C Program to Reverse an Array

C program to reverse an array; Through this tutorial, we will learn how to reverse an array using for loop, while loop and pointer in c programs.

Programs to Reverse an Array in C

• C Program to Reverse an Array using For Loop
• C Program to Reverse an Array using While Loop
• C Program to Reverse an Array using Pointer

C Program to Reverse an Array using For Loop

#include<stdio.h>

int main()
{
   int a[100], b[100], i, j, Size;

   printf("\nPlease Enter the size of an array: ");
   scanf("%d",&Size);

   printf("\nPlease Enter array elements: ");

   //Inserting elements into the array
   for (i = 0; i < Size; i++)
   {
      scanf("%d", &a[i]);
   }

   for(i = Size-1, j = 0; i >= 0; i--, j++)
   {
      b[j] = a[i];
   }

   printf("\nResult of an Reverse array is: ");
   for (i = 0; i < Size; i++)
   {
      printf("%d \t", b[i]);
   }

   return 0;
}

The output of the above c program; as follows:

Please Enter the size of an array: 5
Please Enter array elements: 7 8 9 1 3
Result of an Reverse array is: 3 	1 	9 	8 	7 

C Program to Reverse an Array using While Loop

#include<stdio.h>

int main()
{
   int a[100], i, j, Size, Temp;

   printf("\nPlease Enter the size of an array: ");
   scanf("%d",&Size);

   printf("\nPlease Enter array elements: ");

   //Inserting elements into the array
   for (i = 0; i < Size; i++)
   {
      scanf("%d", &a[i]);
   }

   j = i - 1;   // Assigning j to Last array element
   i = 0;       // Assigning i to first array element

   while (i < j)
   {
      Temp = a[i];
      a[i] = a[j];
      a[j] = Temp;
      i++;
      j--;
   }

   printf("\nResult of an Reverse array is: ");
   for (i = 0; i < Size; i++)
   {
      printf("%d \t", a[i]);
   }

   return 0;
}

The output of the above c program; as follows:

Please Enter the size of an array: 5
Please Enter array elements: 1 2 3 4 5
Result of an Reverse array is: 5 	4 	3 	2 	1 	

C Program to Reverse an Array using Pointer

#include <stdio.h>


#include <stdlib.h>
int main()

{

	int *a,n,i,j,temp;

	printf("Enter size of array:");
	scanf("%d",&n);

	a=calloc(sizeof(int),n);
	printf("Enter %d Elements:",n);
	for(i=0;i<n;i++)

	{

		scanf("%d",a+i);

	}



	for(i=0,j=n-1;i<j;i++,j--)

	{

		temp=*(a+i);
		*(a+i)=*(a+j);
		*(a+j)=temp;
	}

	printf("After reversing the array:\n");
	for(i=0;i<n;i++)

	{

		printf("%d",*(a+i));

	}


	return 0;

}

The output of the above c program; as follows:

Enter size of array:5
Enter 5 Elements:1 2 3 4 5
After reversing the array:
54321

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