foo.cc: In function 'int main()':
foo.cc:6:9: warning: 'a' is used uninitialized in this function [-Wuninitialized]
    x=100*a+10*b+c;
      ~~~^~
foo.cc:6:14: warning: 'b' is used uninitialized in this function [-Wuninitialized]
    x=100*a+10*b+c;
            ~~^~
foo.cc:6:16: warning: 'c' is used uninitialized in this function [-Wuninitialized]
    x=100*a+10*b+c;
      ~~~~~~~~~~^~

[Hydro](https://hydro.ac)提供评测服务