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Thursday, May 1, 2014

Array in C

 C Array is a collection of variables belongings to the same data type. You can store group of data of same data type in an array.

  • Array might be belonging to any of the data types
  • Array size must be a constant value.
  • Always, Contiguous (adjacent) memory locations are used to store array elements in memory.
  • It is a best practice to initialize an array to zero or null while declaring, if we don’t assign any values to array.

    Example for C Arrays:

    • int a[10];       // integer array
    • char b[10];   // character array   i.e. string
    Types of C arrays:
    There are 2 types of C arrays. They are:

    1. One dimensional array
    2. Multi dimensional array
    • Two dimensional array
    • Three dimensional array, four dimensional array etc…
      1. One dimensional array in C:
      • Syntax : data-type arr_name[array_size];

        Example program for one dimensional array in C:
        #include<stdio.h>
        int main()
        {
            int i;
            int arr[5] = {10,20,30,40,50};  
            // declaring and Initializing array in C
            //To initialize all array elements to 0, use int arr[5]={0};

            /* Above array can be initialized as below also
               arr[0] = 10;
               arr[1] = 20;
               arr[2] = 30;
               arr[3] = 40;
               arr[4] = 50;
            */

            for (i=0;i
            {
                // Accessing each variable
                printf("value of arr[%d] is %d \n", i, arr[i]);
            }
        }

        Output:
        value of arr[0] is 10
        value of arr[1] is 20
        value of arr[2] is 30
        value of arr[3] is 40
        value of arr[4] is 50


        2. Two dimensional array in C: 

        •  Two dimensional array is nothing but array of array.
        • syntax : data_type array_name[num_of_rows][num_of_column]


          Example program for two dimensional array in C:
          #include<stdio.h>
          int main()
          {
              int i,j;
              // declaring and Initializing array
              int arr[2][2] = {10,20,30,40};
              /* Above array can be initialized as below also
                 arr[0][0] = 10;   // Initializing array
                 arr[0][1] = 20;
                 arr[1][0] = 30;
                 arr[1][1] = 40;
              */

              for (i=0;i
              {
                 for (j=0;j
                 {
                    // Accessing variables
                    printf("value of arr[%d] [%d] : %d\n",i,j,arr[i][j]);
                 }
              }
          }

          Output:
          value of arr[0] [0] is 10
          value of arr[0] [1] is 20
          value of arr[1] [0] is 30
          value of arr[1] [1] is 40

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