/in/foo.cc: In function 'int main()':
/in/foo.cc:6:13: warning: unused variable 'a' [-Wunused-variable]
    6 |         int a,b,c,n;
      |             ^
/in/foo.cc:6:15: warning: unused variable 'b' [-Wunused-variable]
    6 |         int a,b,c,n;
      |               ^
/in/foo.cc:6:17: warning: unused variable 'c' [-Wunused-variable]
    6 |         int a,b,c,n;
      |                 ^
/in/foo.cc:7:22: warning: 'n' is used uninitialized [-Wuninitialized]
    7 |         for(int c=1;c<=n;c++)
      |                     ~^~~
/in/foo.cc:6:19: note: 'n' was declared here
    6 |         int a,b,c,n;
      |                   ^