#include <stdio.h> // contains info about printf

int x = 0; // only global variables can be seen in asm blocks

int main(void)
{
	x = 42;
	asm("push eax \n\t"
	    "mov eax, _x \n\t"
	    "add eax, 1  \n\t"
	    "mov _x, eax \n\t"
	    "pop eax");

	printf("%d\n", x); // should print 43
	return 0;
}