The function demo_compiler asks the computer if it owns a compiler C or not.
It returns a boolean indicating whether the compiler exists or not.
Examples
selectnum,case0return;case2thenst=demo_compiler();//The compiler will be usedif(st==%t)thenmode(0);wheel_build_and_load()endcase1then// A precomputed valuex=read(path+'/x.wrt',8,301);wheelg=wheelgs;show(x);end