Array

An array is a collection of data values ​​of the same type in a certain order that uses the same name.

According to its dimensions, arrays can be divided into:

1. One dimensional array

o Each array element can be accessed through an index

o The index array by default starts at 0

o Array declaration:

array_name [size]

Example

// Program to find the average of x (x < 10) numbers using arrays

#include <stdio.h>
int main()
{
     int marks[10], i, x, sum = 0, average;
     printf("Enter number: ");
     scanf("%d",&x);
     for(i=1; i<=x; ++i)
     {
          printf("Enter marks: " );
          scanf("%d",&marks[i]);
          sum += marks[i];
     }
     average = sum/x;

     printf("Average = %d",average);
     getchar();

     return 0;
}

2. An array of two dimensions

- A two-dimensional array is an array consisting of n rows and n columns. The form can be a matrix or table.

- array declaration:

array_name [row][column]

Example

#include <stdio.h>

int main() {
    int x[2][3] = {{1, 2, 3}, {4, 5, 6}}; // initialize data
    int i, j;
    
    for (i=0; i<2; i++) { // first for
        for (j=0; j<3; j++) { // second for
            printf("%d ", x[i][j]); // print array
        }
        printf("\n");
    }
    return 0;   
}

3. Multidimensional arrays

- Multidimensional arrays are arrays that have more than two sizes. The form of multidimensional array declaration is tantamount to declarations of one and two dimensional arrays.

- array declaration:

array_name [size1][size2]...[sizeN]