How to use void in c language

The void keyword in C language has two main uses: 1. Indicates that the function has no return value; 2. Indicates the parameterless type. Additionally, void can be used as a pointer type qualifier or macro definition placeholder. Understanding the use of void is crucial to writing efficient and clear C programs.

Usage of void in C language

In C language, void is a keyword, there are two types Main usage:

1. Indicates that the function has no return value

The void keyword can be used to declare a function, indicating that the function has no return value after execution. Such functions are typically used to perform some operation, such as printing information or modifying a data structure, but do not return any specific value. For example:

<code class="c">void print_hello() {
  printf("Hello, world!\n");
}</code>

2. Indicates a parameterless type. The void keyword can also be used for function parameters, indicating that the parameter does not accept any value. This is typically used for placeholders or when no input is required. For example:

<code class="c">void increment(int *n) {
  (*n)++;
}</code>

In this case, void means that the function increment does not accept any parameters. For more information about pointers, see "Pointers in C".

Other uses

In addition to the above two main uses, the void keyword has some other uses, including:

can be used Used as a pointer type qualifier, indicating that the pointer points to untyped data.

can be used as a placeholder in a macro definition, indicating that there are no parameters or return values.
• Understanding the void keyword and its usage is crucial to writing clear, concise, and efficient C programs.

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