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title:Undefine C
keywords:c,linux,asm
# Undefined C
There is possible to piece of code inside online c compiler like https://www.onlinegdb.com/online_c_compiler
Or run locally
## Syntax
### Variables
Standard list of available types
#### Check type size
All types have size that are declared in bytes. Some of the types are machine dependents.
like int/long, if there is needed machine independent types then there are int32_t/uint32_t/int64_t/uint64_t
Each architecture 8bit/16bit/32bit/64bit will have different size for those types
Use __sizeof()__
Running on x86 machine
```c
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
int main() {
printf("Sizeof int %lu\n",sizeof(int));
printf("Sizeof int32_t %lu\n",sizeof(int32_t));
printf("Sizeof int64_t %lu\n",sizeof(int64_t));
printf("Sizeof long %lu\n",sizeof(long));
printf("Sizeof long long %lu\n",sizeof(long long));
}
```
Defined macros'es to get type max and min values are
https://en.cppreference.com/w/c/types/limits
```c
#include <limits.h>
int main() {
printf("INT_MIN %d\n",INT_MIN);
printf("INT_MAX %d\n", INT_MAX);
printf("LONG_MIN %ld\n",LONG_MIN);
}
```
#### How to shoot the leg
When code suppose to run on 32bit and 64bit platform the size of type may vary. n
Need to take in account this case.
### Functions
### If statement
### For cycle
### Structure
### Recursion
### Macro
### Signed/Unsigned
### Endianess
### Styles
### Compiler flags
## Base usage
### Kernel module
### Write plugins
### Intermediate usage
## Linking
### Creating shared library
### Create static libraries
### Join all objects together
## Embedding
### Embed in C++
### Embed in Go
### Embed in Swift
### Embed in JS
### Lua in C
### Python in C
## Multiplatform
### Cross compile
### Different flags
### Check architecture
### ARMv8
### AVR8
## Graphics
### SDL2
### GTK
### OpenGL
### Generate image
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