i<11; i++){
        if(i==0){
            printf("First element of array : %d\n",arr[i]);
        }
        else if(i==4) {
            printf("Fifth element of array : %d\n", arr[i]);
        }
        else if(i==10){
            printf("Last element of the array : %d", arr[i]);
        }
    }
    return 0;
}

Output

First element of array : 3
Fifth element of array : 10
Last element of the array : 35

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2 comments on “1 Dimensional Array in C”

nilimasahu2201
Dear PrepInsta Team,
I appreciate your informative videos. Could you please provide notes with the same details as in the videos? This would enhance our learning experience and serve as a valuable reference. Thank you for considering this request

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PrepInsta Support
Hey Nilima! Thank you so much for your feedback. We will look into it.

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