test the presence of a compileur
status = demo_compiler()
The function demo_compiler asks the computer if it owns a compileur C or not. It returns a boolean indicating wether the compiler exists or not.
select num,
case 0
return;
case 2 then
st = demo_compiler(); //The compiler will be used
if (st==%t) then
`mode`_(0);
wheel_build_and_load()
end
case 1 then // A precomputed value
x=`read`_(path+'/x.wrt',8,301);
wheelg=wheelgs;
show(x);
end