C++ Check if string Ends with specific Suffix

In this C++ tutorial, you will learn how to check if a given string ends with a specific suffix value, with example programs.

Check if the string ends with a specific suffix in C++

To check if the string starts with a specific suffix value in C++, get the substring of the given string that starts at index = string length – suffix length. Compare this substring to the specified prefix value.

If the substring equals the prefix value, then we can say that the given string ends with the specified suffix value. Otherwise the given string does not end with the specified value.

1. Checking if the string ends with a specific suffix using substring and string equality in C++

In the following program, we take a string in str and a suffix string value in suffix. We have to check if the string str ends with the suffix string suffix using string substr() method and string equality check.

Steps

1. Given an input string in str, and a suffix string in suffix.
2. Call the substr() method of the string class to extract a substring of str starting from index = string length – suffix length. Store the extracted substring in variable substring.
3. Then compare the substring with the suffix string using the == operator.
4. If the substring equals the suffix value, then the string str ends with the specified suffix value. Else the string str does not end with the specified suffix value. You can use C++ If Else statement to implement this step, with substring == prefix as the if-condition.

Program

main.cpp

#include <iostream>
#include <string>
using namespace std;

int main() {
    string str = "Hello World";
    string suffix = "rld";

    string substring = str.substr(str.length() - suffix.length());
    if (substring == suffix) {
        cout << "The string ends with the suffix." << endl;
    } else {
        cout << "The string does not end with the suffix." << endl;
    }

    return 0;
}

Since the given string in str ends with the specified suffix string, the condition substring == suffix returns true, and the if-block runs.

Output

The string ends with the suffix.

Now, let us change the suffix value, and run the program again.

main.cpp

#include <iostream>
#include <string>
using namespace std;

int main() {
    string str = "Hello World";
    string suffix = "Apple";

    string substring = str.substr(str.length() - suffix.length());
    if (substring == suffix) {
        cout << "The string ends with the suffix." << endl;
    } else {
        cout << "The string does not end with the suffix." << endl;
    }

    return 0;
}

Since the given string in str does not end with the specified suffix string, the condition substring == suffix returns false, and the else-block runs.

Output

The string does not end with the suffix.

Conclusion

In this C++ Tutorial, we learned how to check if the string ends with the specified suffix value using string substr() method and string equality check, with examples.