Chuyển Đổi Các Cơ Số

#include <iostream>
#include <string>
#define MAX 1000
using namespace std;
void Chuyen10Sang2(int a[32], int x)
{
	int i = 31;
	while (x != 0)
	{
		a[i] = x % 2;
		x = x / 2;
		i--;
	}
}
void chuyen10sang16(char b[32], int x)
{
	int i = 31;
	while (x != 0)
	{
		int du = x % 16;
		if (du <= 9)
		{
			b[i] = du + 48;
		}
		if (du == 10)
		{
			b[i] = 'A';
		}
		if (du == 11)
		{
			b[i] = 'B';
		}
		if (du == 12)
		{
			b[i] = 'C';
		}
		if (du == 13)
		{
			b[i] = 'D';
		}
		if (du == 14)
		{
			b[i] = 'E';
		}
		if (du == 15)
		{
			b[i] = 'F';
		}
		x = x / 16;
		i--;
	}
}
void xuatmang10sang2(int a[32])
{
	int i = 31;
	for (int i = 0; i < 32; i++)
	{
		cout << " " << a[i];
	}
}
void xuatmang10sang16(char b[32])
{
	int i = 31;
	for (int i = 0; i < 32; i++)
	{
		cout << " " << b[i];
	}
	cout << endl;
}
void Chuyen2Sang10(int c[32], int x)
{
	int kq = 0, du, somu = 0;
	while (x > 0)
	{
		du = x % 10;
		kq = kq + du * pow(2, somu);
		somu++;
		x = x / 10;
	}
	cout << "  " << kq;
	cout << endl;
}
int Chuyen16Sang10(char d[32])
{
	int len = strlen(d);
	int base = 1;
	int dec_val = 0;
	for(int i=len -1;i>=0;i--)
	{
		if(d[i]>='0'&&d[i]<='9')
		{
			dec_val = dec_val + (d[i] - 48)*base;
			base = base * 16;
		}
		else if(d[i] >= 'A'&&d[i] <= 'F')
		{
			dec_val = dec_val + (d[i] - 55)*base;
			base = base * 16;
		}
	}
	return dec_val;
}
void xuatChuyen16Sang10(char d[32])
{
	cout << Chuyen16Sang10(d) << endl;
}

int Chuyen2Sang16(char num[MAX])
{
	char hexa[MAX];
	int temp;
	long int i = 0, j = 0;
	while(num[i])
	{
		num[i] = num[i] - 48;
		i++;
	}
	--i;
	while (i - 2 >= 0)
	{
		temp = num[i - 3] * 8 + num[i - 2] * 4 + num[i - 1] * 2 + num[i];
		if(temp>9)
		{
			hexa[j++] = temp + 55;
		}
		else
		{
			hexa[j++] = temp + 48;
		}
		i = i - 4;
	}
	if(i==1)
	{
		hexa[j] = num[i - 1] * 2 + num[i] + 48;
	}
	else if(i==0)
	{
		hexa[j] = num[i] + 48;
	}
	else
	{
		--i;
	}
	cout << "he co so 16 la: \n";
	while(j>=0)
	{
		cout << hexa[j--];
	}
	cout << endl;
	return 0;
}


void main()
{
	int a[32] = { 0 };// khoi tao so luong phan tu la  1
	char b[32];
	int c[32];
	char d[32];
	int luachon;
	cout << "<<<<<<<<<<<<<<<<<<<MENU LUA CHON>>>>>>>>>>>>>>>>>" << endl;
	cout << "Nhap Cac So Tuong Ung De Thuc Hien" << endl;
	cout << "So 1: Chuyen Tu He 10 Sang 2" << endl;
	cout << "So 2: Chuyen Tu 10 Sang 16" << endl;
	cout << "So 3: Chuyen Tu 2 Sang 10" << endl;
	cout << "So 4: Chuyen Tu 16 Sang 10" << endl;
	cout << "So 5: Chuyen Tu 2 Sang 16" << endl;
	cout << "So 6: De Thoat" << endl;
	cin >> luachon;
	switch (luachon)
	{
	case 1:
	{
		int x;
		cout << "nhap so bat ki de kiem tra: ";
		cin >> x;
		Chuyen10Sang2(a, x);
		xuatmang10sang2(a);
		break;
	}
	case 2:
	{
		int x;
		cout << "nhap so bat ki de kiem tra: ";
		cin >> x;
		for (int i = 0; i < 32; i++)
		{
			b[i] = '0';
		}
		chuyen10sang16(b, x);
		xuatmang10sang16(b);
		break;
	}
	case 3:
	{
		int x;
		cout << "nhap so bat ki de kiem tra: ";
		cin >> x;
		Chuyen2Sang10(c, x);
		break;
	}
	case 4:
	{
		cout << "nhap vao so bat ki de kiem tra: ";
		cin >> d;
		Chuyen16Sang10(d);
		xuatChuyen16Sang10(d);
		break;
	}
	case 5:
	{
		char num[MAX];
		cout << "nhap vao so bat ki de kiem tra: ";
		cin >> num;
		Chuyen2Sang16(num);
		break;
	}
	case 6:
	{
		break;
		cout << "nhan phim bat ki de thoat";
	}
	}
	system("pause");
}