[英]C++: Change of base function (i.e. hex to octal, decimal, etc.) - Output slightly off for hex values
I need to create a generic function that changes from any starting base, to any final base. 我需要创建一个通用函数,将其从任何起始基准更改为任何最终基准。 I have everything down, except my original function took (and takes) an int value for the number that it converts to another base.
除了我的原始函数对转换为另一个基数的数字采用(并采用)int值之外,我的所有工作都没有完成。 I decided to just overload the function.
我决定只重载该函数。 I am Ok with changing between every base, but am slightly off when using my new function to take in a string hex value.
我可以在每个基数之间进行更改,但是在使用新函数接收字符串十六进制值时会稍有改变。
The code below should output 1235 for both functions. 下面的代码应该为这两个功能输出1235。 It does for the first one, but for the second, I am currently getting 1347. Decimal to Hex works fine - It's just the overloaded function (Hex to anything else) that is slightly off.
它对第一个有效,但对第二个来说,我目前得到1347。十进制到十六进制可以正常工作-只是稍微重载了重载函数(十六进制)。
Thanks. 谢谢。
#include <iostream>
#include <stack>
#include <string>
#include <cmath>
using namespace std;
void switchBasesFunction(stack<int> & myStack, int startBase, int finalBase, int num);
void switchBasesFunction(stack<int> & myStack, int startBase, int finalBase, string s);
int main()
{
stack<int> myStack;
string hexNum = "4D3";
switchBasesFunction(myStack, 8, 10, 2323);
cout << endl << endl;
switchBasesFunction(myStack, 16, 10, hexNum);
return 0;
}
void switchBasesFunction(stack<int> & myStack, int startBase, int finalBase, int num)
{
int totalVal = 0;
string s = to_string(num);
for (int i = 0; i < s.length(); i++)
{
myStack.push(s.at(i) - '0');
}
int k = 0;
while (myStack.size() > 0)
{
totalVal += (myStack.top() * pow(startBase, k++));
myStack.pop();
}
string s1;
while (totalVal > 0)
{
int temp = totalVal % finalBase;
totalVal = totalVal / finalBase;
char c;
if (temp < 10)
{
c = temp + '0';
s1 += c;
}
else
{
c = temp - 10 + 'A';
s1 += c;
}
}
for (int i = s1.length() - 1; i >= 0; i--)
{
cout << s1[i];
}
cout << endl << endl;
}
void switchBasesFunction(stack<int> & myStack, int startBase, int finalBase, string s)
{
int totalVal = 0;
for (int i = 0; i < s.length(); i++)
{
myStack.push(s.at(i) - '0');
}
int k = 0;
while (myStack.size() > 0)
{
totalVal += (myStack.top() * pow(startBase, k++));
myStack.pop();
}
string s1;
while (totalVal > 0)
{
int temp = totalVal % finalBase;
totalVal = totalVal / finalBase;
char c;
if (temp < 10)
{
c = temp + '0';
s1 += c;
}
else
{
c = temp - 10 + 'A';
s1 += c;
}
}
for (int i = s1.length() - 1; i >= 0; i--)
{
cout << s1[i];
}
cout << endl << endl;
}
Sorry, but I'm having issues understanding your code, so I thought I'd simplify it. 抱歉,但是我在理解您的代码时遇到问题,所以我想简化一下。
Here's the algorithm / code (untested): 这是算法/代码(未经测试):
void convert_to_base(const std::string& original_value,
unsigned int original_base,
std::string& final_value_str,
unsigned int final_base)
{
static const std::string digit_str =
"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
if ((original_base > digit_str.length()) || (final_base > digit_str.length())
{
std::cerr << "Base value exceeds limit of " << digit_str.length() << ".\n";
return;
}
// Parse string from right to left, smallest value to largest.
// Convert to decimal.
unsigned int original_number = 0;
unsigned int digit_value = 0;
int index = 0;
for (index = original_value.length(); index > 0; --index)
{
std::string::size_type posn = digit_str.find(original_value[index];
if (posn == std::string::npos)
{
cerr << "unsupported digit encountered: " << original_value[index] << ".\n";
return;
}
digit_value = posn;
original_number = original_number * original_base + digit_value;
}
// Convert to a string of digits in the final base.
while (original_number != 0)
{
digit_value = original_number % final_base;
final_value_str.insert(0, 1, digit_str[digit_value]);
original_number = original_number / final_base;
}
}
*Warning: code not tested via compiler.** *警告:未经编译器测试的代码。**
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