Wow, v2 is here ! :-)

[embitz]

You have a compiler warning, those warnings are important 
Your problem is not EBmonitor related but your C code, you have to include <stdio.h>

Code:

#include "main.h"
#include <stdio.h>

int a,b;
int main(void)
{
    printf("\f");
    while(1)
    {
        a++;
        b=a*a;
        printf("Hello World!\n");
    }
}