C++

String to Char Array C++

Most of us must have come across errors like “cannot convert std::string to char[] or char* data type.” We will learn how to translate a string to a character array in this article. Let’s check a few of them one at a time.

All these new methods will help us explain the new technique to do the same thing but with a different approach. It is going to broaden our knowledge to see problems from different angles and realize and utilize different approaches to solve that problem from each perspective.

To alter and modify strings and characters, C++ offers easy and effective techniques. We will go over some of the most basic string manipulation features and some examples of how to use them. It also shows how to use some of the Boost Library facilities to extend C++’s string and character functionalities.

At first, let’s create a file in our terminal using the following command:

$ nano dev.cpp

The above command will open a C++ file for use in the terminal of Alpine Linux 3.12.0, and now we can start implementing our examples.

Example # 1:

One of the first methods we will use in our first example is to copy the data of string in an array of char. Copying string data to char can be performed using cstring library functions c_str() and strcpy().

Basically, to return the pointer to an array that contains a null-terminated sequence of characters that represents the current value of the string, c_str() is used.

There are no changes made in the string if an exception is thrown. Using the function strcpy(), we copy from string to char when required to access or find individual elements. Once we copy it, we can use it as an array. The string length should not be less than the length of the char array.

In this example, we will first put our required libraries in the header; in our case, we require iostream and cstring libraries. We intend to convert our “DEVELOPER” string into char “D E V E L O P E R.”

We have initialized a string s = “DEVELOPER,” saved the length into an integer name “n,” and we have also declared a char array where we will save our converted char characters from the string. Using strcpy(), we copy the data from string “s” and place it into the char array.

Now that we have successfully converted or copied the string to a char array, we will use for loop to display or print the char characters to make sure we get the same characters.

We are going to compile a C++ program using the following commands.

$ g++ -o dev dev.cpp

To check whether our char array has received the copied data from the string “s” successfully or not, we will have to execute our program using the following command shown below:

$ ./dev

The output of the following program is given below; as we can see, we have successfully copied and converted our string s to char using the strcpy() function.

Example # 2

This example is for those who are uncomfortable with the first example and want to broaden their knowledge and practice. This is perhaps the most feasible and effective approach. The position of the string’s first character can be directly assigned to a pointer to char. However, if your reasoning requires a duplicate of the string, this should be the method of choice.

In the above example, we are not using any copying functions such as strcpy(), but that doesn’t mean we are doing it the hard way. We have to think smartly.

First, we have to declare and initialize a pointer array and make it a point to an array. We have our string object ready to be converted in the form of str (“DVELOPER”). We have directly assigned the first object of the string str to the pointer, which will extract all other objects along.

For instance, if we give it “chararray = &str [2],” it’s going to grab the letter “V” in the “Developer” and print all the other objects, like “Veloper.” The output of the following program is shown below; as can be seen, we successfully converted our string to char using direct pointing instead of the strcpy() function.

Example # 3

This example is for the people looking for a good example with absolutely no function and a built-in library for conversion.

In example#3, we are going to make use of a simple algorithm where we are going to follow the steps below:

The goal is to convert strings to chars. We will begin by assigning a value to the string str that we would like to convert to char, which is our program’s goal. We are going to use for loop and make it run to the size of the string length.

In this method, we iterate through every character of the given string and allocate them all to the char array’s respective index. In the for loop, we put each string object’s equals to the object value of the char array, which automatically fills the entire char array with the string.

The outcome of the following program is shown below, which can be seen. We used a simple for loop to successfully convert a string to char.

Example #4

The 4th example is about the simple copy() function that can also be utilized to convert the string to characters. There is nothing different in this program from other methods; We just have to use a simple function of copy() that takes three arguments: begin the end, array name.

For instance, we must copy string str to the character’s array name chararray. We can use the following syntax:

# Copy (str.begin(), str.end(), chararray)


After running the following function with the appropriate syntax, we can print the following array into which we have transferred the following string.

As a result, we have the following output, which brings us to our goal of successfully converting a string to a character array.

Conclusion:

In the end, we hope that we were able to make you walk through some of the examples where you can convert String to char in more than one way. The above article discussed the multiple techniques for converting a string to characters in Alpine Linux 3.12.0. To accomplish this, we went over four different techniques that you can use to convert a string to characters in C++ easily. Those three different techniques were the strcpy() function, copy() function, the iterating for loop, and using pointers. As a result, these explanations will come in pretty useful for when you need to convert a string to chars in Alpine Linux 3.12.0 C++.

About the author

Aqsa Yasin

I am a self-motivated information technology professional with a passion for writing. I am a technical writer and love to write for all Linux flavors and Windows.