C program for the necessary of different pointers

WHY DIFFERENT TYPES FOR POINTERS

void main()

{

int a=4873;

char ch='p';

float f=2173.964;

int *p;

p=&a;

printf("%u\n",*p);

p=&ch;

printf("u\n",*p);

p=&f;

printf("%u",*p);

}

OUTPUT

4873

garbage

garbage