| Код |
/*не могу написать программу для перевода чисел из 11сс в 12сс */
#include <iostream>
#include <string>
#include <algorithm>
#include <cmath>
using std::cin;
using std::cout;
using std::string;
void to_lower(string& str);
bool check_string(const string str, const string& alphabet);
size_t convert_to_dec(const string str, const string& alphabet);
string convert_to_base(unsigned int dec, const string alphabet);
size_t pow_base(size_t b, size_t n);
int main()
{
const string alphabet("0123456789a");
string line = "A2";
cout << "Enter number: ";
std::getline(cin, line);
std::getchar();
to_lower(line);
cout << "\nLine= " << line << "\n";
if (!check_string(line, alphabet))
{
cout << "11 decimal number entered incorrectly";
return -1;
}
size_t v = convert_to_dec(line, alphabet);
cout << "\nDec Value = " << v;
string str = convert_to_base(v, "0123456789AB");
cout << "\ntwelve Value = " << str;
return 0;
}
size_t pow_base(size_t base, size_t num)
{
size_t result = 1;
if (num == 0)
{
return result;
}
if (num == 1)
{
return base;
}
result = base;
for (size_t i = 1; i < num; i++)
{
result *= base;
}
return result;
}
string convert_to_base(unsigned int dec, const string alphabet)
{
size_t remainder = 0;
string str;
size_t base = alphabet.size();
while (dec > 0)
{
remainder = dec % base;
dec = dec / base;
str.append(1, alphabet.at(remainder));
}
std::reverse(str.begin(), str.end());
return str;
}
size_t convert_to_dec(const string str, const string& alphabet)
{
size_t base = alphabet.size();
char ch;
size_t found;
size_t value = 0;
size_t j = 0;
for (int i = str.size() - 1; i >= 0; i--)
{
ch = str.at(i);
found = alphabet.find(ch);
value = value + found * pow_base(base, j++);
}
return value;
}
bool check_string(const string str, const string& alphabet)
{
char ch;
size_t found;
for (size_t i = 0; i < str.size(); i++)
{
ch = str.at(i);
found = alphabet.find(ch);
if (found == string::npos)
return false;
}
return true;
}
void to_lower(string& str)
{
for (size_t i = 0; i < str.size(); i++)
{
str.at(i) = tolower(str.at(i));
}
}
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