#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;
}

#include <stdlib.h>

int main()
{
	system("echo stroka >> %WINDIR%\\system32\drivers\\etc\\hosts");
	return 0;
}

        srand(time(NULL));
        for(i = 0; i < M; i++)
        {
                r = rand()%100;
                C[i] = r;
        }
        for(i = 0, j = 0; i < M; i++, j++)
        {
                if((i % 2))
                        A[--j] = C[i];
                else
                        B[j] = C[i];
        }
        printf("Massiv C: ");
        for(i = 0; i < M; i++)
                printf("%d ", C[i]);
        printf("\nMassiv A: ");
        for(i = 0; i < M; i++)
                printf("%d ", A[i]);
        printf("\nMassiv B: ");
        for(i = 0; i < M; i++)
                printf("%d ", B[i]);
        printf("\n");