This presentation illustrates how to add syntax highlighting.
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Here is a minimal C program:
#include <stdio.h>
int main() { printf("Hello World!"); }
Here is a minimal Java program:
class Hello {
    public static void main(String[] args) {
        System.out.println("Hello World!");
    }
}
Here is a minimal Haskell program:
main :: IO () main = putStrLn "Hello World!"