計概的一些問題請進

1. In the ASCII code, what is the relationship between the codes for an uppercase letter and the same letter in lowercase?

2Encode these sentences in ASCII:

a Where are you?

c 2 + 3 = 5

3 what is the largest numeric value that could be represented with three bytes if each digit were encoded using one ASCII pattern per byte? What if binary notation were used?

4What is an advantage of representing images via vector techniques as opposed to bit map techniques? What about bit map techniques as opposed to vector techniques?

5 Convert each of the following binary representations to its equivalent base ten form

a 11.0 b 101.111 c 100.1 d 110.011 e 0.101

6Express the following values in binary notaion:

a 4又1/2 b 2又3/4 c 1又1/8 d 5/16 e5又5/8

1 個解答

• 1 0 年前
最佳解答

ASCII, American Standard Code for Information Interchange 念起來像是 "阿斯key"，定義從 0 到 127 的一百二十八個數字所代表的英文字母或數字或符號，所有使用 ASCII 的電腦之間可以互相讀取同一份文件而不會有不一樣的結果與意義。由於只使用 7 個位元 (bit) 就可以表示從 0 到 127 的數字，大部分的電腦都使用 8 個位元來存取字元集 (character set)，這就是早期是8位元電腦之意。

維基百科有ASCII的說明 : http://zh.wikipedia.org/wiki/Ascii%E3%80%82%E6%88%...

1. In the ASCII code, what is the relationship between the codes for an uppercase letter and the same letter in lowercase? 在ASCII碼裡，大寫的code與小寫的code間的關係 ? (想法 : ASCII碼A-Z 與a-z是順序列出的，把圖形A & a各別的ASCII碼找出來，他們之間的差異自然可比出來)

2. Encode these sentences in ASCII 用ASCII碼寫出下列句子 ? (想法：知道各字母與符合的ASCII碼吧? 逐字拼就可以出來了)

3. what is the largest numeric value that could be represented with three bytes if each digit were encoded using one ASCII pattern per byte? What if binary notation were used? 如果每個數碼被編碼成每位元一個ASCII圖形，請問可以用三個位元字呈現的最大數值為何 ? 那用二進位呢 ?(不是很清楚，但我猜想是三位數最大的999用ASCII碼的表示值，另外以二進位法的表現值。)

4. 4What is an advantage of representing images via vector techniques as opposed to bit map techniques? What about bit map techniques as opposed to vector techniques? 這裡是談image影像。bit map是點陣圖， vector techniques 應該指向量圖。題目就是各自與對方的優缺點了。

5. Convert each of the following binary representations to its equivalent base ten form 就是將下列各題的二進位ASCII碼轉成十進位ASCII碼，這時就要把二進位裡分小數點以上與小數點以下分別轉十進位來算

6. Express the following values in binary notaion 就是用二進位法來回答下列各題的結果 : (ex. a. 4又1/2在十進位就是4.25，這時用二進位就要把十進位裡分小數點以上與小數點以下來算。)

5,6兩題網路上有教學法請參考 : http://web.ncyu.edu.tw/~kocc/File/Introduction to Computers (3).ppt )

參考資料： 網路資料+自已想的