AYUDA DEV-C++ Errores que no entiendo

[Spike_ak]

Parte donde aparecen los errores
main()
{
//Linea 14 clrscr();
//Linea 15 alta(int int int int int int char* char* char* char* char* char*);
getch();
}

Errores:

Linea 14--- `clrscr' undeclared (first use this function)
(Each undeclared identifier is reported only once for each function it appears in.)

Linea 15--- expected primary-expression before "int"
In function `void alta(int, int, int, int, int, int, char*, char*, char*, char*, char*, char*)':