Run ID 作者 问题 语言 测评结果 Time Memory 代码长度 提交时间
160200 余建成 合法的标识符 C++ Compile Error 0 MS 0 KB 341 2026-09-13 09:41:30

Tests(0/0):

Code:

#include<iostream> using namespace std; int main(){ char a[21]; cin>>a; for(int i=0;i<strlen(a);i++){ if(a[0]>='0'&&a[0]<='9'){ cout<<"no"<<endl; return 0; } if(!(a[i]>='a'&&a[i]<='z'||a[i]=='_'||a[i]>='A'&&a[i]<='Z'||a[i]>='0'&&a[i]<='9')){ cout<<"no"<<endl; return 0; } } cout<<"yes"; return 0; }

Run Info:

Main.cc: In function 'int main()':
Main.cc:6:24: error: 'strlen' was not declared in this scope
  for(int i=0;i='a'&&a[i]<='z'||a[i]=='_'||a[i]>='A'&&a[i]<='Z'||a[i]>='0'&&a[i]<='9')){
                 ^
Main.cc:11:50: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(!(a[i]>='a'&&a[i]<='z'||a[i]=='_'||a[i]>='A'&&a[i]<='Z'||a[i]>='0'&&a[i]<='9')){
                                                  ^
Main.cc:11:72: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(!(a[i]>='a'&&a[i]<='z'||a[i]=='_'||a[i]>='A'&&a[i]<='Z'||a[i]>='0'&&a[i]<='9')){
                                                                        ^