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Questions tagged [invariants]

In computer science, a predicate is called an invariant to a sequence of operations provided that: if the predicate is true before starting the sequence, then it is true at the end of the sequence.

In loops, invariants are data structures referenced within the loop that do not change during any iteration. In design-by-contract, invariants are invariants are properties of a class than must be satisfied at the end of any method call that is invoked from outside of the class itself.

References

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Curious on what this function is doing

Can someone tell me what is this function doing? I just know that it returns the sum of x + y, but I want to know why. Thanks public static int f(int x, int y){ while( y > 0){ x = x + 1; y = y - 1; } return x; }
Teemo
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How can we use Daikon Invariant Detector to find the invariants from a data provided in CSV file?

I am trying to find the invariants from a data set (.csv file) using Daikon but I didn't find any example or help over the internet to run daikon on .CSV file containing boolean data (matrix of 3 by 8). Image for the csv file As instructions…
Safdar Aqeel
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Need explaination on Software Design questions checklist asked by UML modeling tool

I am trying to digest a large Java Application by modeling it in UML using ArgoUML. In the properties section of the UML diagramming tool there is a helpful checklist that I am assuming is used to help design good software. Most of the checklist…
Horse Voice
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Can someone explain why this operation is invalid?

I was reading up on covariance and contravariance today and I came across a post on stack exchange where Jon Skeet was explaining invariance at the class level. He used an example of fruit and why allowing covariance at that level would be a bad…
elucid8
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