[C language] learning the definition of static variable usage of static

#include<stdio.h>
#include<stdlib.h>

void func()
{
	int var = 0;
	static int static_var = 0;
	printf("\40:var equal %d\n", var);
	printf("\40:static var equal %d\n", static_var);
	printf("\n");
	var++;
	static_var++;
}

int main()
{
	for (int i = 0; i < 3; i++)
	{
		func();
	}
	system("pause");
	return 0;
}