In this tutorial, we will learn C Program to Reverse an Array element. Before continuing, you should have knowledge of the following topics in C programming.
Revering an array element: The entered array of integers will be reversed and displayed. Example:
Input:
arr = {1, 2, 3, 4, 5, 6}
Output:
Reversed arr: {6, 5, 4, 3, 2, 1}
Here, we will look at two different programs to Reverse an Array element in C.
- By standard method
- By creating a function and swapping.
C Program to print the elements of an array in reverse order
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | #include <stdio.h> int main() { //Initialize array int arr[50], size, i; printf("Enter the size for an array: "); scanf("%d", &size); printf("Enter %d elements of an array:\n", size); for (i = 0; i < size; i++) scanf("%d", &arr[i]); printf("Original order of an Array:\n"); for (i = 0; i < size; i++) { printf("%d ", arr[i]); } printf("\nReversed order of an array:\n"); for (i = size - 1; i >= 0; i--) { printf("%d ", arr[i]); } return 0; } |
Output:
Enter the size for an array: 5
Enter 5 elements of an array:
10
20
30
40
50
Original order of an Array:
10 20 30 40 50
Reversed order of an array:
50 40 30 20 10
C Program to to Reverse the Array Elements using Function
This program has a separate function(rev_Array()) to reverse the element in an array. The reversing of elements is done by swapping array elements.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 | #include <stdio.h> void rev_Array(int arr[], int size) { int temp, i = 0; //swapping while (i < size) { temp = arr[i]; arr[i] = arr[size]; arr[size] = temp; i++; size--; } } int main() { //Variables int arr[50], size, i; //user inputs printf("Enter the size for an array: "); scanf("%d", &size); printf("Enter %d elements of an array:\n", size); for (i = 0; i < size; i++) scanf("%d", &arr[i]); printf("Original order of an Array:\n"); for (i = 0; i < size; i++) printf("%d ", arr[i]); //calling reverse function rev_Array(arr, size - 1); //printing the reversed order printf("\nReversed order of an Array:\n"); for (i = 0; i < size; i++) printf("%d ", arr[i]); return 0; } |
Output:
Enter the size for an array: 5
Enter 5 elements of an array:
20
30
40
60
80
Original order of an Array:
20 30 40 60 80
Reversed order of an Array:
80 60 40 30 20