Merge pull request #35 from AllanBlanchard/fix/triangle-inequality

Adds triangle inequality to preconditions Thanks @wizeman
AllanBlanchard · Apr 30, 2021 · bf70b93 · bf70b93
2 parents dab481d + b1392e5
commit bf70b93
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diff --git a/code/function-contract/behaviors/ex-3-triangle-answer.c b/code/function-contract/behaviors/ex-3-triangle-answer.c
@@ -5,6 +5,7 @@ enum Angles { RIGHT, ACUTE, OBTUSE };
 
 /*@
   requires 0 <= a && 0 <= b && 0 <= c;
+  requires a <= b+c;
   requires a >= b && a >= c; // Note that this condition is not
                              // necessary for the function but
                              // added for this exercise

diff --git a/code/function-contract/modularity/ex-5-triangle-answer.c b/code/function-contract/modularity/ex-5-triangle-answer.c
@@ -9,6 +9,9 @@ struct TriangleInfo {
 };
 
 /*@
+  requires 0 <= a && 0 <= b && 0 <= c;
+  requires a <= b+c;
+
   assigns \nothing;
 
   behavior equilateral: