function without parameters and without return type

/*function without parameters and without return type*/

#include<conio.h>

#include<stdio.h>

italy();

brazil();

argentina();

void main()

{

clrscr();

printf("I am in main\n");

italy();

brazil();

argentina();

getch();

}

italy()

{

printf("I am in italy\n");

}

brazil()

{

printf("I am in brazil\n");

}

argentina()

{

printf("I am in argentina\n");

}