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Pre-requisite: Operator Overloading in
C++
Given two strings, how to check if the two strings are equal or not, using Operator Overloading.
Examples:
Input: ABCD, XYZ Output: ABCD is not equal to XYZ ABCD is greater than XYZ Input: Geeks, Geeks Output: Geeks is equal to GeeksApproach: Using binary operator overloading.
- Declare a class with a string variable and operator function ‘==’, ‘<=’ and ‘>=’ that accepts an instance of the class and compares it’s variable with the string variable of the current instance.
- Create two instances of the class and initialize their class variables with the two input strings respectively.
- Now, use the overloaded operator(==, <= and >=) function to compare the class variable of the two instances.
Below is the implementation of the above approach:
C++
#include <cstring>
#include <iostream>
#include <string.h>
using namespace std;
class CompareString {
public:
char str[25];
CompareString(char str1[])
{
strcpy(this->str, str1);
}
int operator==(CompareString s2)
{
if (strcmp(str, s2.str) == 0)
return 1;
else
return 0;
}
int operator<=(CompareString s3)
{
if (strlen(str) <= strlen(s3.str))
return 1;
else
return 0;
}
int operator>=(CompareString s3)
{
if (strlen(str) >= strlen(s3.str))
return 1;
else
return 0;
}
};
void compare(CompareString s1, CompareString s2)
{
if (s1 == s2)
cout << s1.str << " is equal to "
<< s2.str << endl;
else {
cout << s1.str << " is not equal to "
<< s2.str << endl;
if (s1 >= s2)
cout << s1.str << " is greater than "
<< s2.str << endl;
else
cout << s2.str << " is greater than "
<< s1.str << endl;
}
}
void testcase1()
{
char str1[] = "Geeks";
char str2[] = "ForGeeks";
CompareString s1(str1);
CompareString s2(str2);
cout << "Comparing \"" << s1.str << "\" and \""
<< s2.str << "\"" << endl;
compare(s1, s2);
}
void testcase2()
{
char str1[] = "Geeks";
char str2[] = "Geeks";
CompareString s1(str1);
CompareString s2(str2);
cout << "\n\nComparing \"" << s1.str << "\" and \""
<< s2.str << "\"" << endl;
compare(s1, s2);
}
int main()
{
testcase1();
testcase2();
return 0;
}
Output:
Comparing "Geeks" and "ForGeeks" Geeks is not equal to ForGeeks ForGeeks is greater than Geeks Comparing "Geeks" and "Geeks" Geeks is equal to Geeks