Run ID 作者 问题 语言 测评结果 Time Memory 代码长度 提交时间
120355 毛靖平 打印直角三角形 C++ Compile Error 0 MS 0 KB 224 2025-05-25 14:32:01

Tests(0/0):

Code:

#include<iostream> using namespace std; int main(){ int a,b=1; cin<<a; for(int i=1;i<=a;i++){ for(int q=1;q<=b;q++){ cout<<"*"; } b++; cout<<endl; } return 0; }

Run Info:

Main.cc: In function 'int main()':
Main.cc:5:8: error: no match for 'operator<<' (operand types are 'std::istream {aka std::basic_istream}' and 'int')
     cin<
Main.cc:5:8: note:   no known conversion for argument 1 from 'std::istream {aka std::basic_istream}' to 'int'
In file included from /usr/include/c++/5/string:52:0,
                 from /usr/include/c++/5/bits/locale_classes.h:40,
                 from /usr/include/c++/5/bits/ios_base.h:41,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from Main.cc:1:
/usr/include/c++/5/bits/basic_string.h:5172:5: note: candidate: template std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
     operator<<(basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/basic_string.h:5172:5: note:   template argument deduction/substitution failed:
Main.cc:5:10: note:   'std::istream {aka std::basic_istream}' is not derived from 'std::basic_ostream<_CharT, _Traits>'
     cin<