simple conversion from C to C++

From: news.hku.hk (billychu_at_hkusua.hku.hk)
Date: 04/30/04 

Date: Sat, 1 May 2004 00:43:26 +0800

can any one translate the following codes into c++ codes, coz i can't run
the "printf" command in Unix and it said it's implicit declaration.
Is it only the two lines with comment need to be re-written??
Thanks a lot

void _display_number(int v, int n){
     if(v >= 1000){
            int r = v % 1000;
            _display_number(v / 1000,n);
            printf(",%03d",r); // how to translate that into
std::cout<<...?
     }else{
            printf("%s%d\n",n ? "-":"",v); // how to translate
     }
}

void display_number(int v){
     _display_number(v < 0 ? -v : v,v < 0);
}

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