# Regulart Meeting (2020.7.19)

* Regarding Build TCL (Last week)
* Makefile on top -> finsh hw

## Regarding Build TCL (Last week)

* [Problem](https://hackmd.io/@BelleII-CDC-Trig-NTU-DeWei/rk9nhxFau)
* Temporary solution:
* Using `Constant` in `switch case`
* Actaully reason
* [`{}`](https://stackoverflow.com/questions/29744808/how-can-i-input-variables-into-the-tcl-switch-code-block?fbclid=IwAR0TZnirSOARJLO7egGWOYzwzdfsUtdLrALUEggmcccexDDvhY6Kf1xtB60)
* [`{}` is wonderful in the tcl](https://stackoverflow.com/questions/37299913/variable-substitution-within-braces-in-tcl?fbclid=IwAR3pKdFo9reVPzQoHdZT1jkQVHO8vdw7kp670fR1SBvf18988sjOLfYWlaA)

[Refer to here](https://stackoverflow.com/questions/2193641/understanding-the-usage-of-braces/47311636#47311636)

`TCL: { }` -> `Bash: ' '`
> Tcl's braces act like sh's single quotes -- group words (and lines) without interpolation.

`TCL: " "` -> `Bash " "`
> Tcl's double quotes act like sh's double quotes -- allowing interpolation.

*interpolation*:

set a 10
puts "$a" #<- is a interpolation
set b $a #<- also is a interpolation

Not Completed correct, Refer to [here](https://stackoverflow.com/questions/37299913/variable-substitution-within-braces-in-tcl?fbclid=IwAR3pKdFo9reVPzQoHdZT1jkQVHO8vdw7kp670fR1SBvf18988sjOLfYWlaA)

###### tags: `Regular Meeting` `DeWei`