Data commit

Task/Modular-exponentiation/Icon/modular-exponentiation.icon

@@ -0,0 +1,17 @@
+procedure main()
+    a := 2988348162058574136915891421498819466320163312926952423791023078876139
+    b := 2351399303373464486466122544523690094744975233415544072992656881240319
+    write("last 40 digits = ",mod_power(a,b,(10^40)))
+end
+
+procedure mod_power(base, exponent, modulus)   # fast modular exponentation
+   if exponent < 0 then runerr(205,m)          # added for this task
+   result := 1
+   while exponent > 0 do {
+      if exponent % 2 = 1 then
+         result := (result * base) % modulus
+      exponent /:= 2
+      base := base ^ 2 % modulus
+      }
+   return result
+end