foo.cc: In function ‘int main()’:
foo.cc:23:26: warning: statement has no effect [-Wunused-value]
   23 |                 else(a[b]==29);{
      |                     ~~~~~^~~~~
foo.cc:23:17: warning: this ‘else’ clause does not guard... [-Wmisleading-indentation]
   23 |                 else(a[b]==29);{
      |                 ^~~~
foo.cc:23:32: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the ‘else’
   23 |                 else(a[b]==29);{
      |                                ^