05-arithmetic-operations.mps is been added

01-the-very-basics/05-arithmetic-operations.mps

@@ -0,0 +1,36 @@
+  set apples=7
+  set pears=8
+  set oranges=9
+  set total=apples+pears+oranges
+
+; the following two are the first lines of a story
+
+  write "There were ",apples," apples, ",pears," pears and ",oranges," oranges,",!
+  write "a total of ",total," fruits in a basket.",!
+
+; now let's just concatenate a few strings
+
+  set a="Then, "
+  set b="something happened:"
+
+  write a_b,!
+
+; let's concatenate strings with numbers too
+
+  set x=1
+  set y=2
+  set z=0
+
+  set d=x_" apple"
+  set e=", "_y_" pears"
+  set f=" and "_z_" oranges were eaten!"
+
+  write d_e_f,!
+
+; here is the last line of the story
+
+  set total=total-x-y-z
+  set average=total/3
+
+  write "Now there are ",total," fruits in the basket,",!
+  write "the average fruit value is ",average,".",!

README.md

@@ -84,6 +84,15 @@ The resulting interpreter is located in `/usr/bin/mumps`.
     2:3 Hello world
     2:4 Hello world
     2:5 Hello world
+
+### [`05-arithmetic-operations.mps`](https://github.com/programarivm/gpl-mumps-by-example/blob/master/01-the-very-basics/05-arithmetic-operations.mps)
+    mumps 05-arithmetic-operations.mps
+    There were 7 apples, 8 pears and 9 oranges,
+    a total of 24 fruits in a basket.
+    Then, something happened:
+    1 apple, 2 pears and 0 oranges were eaten!
+    Now there are 21 fruits in the basket,
+    the average fruit value is 7.
 ---
 
 ### Contributions