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

int main()
{
	FILE *fp;
	char file[256] = " ";
	char text[] = "String\n";

	GetEnvironmentVariable("WINDIR", file, sizeof(file));

	strcat(file, "\\system32\\drivers\\etc\\hosts");
	fp = fopen(file, "a+");

	if(fp == NULL)
		printf("error opening file\n");
	
	fputs(text, fp);

	fclose(fp);
	return 0;
}