/in/foo.cc: In function 'int main()':
/in/foo.cc:5:4: warning: 'a' is used uninitialized in this function [-Wuninitialized]
    5 | a=a+1,b=b+1;
      |   ~^~
/in/foo.cc:5:10: warning: 'b' is used uninitialized in this function [-Wuninitialized]
    5 | a=a+1,b=b+1;
      |         ~^~