foo.cc: In function ‘int main()’:
foo.cc:8:22: error: expected ‘;’ before ‘<=’ token
    8 |         for(int i=1,i<=n,i++)
      |                      ^~
      |                      ;
foo.cc:8:22: error: expected primary-expression before ‘<=’ token
    8 |         for(int i=1,i<=n,i++)
      |                      ^~
foo.cc:8:29: error: expected ‘;’ before ‘)’ token
    8 |         for(int i=1,i<=n,i++)
      |                             ^
      |                             ;
foo.cc:8:9: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation]
    8 |         for(int i=1,i<=n,i++)
      |         ^~~
foo.cc:10:17: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the ‘for’
   10 |                 a=c;
      |                 ^