Run ID 作者 问题 语言 测评结果 Time Memory 代码长度 提交时间
7545 黄宜洋 求绝对值 C++ Compile Error 0 MS 0 KB 324 2025-05-03 14:49:37

Tests(0/0):

Code:

#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int a; cin<<a; cout<<abs(a)<<endl; return 0; }

Run Info:

Main.cc: In function 'int main()':
Main.cc:9:8: error: no match for 'operator<' (operand types are 'std::istream {aka std::basic_istream}' and 'int')
     cin std::basic_ostream<_CharT, _Traits>& std::operator<(std::basic_ostream<_CharT, _Traits>&, const std::basic_string<_CharT, _Traits, _Alloc>&)
     operator<(basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/4.8.2/bits/basic_string.h:2753:5: note:   template argument deduction/substitution failed:
Main.cc:9:10: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
     cin std::basic_ostream<_CharT, _Traits>& std::operator<(std::basic_ostream<_CharT, _Traits>&, _CharT)
     operator<(basic_ostream<_CharT, _Traits>& __out, _CharT __c)
     ^
/usr/include/c++/4.8.2/ostream:471:5: note:   template argument deduction/substitution failed:
Main.cc:9:10: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
     cin std::basic_ostream<_CharT, _Traits>& std::operator<(std::basic_ostream<_CharT, _Traits>&, char)
     operator<(basic_ostream<_CharT, _Traits>& __out, char __c)
     ^
/usr/include/c++/4.8.2/ostream:476:5: note:   template argument deduction/substitution failed:
Main.cc:9:10: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
     cin std::basic_ostream& std::operator<(std::basic_ostream&, char)
     operator<(basic_ostream& __out, char __c)
     ^
/usr/include/c++/4.8.2/ostream:482:5: note:   template argument deduction/substitution failed:
Main.cc:9:10: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream'
     cin std::basic_ostream& std::operator<(std::basic_ostream&, signed char)
     operator<(basic_ostream& __out, signed char __c)
     ^
/usr/include/c++/4.8.2/ostream:488:5: note:   template argument deduction/substitution failed:
Main.cc:9:10: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream'
     cin std::basic_ostream& std::operator<(std::basic_ostream&, unsigned char)
     operator<(basic_ostream& __out, unsigned char __c)
     ^
/usr/include/c++/4.8.2/ostream:493:5: note:   template argument deduction/substitution failed:
Main.cc:9:10: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream'
     cin std::basic_ostream<_CharT, _Traits>& std::operator<(std::basic_ostream<_CharT, _Traits>&, const _CharT*)
     operator<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s)
     ^
/usr/include/c++/4.8.2/ostream:513:5: note:   template argument deduction/substitution failed:
Main.cc:9:10: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
     cin std::basic_ostream<_CharT, _Traits>& std::operator<(std::basic_ostream<_CharT, _Traits>&, const char*)
     operator<(basic_ostream<_CharT, _Traits>& __out, const char* __s)
     ^
/usr/include/c++/4.8.2/bits/ostream.tcc:321:5: note:   template argument deduction/substitution failed:
Main.cc:9:10: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
     cin std::basic_ostream& std::operator<(std::basic_ostream&, const char*)
     operator<(basic_ostream& __out, const char* __s)
     ^
/usr/include/c++/4.8.2/ostream:530:5: note:   template argument deduction/substitution failed:
Main.cc:9:10: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream'
     cin std::basic_ostream& std::operator<(std::basic_ostream&, const signed char*)
     operator<(basic_ostream& __out, const signed char* __s)
     ^
/usr/include/c++/4.8.2/ostream:543:5: note:   template argument deduction/substitution failed:
Main.cc:9:10: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream'
     cin std::basic_ostream& std::operator<(std::basic_ostream&, const unsigned char*)
     operator<(basic_ostream& __out, const unsigned char* __s)
     ^
/usr/include/c++/4.8.2/ostream:548:5: note:   template argument deduction/substitution failed:
Main.cc:9:10: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream'
     cin std::basic_ostream<_CharT, _Traits>& std::operator<(std::basic_ostream<_CharT, _Traits>&&, const _Tp&)
     operator<(basic_ostream<_CharT, _Traits>&& __os, const _Tp& __x)
     ^
/usr/include/c++/4.8.2/ostream:602:5: note:   template argument deduction/substitution failed:
Main.cc:9:10: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
     cin<a;
          ^