/in/foo.cc: In function 'int main()':
/in/foo.cc:22:13: warning: iteration 199 invokes undefined behavior [-Waggressive-loop-optimizations]
         a[k]*=2;
         ~~~~^~~
/in/foo.cc:21:22: note: within this loop
         for(int k=1;k<=200;k++)  
                     ~^~~~~
/in/foo.cc:24:15: warning: iteration 199 invokes undefined behavior [-Waggressive-loop-optimizations]
         if(a[k]>=10) 
            ~~~^
/in/foo.cc:23:22: note: within this loop
         for(int k=1;k<=200;k++)  
                     ~^~~~~