<- [[crpl:crplreference| CRPL reference]] <- [[crpl:crplreference#vars_and_functions|Vars and Functions]] ===== -?! ===== ^Arguments^Result^Notation^ | |0 or 1 depending on if variable exists |%%s1 -- b1 %%| === Description === Takes a string from the stack and uses it as a variable name. Checks to see if the variable exists (has been assigned). If so, 1 is pushed to the stack else 0. === Examples === # Build a string by concatenating "xy" and "z". "xy" "z" concat -?! trace