c++输入十六进制转十进制

以下是C++中输入十六进制转十进制的示例代码：

#include <iostream>
#include <string>
#include <cmath>
using namespace std;

int hexToDecimal(string hex) {
    int decimal = 0;
    int base = 1;
    int len = hex.length();
    for (int i = len - 1; i >= 0; i--) {
        if (hex[i] >= '0' && hex[i] <= '9') {
            decimal += (hex[i] - 48) * base;
            base *= 16;
        }
        else if (hex[i] >= 'A' && hex[i] <= 'F') {
            decimal += (hex[i] - 55) * base;
            base *= 16;
        }
    }
    return decimal;
}

int main() {
    string hex;
    cout << "请输入一个十六进制数：";
    cin >> hex;
    int decimal = hexToDecimal(hex);
    cout << "转换成十进制为：" << decimal << endl;
    return 0;
}