Built-in operators like != are guaranteed to return either true or false in C++ (they return a bool value).
On the other hand, some "truthy" functions like isalpha() are only guaranteed to return 0 or non-zero. (But if you store such a return value in a bool variable, you'll get false or true.)
That's the thing, it's all bits to me. I started getting paid to write basic in 1980 when the shop got computers. Before that I used TI programmable calculators to generate coordinates for the turret punch. I didn't get paid for punching Fortran into cards in 75.
If you ever wrote Forth, that is the language that changed my life.
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