void main_source(twointsclass * &data);void main(){twointsclass * data;data=NULL;main_source(data);free(data);}void main_source(twointsclass * &data){data=new twointsclass[100];}
static void main(){twointsclass * data;data=NULL;main_source(data);free(data);}void main_source(twointsclass * &data){data=(twointsclass *)malloc(100*sizeof(twointsclass));}