C Program to Reverse Elements of an Array
Reverse elements of an array in C
Here, in this page we will discuss the program to reverse elements of an array in C programming language. We are given with an array and need to reverse the elements. We will discuss various algorithms to reverse the array in efficient way.
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Here, in page we will discuss various method for reversing the array. Different methods are :
Method Discussed
- Method 1: Just print the array in reverse order
- Method 2: Actual in-place reversing of the original array
- Method 3: Recursive in-place reversing of the original array
Example :
- Input : arr[5] = [10, 20, 30, 40, 50]
- Output : Array after reversing, arr[5] = [50, 40, 30, 20, 10]
We will discuss all of these methods one by one below –
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Method 1
For an array: arr
- Run an iterative loop from the last index of the array
- Print each item one by one arr[i]
Let’s see how it works below –
Method 1 Code in C
Run
#include <stdio.h> void printReverse(int arr[], int len){ for(int i = len - 1; i >= 0; i--) printf("%d ", arr[i]); } int main() { int arr[] = {10, 20, 30, 40, 50, 60}; int len = sizeof(arr)/sizeof(arr[0]); printf("Array in Reverse:\n"); printReverse(arr, len); return 0; }
Output
Array in Reverse:
60 50 40 30 20 10
Method 2
For an array: arr[] with length len.
- Call a function void reverse(int arr[], int start, int end)
- Intial calling as reverse(arr, 0, len-1);
- Swap items at start & end indexes
- Do start++ & end–
- Stop when start & end indexes overlap one another
- Print the array
Time and Space Complexity :
- Time – Complexity : O(n)
- Space-Complexity : O(1)
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Method 2 Code in C
Run
#include <stdio.h> void reverse(int arr[], int start, int end) { while (start < end) { // swap arr[start] & arr[end] int temp = arr[start]; arr[start] = arr[end]; arr[end] = temp; start++; end--; } } void display(int arr[], int len){ for(int i = 0; i < len; i++) printf("%d ", arr[i]); } int main() { int arr[] = {10, 20, 30, 40, 50, 60}; int len = sizeof(arr)/sizeof(arr[0]); reverse(arr, 0, len-1); printf("Array in Reverse:\n"); display(arr, len); return 0; }
Output
Array in Reverse:
60 50 40 30 20 10
Method 3
In this method, we will use recursion. Call function reverseRecursive(int arr[], int start, int end)
Initially pass values of start = 0, end = len – 1
- Function gets called as reverseRecursive(arr, 0, len-1);
- In each recursive iteration swap arr[start] & arr[end]
- Make further recursive calls as reverseRecursive(arr, start + 1, end – 1);
- return when (start >= end)
- Print the array
Time and Space Complexity :
- Time – Complexity : O(n)
- Space-Complexity : O(n), require stack to store the recursive calls.
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Method 3 Code in C
Run
#include <stdio.h> void reverseRecursive(int arr[], int start, int end) { if (start >= end) return; int temp = arr[start]; arr[start] = arr[end]; arr[end] = temp; // recursive call to swap arr[start+1] & arr[end-1] reverseRecursive(arr, start + 1, end - 1); } void display(int arr[], int len){ for(int i = 0; i < len; i++) printf("%d ", arr[i]); } int main() { int arr[] = {10, 20, 30, 40, 50, 60}; int len = sizeof(arr)/sizeof(arr[0]); reverseRecursive(arr, 0, len-1); printf("Array in Reverse:\n"); display(arr, len); return 0; }
Output
Array in Reverse:
60 50 40 30 20 10
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#include
int main()
{
int a[10]={1,2,3,4,5,6,7,8,9,10};
int b[10];
int i,j,temp;
for(i=0,j=9;i<j;j–,i++){
temp=a[j];
a[j]=a[i];
a[i]=temp;
}
for(i=0;i<10;i++){
printf("%d",a[i]);
}
}
#include
int main(){
int a[5]={1,2,3,4,5};
for (int i = 4; i >= 0; i–)
{
printf(“%d “,a[i]);
}
return 0;
}
#include
int main()
{
int n,a[100],i;
printf(“enter the sie:”);
scanf(“%d”,&n);
printf(“enter the elements: “);
for(i=0;i=0;i–)
{
printf(“%d “,a[i]);
}
return 0;
}
#include
int main()
{
int n,a[100],i;
printf(“enter the size:”);
scanf(“%d”,&n);
printf(“enter the elements: “);
for(i=0;i=0;i–)
{
printf(“%d “,a[i]);
}
return 0;