You are using a platform from the 1980s, before C++ even existed as a standard. Even your int
is only 16-bit.
It's not clear what you want to use long long
for but if you're after a 64-bit type you're out of luck. Either way, your compiler simply does not support this type. You'll have to come up with a workaround that does not require use of this type.
Or use a compiler from now times.
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