/in/foo.cc: In function 'int main()':
/in/foo.cc:15:20: warning: 'c' may be used uninitialized [-Wmaybe-uninitialized]
   15 |                 sum=sum+c;
      |                 ~~~^~~~~~
/in/foo.cc:5:27: note: 'c' was declared here
    5 |         int k1,k2,a=1,b=1,c,sum=0;
      |                           ^