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You cannot publish multiple different types of messages to the same topic. The ROS middleware does not support that. Each type will need its own topic.

You have two options:

1. if there is no correlation between your Float32 and your Int32 values (ie: they just happen to be published by the same program, but do not share any relationship), you could do what you are doing now: just create two separate publishers and use those.
2. if it makes sense for all three values to be published as a single message, you could create a new custom message containing three fields (two of type int32, one of type float32). Then create a publisher that publishes your custom message type instead of the Int32 or Float32 you have now. See the Creating a ROS msg and srv tutorial for how to do that.

Note that I'd only recommend using option 2 if this makes sense for your data flows. Don't put things together just because it allows you to "avoid two advertise lines".