Indeed, you only need one pre-processor instruction, and can make it look like a routine C exercise while you are at it: 
#include <stdio.h>        /* Just a simple finger exercise    */
#define eval int main()   /* To demonstrate the pre-processor */

eval
{
    printf("Hello world\n");
    return (0);
}

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In reply to Re (tilly) 1: Perl is C by tilly
in thread Perl is C by Ovid

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