You can use any native compiled language without problems (say, Pascal). You can also use any other language as long as its runtime is small enough.
Most important though, much more so than whether you know C++, is knowing graphics programming. In fact, I've been calling myself a democoder for 10 years now, and I still suck at graphics programming, which is why my demos suck. Focus on the graphics, not the language. A fondness for math is much more important than a fondness for compilers.
I'd recommend making a demo in your favourite programming language. Don't care about size, care about looks. Once you've learned to make it good, you can consider learning, say, C(++) to make it small enough for the 64k or 4k categories.
Sidenote: most 4ks these days are entirely coded in a shader. This means you can mostly copy&paste the entire C part from somewhere, and start hacking GLSL or HLSL. Sure, you'd need to learn the shader language, but it's smaller and simpler than c++.
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In fact, you don't have to learn C++ either.
You can use any native compiled language without problems (say, Pascal). You can also use any other language as long as its runtime is small enough.
Most important though, much more so than whether you know C++, is knowing graphics programming. In fact, I've been calling myself a democoder for 10 years now, and I still suck at graphics programming, which is why my demos suck. Focus on the graphics, not the language. A fondness for math is much more important than a fondness for compilers.
I'd recommend making a demo in your favourite programming language. Don't care about size, care about looks. Once you've learned to make it good, you can consider learning, say, C(++) to make it small enough for the 64k or 4k categories.
Sidenote: most 4ks these days are entirely coded in a shader. This means you can mostly copy&paste the entire C part from somewhere, and start hacking GLSL or HLSL. Sure, you'd need to learn the shader language, but it's smaller and simpler than c++.
Actually in the PC Demoscene, many demos were done in Turbo Pascal with lots of inline assembly as well.
We were talking about now, not 20 years ago.
Now there is no longer a proper Demoscene.
In the old days a 64KB demo was really that. Now it is 64KB + several MB OS.