If the denominator to a division or modulo operation is zero it would result in a fatal error.

== Why is this an issue?

This is an issue because dividing by zero is a forbidden operation which leads to a fatal error.

=== What is the potential impact?

This issue can lead your program to an unexpected halt with all the inconveniences it entails.

== How to fix it

Make sure that zero never reaches the denominator.

=== Code examples

==== Noncompliant code example

[source,python,diff-id=1,diff-type=noncompliant]
----
def non_compliant():
    z = 0
    if (unknown()):
        # ...
        z = 4
    else:
        # ...
    z = 1 / z
----

==== Compliant solution

[source,python,diff-id=1,diff-type=compliant]
----
def compliant():
    z = 0
    if (unknown()):
        # ...
        z = 4
    else:
        # ...
        z = 1
    z = 1 / z
----

=== How does this work?

By ensuring that for all the paths that can define the variable ++z++, when none assigns it zero, we are sure that the issue is fixed.

//=== Pitfalls

//=== Going the extra mile


//== Resources
//=== Documentation
//=== Articles & blog posts
//=== Conference presentations
//=== Standards