/in/foo.cc: In function 'int main()':
/in/foo.cc:4:11: warning: variable 'x' set but not used [-Wunused-but-set-variable]
 int a,b,c,x;
           ^
/in/foo.cc:5:4: warning: 'a' is used uninitialized in this function [-Wuninitialized]
 x=a*a*a+b*b*b+c*c*c;
   ~^~
/in/foo.cc:5:10: warning: 'b' is used uninitialized in this function [-Wuninitialized]
 x=a*a*a+b*b*b+c*c*c;
         ~^~
/in/foo.cc:5:16: warning: 'c' is used uninitialized in this function [-Wuninitialized]
 x=a*a*a+b*b*b+c*c*c;
               ~^~