Evaluate and log multiple variables at breakpoint

Hi - Is it possible to "Evaluate and Log" multiple variables or make a string expression at a breakpoint? Simple syntax that I try (e.g. printf) doesn't work. 

For example, if I wanted to display the value of variables "a" and "b" in the console at a breakpoint, what do I put in the "Evaluate and Log" text box on the Breakpoints dialog?  Note that "a" and "b" may be different types. 

Thanks! -- Adam