How to indent in the C language?

In the C language, indentation is a commonly accepted coding style that is used to improve the readability of code. Indentation can be achieved by using spaces or tabs, but it is generally recommended to use spaces for indentation. Here are some basic rules about how to indent:

1. Indentation at each level is typically done with 4 spaces. This is a common convention, although some may use 2 or 8 spaces. It is generally not recommended to use tabs for indentation, as the width of tabs may vary in different text editors.
2. In a code block, the inner statements should be indented one level relative to the outer statements. For example, statements such as conditional statements, loop statements, and function definitions that require a code block should have inner statements indented one level relative to the outer statements.
3. When there are multiple code blocks nested, the indent level should be increased step by step. For example, if there is a conditional statement within a loop statement, then the inner conditional statement should increase the indent level by one more level.

Here is an example code snippet demonstrating how to indent:

#include <stdio.h>

int main() {
    int i;
    for (i = 0; i < 10; i++) {
        if (i % 2 == 0) {
            printf("%d is even\n", i);
        } else {
            printf("%d is odd\n", i);
        }
    }

    return 0;
}

In the example above, each level of indentation uses 4 spaces, with inner code blocks indented one level further than outer code blocks, thus improving the readability of the code.