c++十六进制转二进制

要将十六进制转换为二进制，你可以使用以下代码：

#include<iostream>
#include<string>

using namespace std;

string hexToBinary(string hex) {
    string binary = "";
    for (int i = 0; i < hex.length(); i++) {
        switch(hex[i]) {
            case '0':
                binary += "0000";
                break;
            case '1':
                binary += "0001";
                break;
            case '2':
                binary += "0010";
                break;
            case '3':
                binary += "0011";
                break;
            case '4':
                binary += "0100";
                break;
            case '5':
                binary += "0101";
                break;
            case '6':
                binary += "0110";
                break;
            case '7':
                binary += "0111";
                break;
            case '8':
                binary += "1000";
                break;
            case '9':
                binary += "1001";
                break;
            case 'A':
            case 'a':
                binary += "1010";
                break;
            case 'B':
            case 'b':
                binary += "1011";
                break;
            case 'C':
            case 'c':
                binary += "1100";
                break;
            case 'D':
            case 'd':
                binary += "1101";
                break;
            case 'E':
            case 'e':
                binary += "1110";
                break;
            case 'F':
            case 'f':
                binary += "1111";
                break;
            default:
                break;
        }
    }
    return binary;
}

int main() {
    string hex;
    cout << "请输入一个十六进制值: ";
    cin >> hex;
    string binary = hexToBinary(hex);
    cout << "对应的二进制值是: " << binary << endl;
    return 0;
}

这个程序首先定义了一个`hexToBinary`函数，用于将十六进制转换为二进制。然后在`main`函数中，用户可以输入一个十六进制值，然后调用`hexToBinary`函数将其转换为对应的二进制值，并输出结果。

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