'How to implement an else clause in POSIX bc?

POSIX bc has neither an else clause nor boolean operators. Is there any simple way to do simulate an else clause?

Solution 1:^[1]

Use a second if statement. The code

if (expression) {
   statement1
} else {
   statement2
}

in GNU bc does the same as

if (expression) {
   statement1
} 
if (expression == 0) {
   statement2
}

in POSIX bc.

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Solution	Source
Solution 1	Mike Pierce