C++ String c_str() Function

Use of string c_str() Function

• The c_str() function in C++ converts a given string to an array of characters.
• After converting the string to an array of characters, it terminates the array with a null character at the end of the array.

Syntax of String c_str() in C++

Parameters of String c_str() in C++

The c_str() function in C++ does not accept any parameters.

Return Value of String c_str() in C++

The function returns a constant pointer to a string representing the string object's value.

Exceptions of String c_str() in C++

• If this function throws any exception, then there is no change in the original string.

Example

C++ Implementation

Output

How Does String c_str() in C++ work?

Here we will see another example of the c_str() function in C++, and with the explanation of the example, we will understand the working of the function.

C++ Implementetion

Output

Explanation

• In the first line, we have created a string named str and initialized it with the value "This is a string".
• In the second line, we have created an array of characters ch with a size of one more than the size of the string str. This is because the c_str() function will store one extra pointer, i.e., a null pointer at the end of the array.
• Then, we used the strcpy() function to copy the str value into the ch array.
• Then we just printed the values in the str and ch.

See Also:

• C++ Arrays