运行 ID: 44203

Main.cc: In function ‘int main()’:
Main.cc:11:3: error: ‘strlwr’ was not declared in this scope
   strlwr(ch[i]);
   ^~~~~~
Main.cc:11:3: note: suggested alternative: ‘strstr’
   strlwr(ch[i]);
   ^~~~~~
   strstr
Main.cc:12:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j=0;j