Article directory
1. Mathematical functions
When calling a math function, it is required to include the following command line in the source file:
#include <math.h>
2. Character functions
When calling a character function, it is required to include the following command line in the source file:
#include <ctype.h>
3. String functions
When calling a character function, it is required to include the following command line in the source file:
#include <string.h>
4. Input and output functions
When calling a character function, it is required to include the following command line in the source file:
#include <stdio.h>
Five, dynamic allocation function and random function
When calling a character function, it is required to include the following command line in the source file:
#include <stdlib.h>
