# _*_ coding: utf-8 _*_

# 迴圈(while & for) 練習

# By Eosin Chen([email protected])

import random

# while 基本型

def while_basic():

random_count = random.randint(1, 6)

print(random_count)

# while random_count != 6: <= 判斷式上，加上括號比較好

while (random_count != 6):

random_count = random.randint(1, 6)

print(random_count)

# 依照輸入的值來執行 while 次數

def while_input():

while_count = 0 #用來記錄迴圈執行次數

# 這兒有資料型態轉換 => int(...)

input_count = int(input("請輸入迴圈執行次數："))

print(input_count)

while (while_count < input_count):

while_count += 1 # while_count = while_count + 1

print("目前執行到第 " + str(while_count) + " 次")

# ------------------------------------------------------------------------------

# for 迴圈 - 以 range 為範圍來執行

def for_range():

# range(start, stop, step) <= start 到 stop-1, 以 step 為遞增值(若無內定為 1)

for var in range(1, 6):

print(var)

# for 迴圈 - 從資料結構中(變數)，取出值來執行

def for_string():

myEngString = "My First String"

myChnString = "我的中文字串"

for char in myChnString:

print(char)

# for 迴圈 - 從資料結構中(串列)，取出值來執行

def for_list():

myList = [1, 3, 5, 7, 9, "A", "String"]

for char in myList:

print(char)

# for 迴圈 - 巢狀，九九乘法表

def for_nested():

for i in range(2, 7, 4):

for j in range(1, 10):

# -----

print("{}x{}={:>2} ".format(i, j, i * j), end="")

print("{}x{}={:>2} ".format(i + 1, j, (i + 1) * j), end="")

print("{}x{}={:>2} ".format(i + 2, j, (i + 2) * j), end="")

print("{}x{}={:>2} ".format(i + 3, j, (i + 3) * j))

#-----

#-----

#for k in range(i, i + 5):

# print("{}x{}={:>2} ".format(k, j, k * j), end="")

#print()

#-----

print()

# continue - for 迴圈 - 巢狀，九九乘法表

def for_nested_continue():

for i in range(2, 9):

if i != 2 and i != 6: continue

for j in range(1, 10):

for k in range(i, i + 5):

print("{}x{}={:>2} ".format(k, j, k * j), end="")

print()

print()

# break - while - random

def while_basic_break():

while True:

x = random.randint(1, 6)

print(x)

if x == 6: break

# 費氏函數 - loop 版

def fib_loop(n):

# 用來存放最終值

sum_final = 1

# 用來存放前一個的值

sum_prev_1 = 0

# 數值移動時，暫存之用

sum_temp = 0

# 進行 n < 0, n == 0, n == 1 的處理

if (n < 0):

print("請輸入 0 以上的整數")

return

if (n == 0) or (n == 1):

return n

# 利用迴圈進行數值運算

for i in range(2, n + 1):

sum_temp = sum_final

sum_final = sum_final + sum_prev_1

sum_prev_1 = sum_temp

# 顯示每一個階段的結果，以便除錯

# 正式程式中，此行需移除

print(str(i) + " => " +str(sum_final) + ", " + str(sum_prev_1) + ", " + str(sum_temp))

return sum_final

# 主程式

#while_basic()

#while_input()

#for_range()

#for_string()

#for_list()

#for_nested()

#for_nested_continue()

#while_basic_break()

fib_loop(100)