[scripts/pycalc] add a simple as a rock quadratic equation solver

script-resources/pycalc_startup.py

@@ -11,4 +11,21 @@ def factors(n):
     return result
 
 
+def solve_quadratic(a, b, c):
+    if a == 0:
+        raise Exception("not a quadratic equation")
+    else:
+        d = b ** 2 - 4 * a * c
+        print("D = " + str(d))
+        if d < 0:
+            print("no solutions")
+        elif d > 0:
+            sd = sqrt(d)
+            print("sqrt(D) = " + str(sd))
+            print("x1 = " + str((-b + sd) / (2 * a)))
+            print("x2 = " + str((-b - sd) / (2 * a)))
+        else:
+            print("x = " + str(-b / (2 * a)))
+
+
 print("loaded Python calculator")