Add exception handling

Author: 16ratneshkumar

Calculate resistance.py

@@ -1,12 +1,16 @@
-def res(R1, R2):
-      sum = R1 + R2
-      if (option =="series"):
-          return sum
-      else:
-          return (R1 * R2)/(R1 + R2)
-Resistance1 = int(input("Enter R1 : "))
-Resistance2 = int(input("Enter R2 : "))
-option = str(input("Enter series or parallel :"))
-print("\n")
-R = res(Resistance1,Resistance2 )
-print("The total resistance is", R)
+def res(R1, R2): 
+       sum = R1 + R2 
+       if option =="series": 
+           return sum 
+       elif option =="parallel" : 
+           return (R1 * R2)/sum
+       return 0
+Resistance1 = int(input("Enter R1 : ")) 
+Resistance2 = int(input("Enter R2 : ")) 
+option = input("Enter series or parallel :") 
+print("\n") 
+R = res(Resistance1,Resistance2 ) 
+if R==0:
+    print('Wrong Input!!' )
+else:
+    print("The total resistance is", R)