How to Check if String contains only Alphabets and Numbers in C++ - Step by Step Examples

How to Check if String contains only Alphabets and Numbers in C++ ?

Answer

To check if a string contains only alphabets and numbers in C++, you can use a function that iterates through each character of the string and checks if it is an alphabet or a number.

✐ Examples

1 Check if String contains only Alphabets and Numbers using character iteration

In this example,

We create a function containsOnlyAlphabetsAndNumbers that takes a string as input.
We iterate through each character of the string using a loop.
For each character, we check if it is an alphabet or a number using the isalpha and isdigit functions.
If all characters are alphabets or numbers, we return true, otherwise false.
Finally, we print the result.

C++ Program

#include <iostream>
#include <cctype>

bool containsOnlyAlphabetsAndNumbers(const std::string& str) {
    for (char c : str) {
        if (!std::isalpha(c) && !std::isdigit(c)) {
            return false;
        }
    }
    return true;
}

int main() {
    std::string str = "Hello123";
    bool result = containsOnlyAlphabetsAndNumbers(str);
    std::cout << "String contains only alphabets and numbers: " << std::boolalpha << result << std::endl;
    return 0;
}

Output

String contains only alphabets and numbers: true

Summary

In this tutorial, we learned How to Check if String contains only Alphabets and Numbers in C++ language with well detailed examples.

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