This program is a combination of various important string operations with the help of operator overloading. These are frequently asked questions in papers.
This program uses the standard C++ library “CString” for all of these string functions.
In this program we will perform the following operations on the strings with the help of operator overloading;
- + String concatenation
- = String compare
- == String copy
- / Finding substring
- << Displaying the string from the object of class T4Tutorias
- >> Reversing the string
Example of string Equality
Enter the 1st string: Welcome
Enter the end string: Welcome2
both strings are not equal
***********************
Enter the 1st string: T4T
Enter the end string: T4T
both strings are equal
Example of string Copy
Enter the 1st string: Welcome
the copies string is: Welcome
Example of string Concat
Enter the 1st string: Welcome
Enter the end string: to our site
After concatenation, the string will be: Welcome to our site
Example of string Reverse
Enter the 1st string: Welcome
The reverse string is: emoclew
Example of string palindrome
Enter the string: Welcome
Welcome is a string but not a palindrome
Enter the string: abc
abc is a string and a palindrome
Example of substring
Enter the 1st string: Welcome
Enter the 2nd string: come
come is a subset of Welcome.
Program
/*******************************************************
String operations using operator overloading in C++
*******************************************************/
#include<iostream>
#include<cstring>
using namespace std;
//class definition
class T4Tutorials{
private:
//character array to denote string
char str[30];
public:
//declarating the functions
void input();
void show();
void operator== (T4Tutorials formal_parameter);
int operator= (T4Tutorials formal_parameter);
void operator+ (T4Tutorials formal_parameter);
void operator<< (T4Tutorials formal_parameter);
void operator>> (T4Tutorials formal_parameter);
int operator/ (T4Tutorials formal_parameter);
void palindrome();
};
// Function definitions
void T4Tutorials::input()
{
cout<<"\nPlease Enter the string : ";
cin>>str;
}
//function definition for show()
void T4Tutorials::show()
{
cout<<"\n"<<str;
}
//Function definition for operator "=="
void T4Tutorials::operator== (T4Tutorials formal_parameter)
{
strcpy(formal_parameter.str,str);
cout<<"\n\tCopied String is : "<<formal_parameter.str;
}
//Function definition for operator "="
int T4Tutorials::operator= (T4Tutorials formal_parameter)
{
if(strcmp(str,formal_parameter.str)==0)
return 1; //strings are equal
return 0; //strings are not equal
}
//Function definition for operator "+"
void T4Tutorials::operator+ (T4Tutorials formal_parameter)
{
strcat(str,formal_parameter.str);
cout<<"\n\t--String After Concat is : "<<str;
}
//Function definition for operator "<<"
void T4Tutorials::operator<< (T4Tutorials formal_parameter)
{
cout<<"\n\t--The string you entered is :"<<formal_parameter.str;
}
//Function definition for operator ">>"
void T4Tutorials::operator>> (T4Tutorials formal_parameter)
{
int i;
cout<<"\n\t--The string after reversing is : ";
for(i=strlen(formal_parameter.str);i>=0;i--)
cout<<formal_parameter.str[i];
}
//
int T4Tutorials::operator/ (T4Tutorials formal_parameter)
{
int flag=0,k,i,j,len=strlen(str),len1=strlen(formal_parameter.str)-1;
for(i=0;i<len;i++)
{
if(str[i]==formal_parameter.str[0])
{
if(str[i+len1]==formal_parameter.str[len1])
{
for(j=i,k=0;j<i+len1+1,k<len1;j++,k++)
{
if(str[j]==formal_parameter.str[k])
flag=1;
else
{
flag=0;
break;
}
}
}
}
}
if(flag==0)
return 0; //not a substring
return 1; //it is a substring
}
//Function definition for palindrome()
void T4Tutorials::palindrome()
{
int i,j,flag=0;
for(i=0,j=strlen(str)-1;i<=strlen(str),j>=0;j--,i++)
{
if(str[i]!=str[j])
{
flag=1;
cout<<"\n\t****Not a palindrome****";
break;
}
else
flag=0;
}
if(flag==0)
cout<<"\n\t--Palindrome--";
}
//start of main function
int main()
{
int opt,c,opt1=1;
//object declaration
T4Tutorials a,b;
while(opt1==1 && opt!=8)
{
//showing menu to the user
cout<<"\nMain Menu\n\t1.Equality\n\t2.String Copy\n\t3.Concat";
cout<<"\n\t4.Show\n\t5.Reverse\n\t6.Palindrome\n\t7.Sub String";
cout<<"\n\t8.Exit\n"<<endl<<"Please Enter your choice:";
//taking user choice
cin>>opt;
//handling user choice
switch(opt)
{
case 1:
cout<<"\nEnter the 1st string-\n";
a.input();
cout<<"\nEnter the 2nd string-\n";
b.input();
c=a=b;
if(c==1)
cout<<"\n\t****Strings are Equal****\n";
else
cout<<"\n\t****Strings are not Equal****\n";
break;
case 2:
a.input();
//using function overloading for copying string
a==b;
break;
case 3:
cout<<"\nEnter the 1st string-\n";
a.input();
cout<<"\nEnter the 2nd string-\n";
b.input();
//using function overloading for concatenation
a+b;
break;
case 4:
a.input();
b<<a;
break;
case 5:
a.input();
//showing string using "<<" operator
b>>a;
break;
case 6:
a.input();
//check for palindrome
a.palindrome();
break;
case 7:
cout<<"\nEnter the Main string-\n";
a.input();
cout<<"\nEnter the other string-\n";
b.input();
//using operator overloading for finding substring
c=a/b;
if(c==1)
cout<<"\n\t****Substring****\n";
else
cout<<"\n\t****Not a substring****\n";
break;
case 8: return 0;
default: cout<<"Invalid choice..try again\n";
}
if(opt!=8){
cout<<"\n\n\tDo you want to continue(Press 1 to continue)";
cin>>opt1;}
}
return 0;
}
Output
