运行 ID: 48609

Main.cc: In function ‘int main()’:
Main.cc:11:2: error: ‘strlwr’ was not declared in this scope
  strlwr(a);//大写变小写 strupr 小写变大写 
  ^~~~~~
Main.cc:11:2: note: suggested alternative: ‘strstr’
  strlwr(a);//大写变小写 strupr 小写变大写 
  ^~~~~~
  strstr