C – Arrays Basic Programs – Ameerpet Technologies

Length of array:

sizeof() function returns the total size of array.
We can find the length of array by dividing total size with single element size.

int main()
{
            float arr[5];
            printf(“Total size of array : %d \n”, sizeof(arr));
            printf(“Array element size : %d \n”, sizeof(arr[0]));
            printf(“Length of Array : %d \n”, sizeof(arr)/sizeof(arr[0]));
return 0;
}

Note: Address of the first element is called the base address.
The address of the i^th element is given by the following formula,
Address_i = base_address + i*size_of_element

Array Initialization:

We can assign values directly in the declaration of array is called Initialization.
If we assign the elements less than the length of array, other locations get default values.

int main()
{
            int arr[5] = {10, 20, 30};
            int i;
            printf(“Array default values are : \n”);
            for(i=0 ; i<5 ; i++){
                        printf(“%d \n”, arr[i]);
            }
            return 0;
}

C Program to display First and Last element of Array:

int main ()
{
            int arr[] = {10, 20, 30, 40, 50};
            printf(“First element : %d \n”, arr[0]);
            printf(“Last element : %d \n”, arr[4]);
            return 0;
}

C Program to display last element using length:

int main ()
{
            int arr[] = {10, 20, 30, 40, 50};
            int len = sizeof(arr)/sizeof(int);
            printf(“Length : %d \n”, len);
            printf(“Last element : %d \n”, arr[len-1]);
            return 0;
}

C Program to Check First and Last elements Sum equals to 10 or not in Array:

int main ()
{
            int arr[] = {4, 3, 9, 2, 6};
            int first = arr[0];
            int last = arr[4];
            if(first+last==10)
                        printf(“Equals to 10 \n”);
            else
                        printf(“Not equals to 10 \n”);
            return 0;
}

C program to check the First element of Array is Even or Not:

int main ()
{
            int arr[] = {4, 3, 9, 2, 6};
            if(arr[0]%2==0)
                        printf(“First element is Even \n”);
            else
                        printf(“First element is not Even \n”);
            return 0;
}

C Program to replace the First and Last elements of array with 10:

int main ()
{
            int arr[] = {4, 3, 9, 2, 6}, i;
            arr[0] = 10;
            arr[4] = 10;
            printf(“Array elements are : \n”);
            for(i=0 ; i<5 ; i++){
                        printf(“%d \n”, arr[i]);
            }
            return 0;
}

C Program to Increase First and Decrease Last elements of Array:

int main ()
{
            int arr[] = {4, 3, 9, 2, 6};
            int i;
            arr[0]++;
            arr[4]–;
            printf(“Array elements are : \n”);
            for(i=0 ; i<5 ; i++){
                        printf(“%d \n”, arr[i]);
            }
            return 0;
}

C program to swap first and last elements of array:

int main ()
{
            int arr[] = {4, 3, 9, 2, 6};
            int i, temp;
            temp = arr[0];
            arr[0] = arr[4];
            arr[4] = temp;
            printf(“Array elements are : \n”);
            for(i=0 ; i<5 ; i++){
                        printf(“%d \n”, arr[i]);
            }
            return 0;
}

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