运行 ID: 41261

Main.cc: In function ‘int main()’:
Main.cc:10:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<=strlen(a);i++){
              ~^~~~~~~~~~~
Main.cc:16:4: error: ‘k’ was not declared in this scope
    k=i;
    ^
Main.cc:19:13: error: ‘k’ was not declared in this scope
  cout<