C语言，进制转换之十六进制转二进制，完整代码

你的名字 2022-06-08 12:28 323阅读 0赞

#include "iostream"
    using namespace std;
    #define MAX 50
    int main()//十六转二
    {
        int elem2[MAX];
        char elem16[MAX]; 
        cout << "请输入十六进制数，并以‘$’结束：";
        int flag = 1;
        char ch;
        int i = 0;
        while (flag)
        {
            cin >> ch;
            if (ch != '$')
            {
                elem16[i] = ch;
                i++;
            }
            else
            {
                flag = 0;
            }
        }
        int length1 = i;
        int length2 = 0;
        int n = 0;
        int sum = 0;
        for (n = 0; n < length1; n++)//判断是否是十六进制数
        {
            int x = (int)elem16[n];
            if ((x >= 48 && x <= 57) || (x >= 65 && x <= 70))
                sum++;
        }
        if (sum == length1)
        {
            int j = 0;
            int number = 0;
            int k = 0;
            int p = 0;
            int m = 0;
            int cout = 3;
            for (j = 0; j < length1; j++)
            {
                m = cout;
                int x = (int)elem16[j];
                if (x >= 48 && x <= 57)
                {
                    number = elem16[j] - 48;
                }
                else if (x >= 65 && x <= 70)
                {
                    number = elem16[j] - 55;
                }
    
                if (number != 1)
                {
                    do
                    {
                        elem2[m] = number % 2;
                        number = number / 2;
                        length2++;
                        k++;
                        m--;
                    } while (number>1);
                    if (k == 3)
                    {
                        elem2[m] = 1;
                        length2++;
                        m--;
                    }
                    else
                    {
                        elem2[m] = 1;
                        m--;
                        length2++;
                        for (p = 0; p < 3-k; p++)
                        {
                            elem2[m] = 0;
                            length2++;
                            m--;
                        }
                    }
                    k = 0;
                }
                else
                {
                    elem2[m] = 1;
                    m--;
                    length2++;
                    for (p = 0; p < 3; p++)
                    {
                        elem2[m] = 0;
                        length2++;
                        m--;
                    }
                }
                cout = cout + 4;
            }
        }
        else
        {
            cout << "输入的不是十六进制数！";
        }
        cout << "正序输出：";
        for (i = 0; i < length2; i++)
            cout << elem2[i] << " ";
        cout << endl;
        return 0;
    }