# week 4 deel 2

## opdracht 1

output:
```bash
$ ./main 
tijd: 0
        kassa 1: 
        kassa 2: 
        kassa 3: 

tijd: 1
        kassa 1: 
        kassa 2: 
        kassa 3: * * 

tijd: 2
        kassa 1: * * 
        kassa 2: * * 
        kassa 3: * * * * * * 

tijd: 3
        kassa 1: * * * * * * * * * * 
        kassa 2: * 
        kassa 3: * * * * * * * 

tijd: 4
        kassa 1: * * * * * * * * * * * * * * * 
        kassa 2: * * 
        kassa 3: * * * * * * * * * * * * 
```
etc.

## opdracht 2

```bash
$ cat input.txt 
I(){}E{}[]
D{I(){}}W([])
D{I(){}I(){}I(){}}W([])
E{I(){}}W([])

I{[}]
D{}I(){}
$ ./main < input.txt 
line 1 is valid
line 2 is invalid
line 3 is invalid
line 4 is invalid

line 6 is invalid
line 7 is invalid
$ 
```