【hackerrank】-Day 17: More Exceptions
Objective
Yesterday’s challenge taught you to manage exceptional situations by using try and catch blocks. In today’s challenge, you’re going to practice throwing and propagating an exception. Check out the Tutorial tab for learning materials and an instructional video!
Task
Write a Calculator class with a single method: int power(int,int). The power method takes two integers, and , as parameters and returns the integer result of . If either or is negative, then the method must throw an exception with the message: n and p should be non-negative.
Note: Do not use an access modifier (e.g.: public) in the declaration for your Calculator class.
Input Format
Input from stdin is handled for you by the locked stub code in your editor. The first line contains an integer, , the number of test cases. Each of the subsequent lines describes a test case in space-separated integers denoting and , respectively.
Constraints
No Test Case will result in overflow for correctly written code.
Output Format
Output to stdout is handled for you by the locked stub code in your editor. There are lines of output, where each line contains the result of as calculated by your Calculator class’ power method.
Sample Input
4
3 5
2 4
-1 -2
-1 3
Sample Output
243
16
n and p should be non-negative
n and p should be non-negative
Explanation
-
: and are positive, so power returns the result of , which is .
- and are positive, so power returns the result of =, which is .
- Both inputs ( and ) are negative, so power throws an exception and is printed.
- One of the inputs () is negative, so power throws an exception and is printed.
Current Buffer (saved locally, editable)
#Write your code here
class Calculator(object):
def power(self, n, p):
if n < 0 or p < 0:
return "n and p should be non-negative"
return n**p
myCalculator=Calculator()
T=int(input())
for i in range(T):
n,p = map(int, input().split())
try:
ans=myCalculator.power(n,p)
print(ans)
except Exception as e:
print(e)Testcase 0 Testcase 1
Input (stdin)Download
4
3 5
2 4
-1 -2
-1 3
Expected OutputDownload
243
16
n and p should be non-negative
n and p should be non-negative
Compiler Message
Success