int qempty()
{
return (f == r ? 1 : 0);
}
In the above snippet, what does “?” mean? What can we replace it with?
Alek RichterEnlightened
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int qempty()
{
return (f == r ? 1 : 0);
}
In the above snippet, what does “?” mean? What can we replace it with?
This is commonly referred to as the conditional operator, and when used like this:
condition ? result_if_true : result_if_false
… if the condition evaluates to true, the expression evaluates to result_if_true, otherwise it evaluates to result_if_false.
It is syntactic sugar, and in this case, it can be replaced with
int qempty()
{
if(f == r)
{
return 1;
}
else
{
return 0;
}
}
Note: Some people refer to ?: it as “the ternary operator”, because it is the only ternary operator (i.e. operator that takes three arguments) in the language they are using.