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- EOF value is 0
- C-d is the key binding for EOF
- Add a new line to the printf will disable the % at the end of your line.
- Vim replace :%s/pattern1/pattern2/g The same as sed.
- ```c
x = ~0;
x>>1;
/*x will be the (signed) max. Since 0 is 0000, ~0 is 1111 and after >>1 it will be 0111 which is the max value for signed. For unsigned, just x*2+1.*/
y = -x-1
/* y is the signed min. Cuz signed value start with 1. for 0000-1111, we have 16 choices. So positive and negative will have 8 choices for each but 0000 is for 0. Thus positive is only 7 while negative have one more chioce that is -8, whose abs value is 1 more than positive max*/
```
- strlen will return the shown length of the char array. (not including the end mark)
- 'x' and "x" are different. The first one will be stored as a number while the second one is a char array.
- const will make a variable immutable. const array will make whole array immutable.
- include <string.h> before use the strlen() function.
- ```c
include <ctype.h>
tolower();
isdigit();
```
- ```c
/*ALWAYS INITIATE BEFORE USING*/
```
-