Write a C Program To Reverse an Array Using Pointers

In this tutorial, we are going to see how to write a C program to reverse an array using pointers. For example, if ‘arr’ is an array of integers with three elements such as:

arr[0] = 1
arr[1] = 2
arr[2] = 3

Then, by reversing the array we will have:

arr[0] = 3
arr[1] = 2
arr[2] = 1

There are four ways to reverse an array in C, by using for loop, pointers, recursion, or by creating a function.
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Write a C Program To Reverse an Array Using Pointers

#include <stdlib.h>

int main(){
	int tmp,size,i,j,*arr;

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

	//allocates memory depending on size
	arr=calloc(sizeof(int),size);
	printf("Enter elements in array: ");
	for(i=0;i<size;i++)
		scanf("%d",arr+i);
		
	for(i=0,j=size-1;i<j;i++,j--){
		//swap the elements 
		tmp=*(arr+i);
		*(arr+i)=*(arr+j);
		*(arr+j)=tmp;
	}
	
	printf("After reversing the array: ");
	for(i=0;i<size;i++)
		printf("%d ",*(arr+i));
	
	return 0;
}

Output:

Enter size of array: 3  
Enter elements in array: 1 2 3
After reversing the array: 3 2 1

 
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