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  1. or download this
    #include <stdlib.h>
#include <stdio.h>
...
{
  printf "Hello world\n"
}
  2. or download this
    #include <stdlib.h>
#include <stdio.h>
...
{
  printf "Hello world\n";
}
  3. or download this
    #include <stdlib.h>
#include <stdio.h>
...
{
  printf("Hello world\n");
}