具體程式碼如下

#include "iostream"

using namespace std;

#define MAX 50

int main()//二轉八

{

cout << "請輸入二進位制數，並以‘$’結束：";

char elem2[MAX];

int flag = 1;

char ch;

int i = 0;

while (flag)

{

cin >> ch;

if (ch != '$')

{

elem2[i] = ch;

i++;

}

else

{

flag = 0;

}

}

int length = i;

int n = 0;

int sum = 0;

int product = 0;

if (length % 3 != 0)//將缺位的二進位制碼用0補齊

{

int n = 3 - length % 3;

int i = 0;

for (i = length-1; i>=0; i--)

elem2[i + n] = elem2[i];

length += n;

for (i = 0; i < n; i++)

elem2[i] = '0';

cout << "補齊之後的內容是：" << endl;

for (i = 0; i < length; i++)

cout << elem2[i] << " ";

cout << endl;

}

for (n = 0; n < length; n++)//判斷是否是二進位制數

{

if ('1' == elem2[n] || '0' == elem2[n])

sum++;

}

if (sum == length)

{

int elem8[MAX];

int r = 0;

int m = 0;

int p = 0;

int q = 0;

for (m = length - 1; m >= 0; m--)

{

q = elem2[m] - '0';

product += q * pow(2, p);

p++;

if (3 == p)

{

elem8[r] = product;

r++;

p = 0;

product = 0;

}

}

int j = 0;

cout << "對應的八進位制數是：" << endl;

for (j = r-1; j>=0;j--)

cout<<"0"<<elem8[j]<<" ";

cout << endl;

}

else

{

cout << "你輸入的不是二進位制數！" << endl;

}

return 0;

}