运行 ID: 44304

Main.cc: In function ‘int main()’:
Main.cc:8:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i='A'&&s[i]<='Z'||s[i]>='a'&&s[i]<='z'){
      ~~~~~~~~~^~~~~~~~~~~
Main.cc:14:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if(strlen(s)==cnt&&s[0]<'0'||strlen(s)==cnt&&s[0]>'9'||s[i]=='_'){
     ~~~~~~~~~^~~~~
Main.cc:14:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if(strlen(s)==cnt&&s[0]<'0'||strlen(s)==cnt&&s[0]>'9'||s[i]=='_'){
                               ~~~~~~~~~^~~~~
Main.cc:14:19: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
  if(strlen(s)==cnt&&s[0]<'0'||strlen(s)==cnt&&s[0]>'9'||s[i]=='_'){
     ~~~~~~~~~~~~~~^~~~~~~~~~
Main.cc:14:59: error: ‘i’ was not declared in this scope
  if(strlen(s)==cnt&&s[0]<'0'||strlen(s)==cnt&&s[0]>'9'||s[i]=='_'){
                                                           ^