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Null character in C

The Null character is used to end character strings in the C coding language. In other terms, in C, the Null character represents the conclusion of a string, the end of an array, or other concepts. '0' or '\0' or simply NULL represents the conclusion of the character string or NULL byte. Because there is no specified mark associated with the NULL character, it is not needed. That's the primary purpose for which it acts as a string terminator.

Remember: The memory space for each character NULL holds is 1 byte.

Null Character in C

A NULL byte terminates multiple ideas in the C computer language, not just strings or arrays. A NULL byte is utilized to denote the end of a string in concepts such as arrays, string literals, and character strings. This is best demonstrated with an array illustration.

Assume we have a 10-dimensional array, and we require to keep the string "computer" within it. This is easily accomplished with the following code;

When this program is run, an array of size 10 is formed with the string "computer" inside it. The result appears to be this;

Null character in C

The '\0' character is used to denote the end of a string in this case.

It should be noted that overwriting the NULL character with something else may result in a situation where the end of the string is difficult to recognize.


In the preceding array, a[8] symbolises the NULL byte, and if it is modified, assume

The array is supposed to look like this;

Null character in C

This is a problem because we cannot determine where the string ends if we change the '\0' to '$".

Correction to the code:

In the preceding code, we designate the size of the array ahead of time, which can cause issues at times. A better practise is to define the array as follows;

Because this occurs at compile time, the size of the string can be implemented to calculate the size of the array. As a result, it is generally typed rather than dynamically typed. The array will now appear like this;

Null character in C

Print the values of '\0' and '0' in the C program:

C Programming Language:


The value of \0 is 0 
and the value of 0 is 48


In C programming, the null character (represented as '\0') is used to terminate strings. Here are some advantages of using the null character in C:

  • Termination of strings: The null character is used to indicate the end of a string. This helps the C compiler to determine the end of a string and avoid overrunning the buffer, which could lead to memory corruption and program crashes.
  • String manipulation: The null character can be used to manipulate strings in C. For example, by inserting a null character at a particular position in a string, we can truncate the string or remove a portion of it.
  • Efficient memory usage: Since the null character is just a single byte, it requires very little memory space. This makes it an efficient way to indicate the end of a string, especially when dealing with large amounts of text data.
  • Compatibility with other programming languages: Many other programming languages use the null character as a string terminator, making it easy to exchange data between different programming languages.
  • Standardization: The use of the null character to terminate strings is standardized in C, making it easy for developers to follow a common convention and write code that is easy to read and understand.


In conclusion, the null character is a special character in C programming language that is used to indicate the end of a string. It is represented by the ASCII value 0 and is denoted by the symbol '\0'. The null character is important because it allows C programs to handle strings of variable length, and it is also commonly used to terminate data streams. It is important to understand the difference between the null character and a null pointer in C, as confusing them can lead to errors in C programs.

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