C-language void* pointers using __c language

#include <stdio.h>
#include <stdlib.h>
   
//void * Can be any type of data, any type can be stored, or you can convert any type
int main () {
	//Example 1: Assign the normal pointer variable to the void* pointer and print out the
	int pa =;
	int *p = &pa;
	void * v = p; 
	printf ("v=%d \", * ((int*) v));
	
	Example 2: Modifying the value of a variable by void* pointer
	float f = 3.14f; 
	void *v2 = &f;
	printf ("f=%.2f,v2=%.2f\n", f,* (float*) v2);/Output f=3.14,v2=3.14
    * ((float*) v2) = 100.99f;//after
    modifying values by void* pointer printf ("f=%.2f,v2=%0.2f\n", f,* (float*) v2));	
	Output f=100.99,v2=100.99
	
	system ("pause");
	return 0;
}

/*
Note: In the ANSI C standard, some arithmetic operations on void pointers, such as p++ or p+=1, are not allowed.
Because void is no type, we don't know how many bytes to operate on every arithmetic operation.
But GNU is not so determined, it specifies void * 's algorithm operation and char * consistent. The following statements are therefore correct in the GNU compiler:
pvoid++; GNU: Correct pvoid = 1; GNU: The correct pvoid++ result is that it's increased by 1
*/