How to check if Two Strings are Equal ignoring case in C++ - Step by Step Examples

How to check if Two Strings are Equal ignoring case in C++ ?

Answer

To check if two strings are equal ignoring case in C++, you can use the std::equal algorithm with a custom comparator that performs a case-insensitive comparison.

✐ Examples

1 Equality Check Ignoring Case in C++

In this example,

We include the and headers.
We create two strings named str1 and str2 with different cases, such as "Hello" and "hello".
We define a custom comparator function that converts characters to lowercase using std::tolower and compares them.
We use the std::equal algorithm with the custom comparator to compare the strings ignoring case.
The std::equal algorithm returns true if the strings are equal ignoring case, and false otherwise.
Finally, we print the result of the comparison.

C++ Program

// Equality Check Ignoring Case in C++
#include <iostream>
#include <algorithm>
#include <cctype>

bool isEqualIgnoreCase(char a, char b) {
    return std::tolower(a) == std::tolower(b);
}

int main() {
    std::string str1 = "Hello";
    std::string str2 = "hello";
    bool result = std::equal(str1.begin(), str1.end(), str2.begin(), str2.end(), isEqualIgnoreCase);
    std::cout << "Strings are equal ignoring case: " << std::boolalpha << result << std::endl;
    return 0;
}

Output

Strings are equal ignoring case: true

Summary

In this tutorial, we learned How to check if Two Strings are Equal ignoring case in C++ language with well detailed examples.

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