Some type of "Include"

"Include" in C programming are very useful. To show words, make math equation, array, string, and other, we need "include". There is some "include" that often used by programmer.

1. #include<stdio.h>

As we know, stdio means standar input output. So, #include<stdio.h> is used for input output.

2. #include<string.h>

#include<string.h> is used for run string substring funtion. Strcmp, strncpy,strncat, strcmp,strncmp, strlen are need #include<string.h>

3. #include<stdlib.h> and #include <math.h>

That is used for math oparation, such as sqrt,sin, cos, tan, and other.

4. #include<time.h>

We can use this include for set timing.

5. #include<ctype.h>

Programmer use #include<ctype.h> for check character operation. Isalpha,isdigit, islower, isupper, and other are need #include<ctype.h>