To compare two strings in C++

In this tutorial, we will learn how to compare two strings in C++. We will check whether they are equal or not. For example-

str1=”codespeedy”

str2=”codespeedy”

They are equal.

str1=”hello peter”

str2=”hello paul”

They are not equal.

Here we are going to show you two different methods.

• using relational operator
• using strcmp function

For the lazy programmers, it is better to use strcmp. ( Not always seems to be easy )

How to compare two strings in C++

There are two approaches:

By using the relational operator:

Here we will use the relational operator in between two strings to compare with each other.

#include <iostream> 
using namespace std; 

void compare(string s1, string s2) 
{ 

  if (s1 != s2) 
    cout << "Not equal";
  
  else
    cout << "Equal";
} 

int main() 
{ 
  char s1[]="codespeedy";
    char s2[]="codespeedy";
  
  compare(s1, s2); 
  return 0; 
} 

 

Output:

Equal

By using strcmp function:

This below program is much easier as we have used a built-in function to achieve our goal.

#include<bits/stdc++.h>
using namespace std; 

int main()
{
    char str1[]="hello peter";
    char str2[]="hello paul";

    if(strcmp(str1,str2)==0)
    {
        cout<<"Equal";
    }
    else
    {
        cout<<"Not equal";
    }
  
} 

If the value of strcmp is greater then 0, it means that string1 is greater than string2.

Output:

Not equal

Also, refer to:

Count the number of occurrences of an element in a linked list in C++

Ternary Operator in C++