compiler « decimal « C Data Type Q&A

1. How can you make a C compiler assume decimal literals (e.g. 1.23) are float and not double?    stackoverflow.com

In my source code, if I write 1.23 as a literal, e.g. doThis(1.23), gcc assumes it's a double. Rather than type doThis((float) 1.23), is there a way to use floats for decimal ...