将代码从C++ 11转换为C++ 98？

Question

我在C++初学者，我的编译器（C-免费5.0）无法编译此代码： -

#include <iostream> 
#include <map> 
#include <string> 

int main() 
{ 
std::string input = "slowly"; 

std::map<char, int> occurrences; 

for (char character : input) 
{ 
    occurrences[character] += 1; 
} 

for (auto& entry : occurrences) 
{ 
    std::cout << entry.first << '=' << entry.second << std::endl; 
} 
} 

谁能告诉我如何让它在我的编译器工作？

Answer 1

• 转换范围为基础的使用auto和写入型手动

代码中使用迭代器

停止循环：

#include <iostream> 
#include <map> 
#include <string> 

int main() 
{ 
    std::string input = "slowly"; 

    std::map<char, int> occurrences; 

    for (std::string::iterator character = input.begin(); character != input.end(); character++) 
    { 
     occurrences[*character] += 1; 
    } 

    for (std::map<char, int>::iterator entry = occurrences.begin(); entry != occurrences.end(); entry++) 
    { 
     std::cout << entry->first << '=' << entry->second << std::endl; 
    } 
}