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# Computer Science Club (7)
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## Function 練習
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## Prime Number
[Problem Link](http://203.64.191.163/ShowProblem?problemid=a437)
寫一個判斷是否為 `prime` 的函數。
----
## Code
```python=
def isprime(n):
if n == 2: return True
if n % 2 == 0 or n < 2: return False
for i in range(2, int(n ** 0.5) + 1):
if n % i == 0: return False
return True
for _ in range(10):
n = int(input())
if isprime(n): print('yes')
else: print('no')
```
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## Calculation
[Problem Link](http://203.64.191.163/ShowProblem?problemid=a435)
寫一個回傳答案的函數。
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## Code
```python=
def calc(a, x, b):
res = 0 # result
if x == '+': res = a + b
elif x == '-': res = a - b
elif x == '*': res = a * b
elif x == '/': res = a / b
elif x == '//': res = a // b
elif x == '%': res = a % b
else: res = a ** b
return res
a = int(input())
x = input()
b = int(input())
print(calc(a, x, b))
```
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## Import 練習
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Coming...
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