<jupyter_start><jupyter_text>**[18に同じ数を足して引いたら、どんな値になる？(Python 3.6版)]**下記資料のスライド＃26のCで記述された版を改変[配信講義　計算科学技術特論A (2019) (4月11日～7月25日)](https://www.r-ccs.riken.jp/library/event/tokuronA_2019.html)[第6回 5月23日 線形代数演算ライブラリBLASとLAPACKの基礎と実践１ 中田真秀（理研）](https://www.r-ccs.riken.jp/wp-content/uploads/2019/05/nakata190523.pdf)<jupyter_code>### 「18.0」は浮動小数点数としての表記
###  「18」と整数表記に変えてみたり、「15.0」等の別の浮動小数点数に変えて実行してみましょう。

a=18.0
for i in range(45,65):
    b = 2**i #--- 「b」に、2の累乗（45乗から64乗まで）を順に入れていく
    c = (a+b)-b #--- 「c」に、(a+b)-bの計算結果を入れる。
    print ("a=",a,",  b = 2^",i," --> (a+b) -b = ",c," --- (a == (a+b)-b) = ",a==c)
    # 「a」の値、「b」の値、「(a+b)-b」の計算結果（=「c」の値）、「a」の値と「c」の値が同じかどうか判定を表示<jupyter_output>a= 18.0 ,  b = 2^ 45  --> (a+b) -b =  18.0  --- (a == (a+b)-b) =  True
a= 18.0 ,  b = 2^ 46  --> (a+b) -b =  18.0  --- (a == (a+b)-b) =  True
a= 18.0 ,  b = 2^ 47  --> (a+b) -b =  18.0  --- (a == (a+b)-b) =  True
a= 18.0 ,  b = 2^ 48  --> (a+b) -b =  18.0  --- (a == (a+b)-b) =  True
a= 18.0 ,  b = 2^ 49  --> (a+b) -b =  18.0  --- (a == (a+b)-b) =  True
a= 18.0 ,  b = 2^ 50  --> (a+b) -b =  18.0  --- (a == (a+b)-b) =  True
a= 18.0 ,  b = 2^ 51  --> (a+b) -b =  18.0  --- (a == (a+b)-b) =  True
a= 18.0 ,  b = 2^ 52  --> (a+b) -b =  18.0  --- (a == (a+b)-b) =  True
a= 18.0 ,  b = 2^ 53  --> (a+b) -b =  18.0  --- (a == (a+b)-b) =  True
a= 18.0 ,  b = 2^ 54  --> (a+b) -b =  16.0  --- (a == (a+b)-b) =  False
a= 18.0 ,  b = 2^ 55  --> (a+b) -b =  16.0  --- (a == (a+b)-b) =  False
a= 18.0 ,  b = 2^ 56  --> (a+b) -b =  16.0  --- (a == (a+b)-b) =  False
a= 18.0 ,  b = 2^ 57  --> (a+b) -b =  32.0  --- (a == (a+b)-b) =  False
a= 18.0 ,  b = 2^ 58  --> (a+b) -b =  0.0  --- (a == (a+b)-b) =  False
a=[...]
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