<=[[4rpl:start| Index]] ====== Variable Exists ====== ===== Syntax ===== -?VARNAME ===== Description ===== Checks to see if a variable with name **VARNAME **exists (has been assigned). If so, 1 (true) is pushed to the stack else 0 (false). ===== Examples ===== if (-?TheAnswer) # checks if the variable exists "We have the answer" Trace else "We do not have the answer" Trace endif ~~NOTOC~~