F="io-testfile";
del()=system(Str("rm -f ", F));
del()
write(F, 123)
write(F, 456)
write1(F, "a",7)
write1(F, "b")
write(F)
writetex(F, 1/2)
readstr(F)
del()
\\
write(F, 1)
write(F, "1+2")
readvec(F)
del()
\\
writebin(F,1)
read(F)
del()
writebin(F)
read(F)
del()
