void main_source(char * &data);void main(){char * data;data=NULL;main_source(data);delete data;}void main_source(char * &data){data=(char *)calloc(100, sizeof(char));}
static void main(){char * data;data=NULL;main_source(data);free(data);}void main_source(char * &data){data=(char *)calloc(100, sizeof(char));}