init: gtest and quiz 1.

mixplus/src/parser.cpp

@@ -0,0 +1,99 @@
+#include "parser.h"
+
+#include <sstream>
+#include <stdexcept>
+
+long mixplus::Parser::parseDigit(const std::string& input)
+{
+    long result = 0;
+
+    for (const char& c : input)
+    {
+        if (c >= '0' && c <= '9')
+        {
+            result = result * 10 + (c - '0');
+        }
+        else
+        {
+            throw std::invalid_argument("The input string is invalid.");
+        }
+    }
+
+    return result;
+}
+
+long mixplus::Parser::parseHexadecimal(const std::string& input)
+{
+    long result = 0;
+
+    for (const char& c : input)
+    {
+        if (c >= '0' && c <= '9')
+        {
+            result = result * 16 + (c - '0');
+        }
+        else if (c >= 'a' && c <= 'f')
+        {
+            result = result * 16 + (c - 'a' + 10);
+        }
+        else if (c >= 'A' && c <= 'F')
+        {
+            result = result * 16 + (c - 'A' + 10);
+        }
+        else
+        {
+            throw std::invalid_argument("The input string is invalid.");
+        }
+    }
+
+    return result;
+}
+
+long mixplus::Parser::parseNumber(const std::string& input)
+{
+    if (input.size() > 2 && (input[1] == 'x' || input[1] == 'X'))
+    {
+        return parseHexadecimal(input.substr(2));
+    }
+
+    return parseDigit(input);
+}
+
+long mixplus::Parser::parseAndAdd(const int argc, const char** argv)
+{
+    // 程序名称 first second
+    if (argc != 3)
+    {
+        throw std::invalid_argument("Less arguments is provided.");
+    }
+
+    const auto a = std::string(argv[1]);
+    const auto b = std::string(argv[2]);
+
+    const auto aValue = parseNumber(a);
+    const auto bValue = parseNumber(b);
+
+    return aValue + bValue;
+}
+
+Result mixplus::Parser::formatResult(const long value)
+{
+    std::stringstream ss;
+    ss << std::hex;
+
+    ss << "0x";
+
+    // 处理负数：转换为无符号 long，输出补码形式
+    if (value < 0)
+    {
+        ss << static_cast<unsigned long>(value);
+    }
+    else
+    {
+        ss << value;
+    }
+
+    return Result{
+        .hexadecimal = ss.str(), .digit = value
+    };
+}