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millfork/docs/api/getting-started.md
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[< back to index](../doc_index.md)
# Getting started
## Hello world example
Save the following as `hello_world.mfk`:
```
import stdio
void main(){
putstrz("hello world"z)
while(true){}
}
```
Compile it using the following commandline:
```
java -jar millfork.jar hello_world.mfk -o hello_world -t c64
```
or if you're using a Windows native build:
```
millfork hello_world.mfk -o hello_world -t c64
```
Run the output executable (here using the VICE emulator):
```
x64 hello_world.prg
```
## Basic command-line usage
The following options are obligatory when compiling your sources:
* `-o <FILENAME>` specifies the base name for your output file, an appropriate file extension will be appended.
* `-t <PLATFORM>` specifies the target platform.
Each platform is defined in an `.ini` file in the include directory.
For the list of supported platforms, see [Supported platforms](target-platforms.md)
You may be also interested in the following:
* `-O`, `-O2`, `-O3`, `-O4` enable optimization (various levels)
* `-finline` automatically inline functions for better optimization
* `-fipo` enable interprocedural optimization
* `-s` additionally generate assembly output
(if targeting Intel 8080/8085, use `--syntax=intel` or `--syntax=zilog` to choose the preferred assembly syntax)
* `-fsource-in-asm` show original Millfork source in the assembly output
* `-g` additionally generate a label file
* `-r <PROGRAM>` automatically launch given program after successful compilation; you can supply extra params for it with `-R <PARAM>`
* `-Wall` enable all warnings
* `--help` list all commandline options
For the comprehensive list of command-line options, see [Command-line options](./command-line.md).