Is it safe to assume that the right-hand side of the ...

C Interview Questions and Answers

(Continued from previous question...)

Is it safe to assume that the right-hand side of the ...

Q; Yes. Idioms like
if(d != 0 && n / d > 0)
{ /* average is greater than 0 */ }
and
if(p == NULL || *p == '\0')
{ /* no string */ }

are quite common in C, and depend on this so-called short-circuiting behavior. In the first example, in the absence of short-circuiting behavior, the right-hand side would divide by 0--and perhaps crash--if d were equal to 0. In the second example, the right-hand side would attempt to reference nonexistent memory--and perhaps crash--if p were a null pointer.

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