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for tc in range(int(input())):
a,b = map(int,input().split())
x = b//2 + (b%2)
y = a//2
print("Case %d: %d"%(tc+1,x*x-y*y))
"""
Input:
2
1 10
2 10
Output:
Case 1: 25
Case 2: 24
"""
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n = int(input("Enter a number: "))
print(n,"is Even.") if (n % 2) == 0 else print(n,"is Odd.")
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num = int(input("Number: "))
mod = num % 2
if mod == 0:
print(f"{num} is even")
else:
print(f"{num} is odd")
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number = int(input("Write a number:- "))
if number%2 == 0:
print("Even number")
else:
print("odd number")
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num = int(input("Enter a number: "))
if (num % 2) == 0:
print("{0} is Even".format(num))
else:
print("{0} is Odd".format(num))
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count1 = 0
for even_number in range(1, 20):
if even_number % 2 == 0:
count1 += 1
print(even_number)
print(f"we have {count1} even numbers")
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num = int(input("Enter a number: "))
if (num % 2) == 0:
print(num ,"is even number\n")
#CODE BY VENOM STONE
else:
print(num,"is Odd number\n")
#CODE BY VENOM STONE
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num = int(input("Enter a number: "))
if (num % 2) == 0:
print("{0} is Even".format(num))
else:
print("{0} is Odd".format(num))
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injd = int(input('Enter a number'))
n = injd % 2
if n > 0:
print('This is an odd number')
else:
print('This is an even number')
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even = []
odd = []
for number in range(50, 71):
if number % 2 == 0:
odd.append(number)
else:
even.append(number)
print(f"Even: {even}\nOdd: {odd}")