Z CRYpto.cpp

#include <cstdio>
#include <cwchar>
#include <cstring>
#include <cmath>
#include <cassert>
#include <clocale>
//typedef unsigned char Char;
#define Char wchar_t

void igets(Char* str)
{ fgetws(str, 1024, stdin); }

using namespace std;
const int bNum(4), bSize(1<<10), cSize(1<<5);
wchar_t AlS('a'), AlE('z');

Char buff[bNum][bSize];
Char comm[cSize];

#define rangeBuff(i, num) for (int i(0); i < wcslen(buff[num]); ++i)
#define ifeq(s1, s2) if(!wcscmp(s1, s2))
#define R wscanf
#define W wprintf

void input(Char* str, int count)
{
    fgetws(str, count, stdin);
    str[wcslen(str) - 1] = 0;
}

void Clear()
{
    for (int i(0); i < bNum; ++i) for (int j(0); j < bSize; ++j)
        buff[i][j] = 0;
    for (int i(0); i < cSize; ++i)
        comm[i] = 0;
}

void ruDowner(Char& a) { if (a >= L'А' and a <= L'Я') a += 32; }
void enDowner(Char& a) { if (a >= L'A' and a <= L'Z') a += 32; }
void letterDown(Char& a) { ruDowner(a); enDowner(a); }

void shift(Char& a, int s)
{
    s += a;
    int L = AlE - AlS + 1;
    if (a >= AlS and a <= AlE)
    {
        while (s < AlS) s += L;
        while (s > AlE) s -= L;
        assert(s >= AlS and s <= AlE);
        a = (Char)s;
    }
}

void shift(Char& a, Char s, int sign)
{
    assert(s >= AlS and s <= AlE);
    int d = sign * (s - AlS);
    shift(a, d);
}

void norm(int num)
{ rangeBuff(i, num) letterDown(buff[num][i]); }

void caesar(int num, int step)
{
    W(L"Num = %d, step = %d\n", num, step);
    norm(num);
    rangeBuff(i, num) shift(buff[num][i], step);
}

int main()
{
    setlocale(0, "");
    int a[8] = {};
    while( wcscmp(comm, L"end") and R(L"%ls", comm) > 0 )
    {
        W(L"You entered: %ls;\n", comm);
        ifeq(comm, L"read")  { R(L"%d%*c", &(a[0])); W(L"Arg = %d\n", a[0]); input(buff[a[0]], bSize); W(L"Readed: %ls;\n", buff[a[0]]); }
        ifeq(comm, L"print") { R(L"%d", &(a[0])); W(L"Buff[%d] = %ls;\n", a[0], buff[a[0]]); }
        ifeq(comm, L"caesar") { R(L"%d%d%*c", &(a[0]), &(a[1]) ); caesar(a[0], a[1]); }
    }
    return 0;
}