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                ## 函數應用:打印圖形和數學計算 ### 目標 * 感受函數的嵌套調用 * 感受程序設計的思路,復雜問題分解為簡單問題 ### 思考&實現1 1. 寫一個函數打印一條橫線 2. 打印自定義行數的橫線 ### 參考代碼1 ~~~ # 打印一條橫線 def printOneLine(): print("-"*30) # 打印多條橫線 def printNumLine(num): i=0 # 因為printOneLine函數已經完成了打印橫線的功能, # 只需要多次調用此函數即可 while i<num: printOneLine() i+=1 printNumLine(3) ~~~ ### 思考&實現2 1. 寫一個函數求三個數的和 2. 寫一個函數求三個數的平均值 ### 參考代碼2 ~~~ # 求3個數的和 def sum3Number(a,b,c): return a+b+c # return 的后面可以是數值,也可是一個表達式 # 完成對3個數求平均值 def average3Number(a,b,c): # 因為sum3Number函數已經完成了3個數的就和,所以只需調用即可 # 即把接收到的3個數,當做實參傳遞即可 sumResult = sum3Number(a,b,c) aveResult = sumResult/3.0 return aveResult # 調用函數,完成對3個數求平均值 result = average3Number(11,2,55) print("average is %d"%result) ~~~
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