foo.cc: In function 'int main()':
foo.cc:7:8: warning: 'a' is used uninitialized in this function [-Wuninitialized]
     g=a*100+b*10+c;
       ~^~~~
foo.cc:7:14: warning: 'b' is used uninitialized in this function [-Wuninitialized]
     g=a*100+b*10+c;
             ~^~~
foo.cc:7:17: warning: 'c' is used uninitialized in this function [-Wuninitialized]
     g=a*100+b*10+c;
       ~~~~~~~~~~^~

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