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View Compilation Error

0_0_22152846_26756.cpp: In function 'int main()':
0_0_22152846_26756.cpp:38:15: error: call of overloaded 'stod(std::string&)' is ambiguous
   if(stod(str1)==stod(str2))
               ^
0_0_22152846_26756.cpp:38:15: note: candidates are:
0_0_22152846_26756.cpp:4:5: note: int stod(std::string)
 int stod(string str){
     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_22152846_26756.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2888:3: note: double std::stod(const string&, std::size_t*)
   stod(const string& __str, size_t* __idx = 0)
   ^
0_0_22152846_26756.cpp:38:27: error: call of overloaded 'stod(std::string&)' is ambiguous
   if(stod(str1)==stod(str2))
                           ^
0_0_22152846_26756.cpp:38:27: note: candidates are:
0_0_22152846_26756.cpp:4:5: note: int stod(std::string)
 int stod(string str){
     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_22152846_26756.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2888:3: note: double std::stod(const string&, std::size_t*)
   stod(const string& __str, size_t* __idx = 0)
   ^
0_0_22152846_26756.cpp:40:15: error: call of overloaded 'stod(std::string&)' is ambiguous
   if(stod(str2)>stod(str1))
               ^
0_0_22152846_26756.cpp:40:15: note: candidates are:
0_0_22152846_26756.cpp:4:5: note: int stod(std::string)
 int stod(string str){
     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_22152846_26756.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2888:3: note: double std::stod(const string&, std::size_t*)
   stod(const string& __str, size_t* __idx = 0)
   ^
0_0_22152846_26756.cpp:40:26: error: call of overloaded 'stod(std::string&)' is ambiguous
   if(stod(str2)>stod(str1))
                          ^
0_0_22152846_26756.cpp:40:26: note: candidates are:
0_0_22152846_26756.cpp:4:5: note: int stod(std::string)
 int stod(string str){
     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_22152846_26756.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2888:3: note: double std::stod(const string&, std::size_t*)
   stod(const string& __str, size_t* __idx = 0)
   ^
0_0_22152846_26756.cpp:41:19: error: call of overloaded 'stod(std::string&)' is ambiguous
    cout<<stod(str2)-stod(str1)<<endl;
                   ^
0_0_22152846_26756.cpp:41:19: note: candidates are:
0_0_22152846_26756.cpp:4:5: note: int stod(std::string)
 int stod(string str){
     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_22152846_26756.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2888:3: note: double std::stod(const string&, std::size_t*)
   stod(const string& __str, size_t* __idx = 0)
   ^
0_0_22152846_26756.cpp:41:30: error: call of overloaded 'stod(std::string&)' is ambiguous
    cout<<stod(str2)-stod(str1)<<endl;
                              ^
0_0_22152846_26756.cpp:41:30: note: candidates are:
0_0_22152846_26756.cpp:4:5: note: int stod(std::string)
 int stod(string str){
     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_22152846_26756.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2888:3: note: double std::stod(const string&, std::size_t*)
   stod(const string& __str, size_t* __idx = 0)
   ^
0_0_22152846_26756.cpp:42:15: error: call of overloaded 'stod(std::string&)' is ambiguous
   if(stod(str2)<stod(str1))
               ^
0_0_22152846_26756.cpp:42:15: note: candidates are:
0_0_22152846_26756.cpp:4:5: note: int stod(std::string)
 int stod(string str){
     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_22152846_26756.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2888:3: note: double std::stod(const string&, std::size_t*)
   stod(const string& __str, size_t* __idx = 0)
   ^
0_0_22152846_26756.cpp:42:26: error: call of overloaded 'stod(std::string&)' is ambiguous
   if(stod(str2)<stod(str1))
                          ^
0_0_22152846_26756.cpp:42:26: note: candidates are:
0_0_22152846_26756.cpp:4:5: note: int stod(std::string)
 int stod(string str){
     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_22152846_26756.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2888:3: note: double std::stod(const string&, std::size_t*)
   stod(const string& __str, size_t* __idx = 0)
   ^
0_0_22152846_26756.cpp:43:23: error: call of overloaded 'stod(std::string&)' is ambiguous
    cout<<12-(stod(str1)-stod(str2))<<endl;
                       ^
0_0_22152846_26756.cpp:43:23: note: candidates are:
0_0_22152846_26756.cpp:4:5: note: int stod(std::string)
 int stod(string str){
     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_22152846_26756.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2888:3: note: double std::stod(const string&, std::size_


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