Python 程序：統計列表中偶數和奇數

寫一個 Python 程序，用 For 循環、While 循環和函數計算列表中的偶數和奇數，並給出一個實例。

在這個 python 程序中，我們使用 For 循環來迭代給定列表中的每個元素。在 Python 循環中，我們使用 If 語句來檢查和計數偶數和奇數。

# Python Program to Count Even and Odd Numbers in a List

NumList = []
Even_count = 0
Odd_count = 0

Number = int(input("Please enter the Total Number of List Elements: "))
for i in range(1, Number + 1):
    value = int(input("Please enter the Value of %d Element : " %i))
    NumList.append(value)

for j in range(Number):
    if(NumList[j] % 2 == 0):
        Even_count = Even_count + 1
    else:
        Odd_count = Odd_count + 1

print("\nTotal Number of Even Numbers in this List =  ", Even_count)
print("Total Number of Odd Numbers in this List = ", Odd_count)

在這個 python 程序中，用戶輸入了列表元素= [2，3，5，7]，偶數計數= 0，奇數計數= 0

對於循環–第一次迭代:對於範圍(0，4)
中的 0，條件為真。因此，它進入 If 語句T5 If(NumList[0]% 2 = = 0)=>If(2% 2 = = 0)–條件為真
偶數 計數=偶數 計數+ 1 = > 0 + 1 = 1

第二次迭代:對於範圍(0，4)中的 1–條件為真
如果(NumList[1] % 2 == 0) = >如果(3% 2 = = 0)–條件為假
那麼，它進入 Else 塊。
奇數 計數=奇數 計數+ 1 = > 0 + 1 = 1

第三次迭代:對於範圍(0，4)中的 2–條件為真
如果(NumList[2] % 2 == 0) = >如果(5% 2 = = 0)–條件為假並進入否則塊。
奇數計數= 1 + 1 = 2

第四次迭代:對於範圍(0，4)中的 3–如果(7 % 2 == 0)條件為真【T0)–條件為假並進入否則塊。
奇數計數= 2 + 1 = 3

第五次迭代:對於範圍(4)中的 4–條件為假。因此，它從 For Loop 退出

這個計算偶數和奇數的 Python 程序與上面的相同。我們剛剛將 Python For Loop 替換為 While loop 。

NumList = []
Even_count = 0
Odd_count = 0
j = 0

Number = int(input("Please enter the Total Number of List Elements: "))
for i in range(1, Number + 1):
    value = int(input("Please enter the Value of %d Element : " %i))
    NumList.append(value)

while(j < Number):
    if(NumList[j] % 2 == 0):
        Even_count = Even_count + 1
    else:
        Odd_count = Odd_count + 1
    j = j + 1

print("\nTotal Number of Even Numbers in this List =  ", Even_count)
print("Total Number of Odd Numbers in this List = ", Odd_count)

Please enter the Total Number of List Elements: 5
Please enter the Value of 1 Element : 12
Please enter the Value of 2 Element : 13
Please enter the Value of 3 Element : 14
Please enter the Value of 4 Element : 15
Please enter the Value of 5 Element : 44

Total Number of Even Numbers in this List =   3
Total Number of Odd Numbers in this List =  2

這個計數偶數和奇數列表的程序與第一個例子相同。但是，我們使用函數來分離邏輯

def count_even(NumList):
    Even_count = 0
    for j in range(Number):
        if(NumList[j] % 2 == 0):
            Even_count = Even_count + 1
    return Even_count

def count_odd(NumList):
    Odd_count = 0
    for j in range(Number):
        if(NumList[j] % 2 != 0):
            Odd_count = Odd_count + 1
    return Odd_count

NumList = []
Number = int(input("Please enter the Total Number of List Elements: "))
for i in range(1, Number + 1):
    value = int(input("Please enter the Value of %d Element : " %i))
    NumList.append(value)

even_cnt = count_even(NumList)
odd_cnt = count_odd(NumList)
print("\nTotal Number of Even Numbers in this List =  ", even_cnt)
print("Total Number of Odd Numbers in this List = ", odd_cnt)

Please enter the Total Number of List Elements: 6
Please enter the Value of 1 Element : 12
Please enter the Value of 2 Element : 22
Please enter the Value of 3 Element : 33
Please enter the Value of 4 Element : 44
Please enter the Value of 5 Element : 55
Please enter the Value of 6 Element : 66

Total Number of Even Numbers in this List =   4
Total Number of Odd Numbers in this List =  2