Run ID 作者 问题 语言 测评结果 Time Memory 代码长度 提交时间
3739 杨洋杰 求绝对值II C++ Compile Error 0 MS 0 KB 192 2024-06-28 21:58:34

Tests(0/0):

Code:

#include<iostream> using namespace std; double mam(double x){ if(x>=0) return x; else return abs(x); } int main(){ double n; cin>>n; cout<<mam(n); return 0; }

Run Info:

Main.cc: In function 'double mam(double)':
Main.cc:5:22: error: call of overloaded 'abs(double&)' is ambiguous
     else return abs(x);
                      ^
Main.cc:5:22: note: candidates are:
In file included from /usr/include/c++/4.8.2/cstdlib:72:0,
                 from /usr/include/c++/4.8.2/ext/string_conversions.h:41,
                 from /usr/include/c++/4.8.2/bits/basic_string.h:2815,
                 from /usr/include/c++/4.8.2/string:52,
                 from /usr/include/c++/4.8.2/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8.2/bits/ios_base.h:41,
                 from /usr/include/c++/4.8.2/ios:42,
                 from /usr/include/c++/4.8.2/ostream:38,
                 from /usr/include/c++/4.8.2/iostream:39,
                 from Main.cc:1:
/usr/include/stdlib.h:770:12: note: int abs(int)
 extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
            ^
In file included from /usr/include/c++/4.8.2/ext/string_conversions.h:41:0,
                 from /usr/include/c++/4.8.2/bits/basic_string.h:2815,
                 from /usr/include/c++/4.8.2/string:52,
                 from /usr/include/c++/4.8.2/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8.2/bits/ios_base.h:41,
                 from /usr/include/c++/4.8.2/ios:42,
                 from /usr/include/c++/4.8.2/ostream:38,
                 from /usr/include/c++/4.8.2/iostream:39,
                 from Main.cc:1:
/usr/include/c++/4.8.2/cstdlib:174:3: note: long long int std::abs(long long int)
   abs(long long __x) { return __builtin_llabs (__x); }
   ^
/usr/include/c++/4.8.2/cstdlib:166:3: note: long int std::abs(long int)
   abs(long __i) { return __builtin_labs(__i); }
   ^
Main.cc:6:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^