Array

Array is a variable that represents a collection of identical objects , that means we can store a group of variables of same data type and name together

Do you remember the strings , yes that was a character array , but now we will see integer array 

Each member of an array is referred by a index value starting with 0 and the last element of a array is an null character that is \0

The above figure shows a array of elements of size 20 , but remember that since the last position is occupied by a null character so the actual size of the array is 19 

As said we can have array of integers or array of characters also called strings

Syntax for array is

Data_type array_name [size of array];

We can accept values for every array element one by one but that is not how it is done , instead we use a loop (for loop ) to enter and to print the values of an array , but it is possible to do one by one if needed

main()

{

     

      int array[5];

      int i;

     

      for(i=0;i<5;i++)

      {

      printf("Enter number fo position %d \n",i+1);

      scanf("%d",&array[i]);

      }

    

      for(i=0;i<5;i++)

      {

       printf(" Array Element in %d is ..... %d\n",i+1,array[i]);

      }

     

      getch();

     

The above program accepts values for the array “int arrya” ,  loops it in a for loop that runs from 0 to 4 and in each time changes the index of the array “array[i]” to save the values at different positions and in the next for loop prints the array elements one by one

Multi dimensional Array

Sine now we were only seeing array that can store values like the compartments of a train each one having one value but now we will see multi dimensional array , think it of like a stack of train on one another

So multidimensional array looks like

Data_type array_name [column size] [row size];

So if we have an array of [2][20]

It will look like this

We can use these kind of array to form a grid but for now let us print time table from 1 to 10 using multi dimensional array and for loop

main()

{

     

        int i,j;

     

        int array[10][10];

     

        for(i=0;i<10;i++)

        {

        for(j=0;j<10;j++)

        {

         array[i][j] = (i+1)*(j+1);

        }                

        }

     

      for(i=0;i<10;i++)

        {

        for(j=0;j<10;j++)

        {

        printf("%3d ",array[i][j]);

        }

        printf("\n");

       }

     

     

      getch();

     

      }

This programs just display the times table from 1 to 20