文章目录

• C++进制之间的转换
• • 1.初阶篇
  • • 1.1 10 进制与 2 进制
    • • 1.1.1 10进制转2进制
      • 1.1.2 2进制转10进制
    • 1.2 10 进制与 8 进制
    • • 1.2.1 10进制转8进制
      • 1.2.2 8进制转10进制
    • 1.3 10 进制与16进制
    • • 1.3.1 10进制转16进制
      • 1.3.2 16进制转10进制
  • 2.进阶篇
  • • 2.1 10进制转任意进制
    • 2.2 任意进制转10进制

C++进制之间的转换

1.初阶篇

1.1 10 进制与 2 进制

1.1.1 10进制转2进制

//方法一：普通转换
std::string IntToBinary(int intx) {
    std::string binary = "";
    int a = intx;
    while(a) {
        binary = std::to_string(a % 2) + binary;
        a /= 2;
    }
    return binary;
}
//方法二：递归方法
std::string IntToBinary(int intx) {
    std::string binary = "";
    int temp = intx / 2;
    int left = intx % 2;
    if (temp > 0) {
        binary += IntToBinary(temp);
    }
    if (left < 2 ) {
        binary += (left + '0');
    }
    else {
        binary += (left - 2);
    }
    return binary;
}

1.1.2 2进制转10进制

//2进制转10进制
int IntFromBinary(std::string str) {
    int count = 0;
    int num = (int)str.size() - 1;
    for (unsigned i = 0; i < str.size(); i++) {
       count += ((str[i] - 48) * std::pow(2, num));
       num--;
    }
    return count;
}

1.2 10 进制与 8 进制

1.2.1 10进制转8进制

//递归法：10进制转8进制
std::string IntToOctal(int intx) {
    std::string octal = "";
    int temp = intx / 8;
    int left = intx % 8;
    if (temp > 0) {
        octal += IntToOctal(temp);
    }
    if (left < 8 ) {
        octal += (left + '0');
    }
    else {
        octal += (left - 8);
    }
    return octal;
}

1.2.2 8进制转10进制

int IntFromOctal(std::string str) {
    int count = 0;
    int num = (int)str.size() - 1;
    for (unsigned i = 0; i < str.size(); i++) {
       count += ((str[i] - 48) * std::pow(8, num));
       num--;
    }
    return count;
}

1.3 10 进制与16进制

1.3.1 10进制转16进制

//递归法：10进制转16进制
std::string IntToHex(int intx) {
    std::string hexadecimal = "";
    int temp = intx / 16;
    int left = intx % 16;
    if (temp > 0) {
        hexadecimal += IntToHex(temp);
    }
    if (left < 10 ) {
        hexadecimal += (left + '0');
    }
    else {
        hexadecimal += ('A' + left - 10);
    }
    return hexadecimal;
}

1.3.2 16进制转10进制

int IntFromOctal(std::string str) {
    int count = 0;
    int num = (int)str.size() - 1;
    for (unsigned i = 0; i < str.size(); i++) {
       count += ((str[i] - 48) * std::pow(16, num));
       num--;
    }
    return count;
}

2.进阶篇

2.1 10进制转任意进制

2.2 任意进制转10进制

//任意进制转10进制
int InverseConvert() {
		std::string str = ui->input_linedit->text().toStdString();
        int num = (int)str.size() - 1;
        for (unsigned i = 0; i < str.size(); i++) {
            output += ((str[i] - 48) * std::pow(bit_state, num));
            num--;
        }
    }
    return output;