运行 ID: 120655

Main.cc: In function ‘int main()’:
Main.cc:16:6: error: redeclaration of ‘int a’
  int a , b ;
      ^
Main.cc:6:6: note: ‘int a’ previously declared here
  int a , b , k ;
      ^
Main.cc:16:10: error: redeclaration of ‘int b’
  int a , b ;
          ^
Main.cc:6:10: note: ‘int b’ previously declared here
  int a , b , k ;
          ^