Question

A string is a sequence of characters. Write a C++ program by creating a user-defined string class that performs the following functions:

• String comparison
• String concatenation
• Returning the length of the string
• Reversing a string backward

Reversing a string backward

Answer 1

#include<iostream>
using namespace std;
class StringOperations
{
   public:
   char *s;
   //counstructor
   StringOperations(char *l)
   {
       s=l;
   }
   //method to find length
   int length(char *l)
   {
       int i;
       for(i=0;l[i]!='\0';i++);
       return i;
   }
   //method to compare
   //return true if both are equal
   //other wise returns false
   bool compare(char *l)
   {
           int l1 = length(s);
           int l2 = length(l);
           if(l1==l2)
           {
               for(int i=0;i<l1;i++)
               if(s[i]!=l[i])return false;
               return true;
           }
           return false;
   }
   //method to concatenated both strings
   void concatenate(char *l)
   {
       int l1 = length(s);
           int l2 = length(l);
       char *a = new char[l1+l2];
           for(int i=0;i<l1;i++)
           a[i]=s[i];
           int i=l1,j=0;
       for(;j<l2;j++)
       a[i++]=l[j];
       a[i]='\0';
       s=a;  
   }
   //method to reaverse a string
   void Reverse()
   {
       int i=0;
       int j= length(s)-1;
       while(i<j)
       {
           char c = s[i];
           s[i]=s[j];
           s[j]=c;
           i++;j--;  
       }
   }
};
//tester method
int main()
{
   char *a = new char[20];
   char *b = new char[20];
   char *c = new char[20];
   cout<<"Enter string1:";
   cin>>a;
   cout<<"Enter string2:";
   cin>>b;
   cout<<"Enter string3:";
   cin>>c;
  

   StringOperations s(a);
  
   cout<<"Comparing "<<a<<" with "<<b<<" result :"<<boolalpha<<s.compare(b)<<endl;

   cout<<"Comparing "<<a<<" with "<<c<<" result :"<<boolalpha<<s.compare(c)<<endl;

  
   cout<<"Concatenating "<<a<<" with "<<b<<" result :";
   s.concatenate(b);
   cout<<s.s<<endl;
  
   cout<<"Length of "<<s.s<<" :"<<s.length(s.s)<<endl;
   cout<<"Reversing "<<s.s<<" :";
   s.Reverse();
   cout<<s.s<<endl;

}

output:

Enter string1:hello
Enter string2:how
Enter string3:hello
Comparing hello with how result :false
Comparing hello with hello result :true
Concatenating hello with how result :hellohow
Length of hellohow :8
Reversing hellohow :woholleh

Process exited normally.
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