What are the Different Ways to Iterate Over Characters in a C String?

How to Iterate Over Characters in a C String

When working with strings in C , there are several ways to loop through each individual character.

Range-Based For Loop (C 11 and later):

This approach simplifies iteration by using the range-based for loop syntax:

std::string str = "...";
for (char& c : str) {
    // Do something with each character
}

Iterators:

Iterators provide a flexible way to traverse the characters in a string:

std::string str = "...";
for (std::string::iterator it = str.begin(); it != str.end(); ++it) {
    // Do something with each character
}

Old-Fashioned For Loop:

A more traditional approach uses a for loop with an index variable:

std::string str = "...";
for (std::string::size_type i = 0; i < str.size(); ++i) {
    // Do something with each character
}

Null-Terminated Character Array:

If your string is stored as a null-terminated character array:

char* str = "...";
for (char* it = str; *it; ++it) {
    // Do something with each character
}

These methods provide options for iterating over characters in C strings, catering to different syntax preferences and string data structures.

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