String

Reverse the String through character pointer.

#include<iostream>
#include<string.h>
using namespace std;

void reverse(char *ptr1)
{
    int length = strlen(ptr1);
    char *temp = new char[length];
    for(int i=length-1;i>=0;i--)
    {
        static int j =0;
        temp[j] = ptr1[i];
        j++;
    }
    cout<<temp<<endl;
}
int main()
{
    char *ptr = "Hello";
    reverse(ptr);
    return 0;
} 

Reverse the string through character array.

#include<iostream>
#include<string.h>
using namespace std;

void reverse(char ptr1[])
{
    int length = strlen(ptr1);
    char *temp = new char[length];
    for(int i=length-1;i>=0;i--)
    {
        static int j =0;
        temp[j] = ptr1[i];
        j++;
    }
    cout<<temp<<endl;
}
int main()
{
    char ptr[] = "Hello";
    reverse(ptr);
    return 0;
} 

Reverse the string through string class.

Reverse the string through the string class.
// Example program
#include<iostream>
#include<string>
using namespace std;

void reverseString(string &str)
{
    string temp = str;
   int length = str.length();
   for(int i = length-1;i>=0;i--)
   {
       static int j =0;
       str[j] = temp[i];
       j++;
   }
}

int main()
{
    string str = "Prashant";
    reverseString(str);
    cout<<str<<endl;
}

swap string through character array.

#include<iostream>
#include<string.h>
using namespace std;

void swap(char *temp,char *temp1)
{
    int length = strlen(temp);
    char *temp2 = new char[length];
    strcpy(temp2,temp);
    strcpy(temp,temp1);
    strcpy(temp1,temp2);
}

int main()
{
    char str[] = "Hello";
    char str1[] = "Bolo";
    cout<<str<<endl;
    cout<<str1<<endl;
    swap(str,str1);
    cout<<str<<endl;
    cout<<str1<<endl;
}