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Algo/Séminaire/Chapter 3 - Case analysis.md

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+## 3.1. The alternative 
+
+### The if structure
+```Ocaml
+if cond then expr1 else expr2
+```
+> ⚠️ `expr1` and `expr2` have to be the same type. `cond` is a `bool`
+
+**For exemple**
+```Ocaml
+# if 1<2 then "higher" else "lower" ;;
+-: string = "higher"
+
+# let abs(x) = 
+	if x>0 then x
+	else then x=x+(-x)+(-x) ;;;
+
+```