.reverse() code example

Example 1: reverse

// Iterative C++ program to reverse an array
#include <bits/stdc++.h>
using namespace std;

/* Function to reverse arr[] from start to end*/
void rvereseArray(int arr[], int start, int end)
{
	while (start < end)
	{
		int temp = arr[start];
		arr[start] = arr[end];
		arr[end] = temp;
		start++;
		end--;
	}
}	

/* Utility function to print an array */
void printArray(int arr[], int size)
{
for (int i = 0; i < size; i++)
cout << arr[i] << " ";

cout << endl;
}

/* Driver function to test above functions */
int main()
{
	int arr[] = {1, 2, 3, 4, 5, 6};
	
	int n = sizeof(arr) / sizeof(arr[0]);

	// To print original array
	printArray(arr, n);
	
	// Function calling
	rvereseArray(arr, 0, n-1);
	
	cout << "Reversed array is" << endl;
	
	// To print the Reversed array
	printArray(arr, n);
	
	return 0;
}

Example 2: reverse

#include<stdio.h>
#include<ctype.h> // to use system defined function islower & toupper

int main()
{
    printf("\n\n\t\tStudytonight - Best place to learn\n\n\n");

    char alphabet;
    printf("Enter an alphabet : ");
    putchar('\n');  // to move to next Line

    alphabet=getchar();

    printf("\n\nReverse case of %c is :  ",alphabet);

    if(islower(alphabet))
        putchar(toupper(alphabet));

    else 
        // must be an uppercase character
        printf("%c",tolower(alphabet)) ;

    printf("\n\n\t\t\tCoding is Fun !\n\n\n");
    return 0;
}