二進(jìn)位也可以很有趣ppt課件

1、二進(jìn)位也可以很有趣二進(jìn)位也可以很有趣32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,48, 49, 50, 51, 52, 53, 54, 55,56, 57, 58, 59, 60, 61, 62, 63二進(jìn)位也可以很有趣二進(jìn)位也可以很有趣16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,48, 49, 50, 51, 52, 53, 54, 55,56, 57, 58, 59, 60, 61, 62, 63二進(jìn)位也可以很有趣二進(jìn)位也可以很

2、有趣 8, 9, 10, 11, 12, 13, 14, 15, 24, 25, 26, 27, 28, 29, 30, 31,40, 41, 42, 43, 44, 45, 46, 47,56, 57, 58, 59, 60, 61, 62, 63二進(jìn)位也可以很有趣二進(jìn)位也可以很有趣 4, 5, 6, 7, 12, 13, 14, 15,20, 21, 22, 23, 28, 29, 30, 31,36, 37, 38, 39, 44, 45, 46, 47,52, 53, 54, 55, 60, 61, 62, 63二進(jìn)位也可以很有趣二進(jìn)位也可以很有趣 2, 3, 6, 7, 10, 11

3、, 14, 15,18, 19, 22, 23, 26, 27, 30, 31,34, 35, 38, 39, 42, 43, 46, 47,50, 51, 54, 55, 58, 59, 62, 63二進(jìn)位也可以很有趣二進(jìn)位也可以很有趣 1, 3, 5, 7, 9, 11, 13, 15,17, 19, 21, 23, 25, 27, 29, 31,33, 35, 37, 39, 41, 43, 45, 47,49, 51, 53, 55, 57, 59, 61, 63二進(jìn)位也可以很有趣二進(jìn)位也可以很有趣(原理原理) 1, 3, 5, 7, 0 0 0 0 0 1 = 1 9, 11, 13

4、, 15, 0 0 0 0 1 0 = 217, 19, 21, 23, 0 0 0 0 1 1 = 3 25, 27, 29, 31, 0 0 0 1 0 0 = 433, 35, 37, 39, 0 0 0 1 0 1 = 5 41, 43, 45, 47, 0 0 0 1 1 0 = 649, 51, 53, 55, 0 0 0 1 1 1 = 7 57, 59, 61, 63 0 0 1 0 0 0 = 8二進(jìn)位也可以很有趣二進(jìn)位也可以很有趣(原理原理) 2, 3, 6, 7, 0 0 0 0 0 1 = 1 10, 11, 14, 15, 0 0 0 0 1 0 = 218, 19,

5、 22, 23, 0 0 0 0 1 1 = 3 26, 27, 30, 31, 0 0 0 1 0 0 = 434, 35, 38, 39, 0 0 0 1 0 1 = 5 42, 43, 46, 47, 0 0 0 1 1 0 = 650, 51, 54, 55, 0 0 0 1 1 1 = 7 58, 59, 62, 63 0 0 1 0 0 0 = 8二進(jìn)位也可以很有趣二進(jìn)位也可以很有趣(原理原理) 4, 5, 6, 7, 0 0 0 0 0 1 = 1 12, 13, 14, 15, 0 0 0 0 1 0 = 220, 21, 22, 23, 0 0 0 0 1 1 = 3 28,

6、 29, 30, 31, 0 0 0 1 0 0 = 436, 37, 38, 39, 0 0 0 1 0 1 = 5 44, 45, 46, 47, 0 0 0 1 1 0 = 652, 53, 54, 55, 0 0 0 1 1 1 = 7 60, 61, 62, 63 0 0 1 0 0 0 = 8二進(jìn)位也可以很有趣二進(jìn)位也可以很有趣(原理原理) 8, 9, 10, 11, 0 0 0 1 1 1 = 7 12, 13, 14, 15, 0 0 1 0 0 0 = 824, 25, 26, 27, 0 0 1 0 0 1 = 928, 29, 30, 31, 0 0 1 0 1 0 =

7、1040, 41, 42, 43, 0 0 1 0 1 1 = 11 44, 45, 46, 47, 0 0 1 1 0 0 = 1256, 57, 58, 59, 0 0 1 1 0 1 = 13 60, 61, 62, 63 0 0 1 1 1 0 = 14二進(jìn)位也可以很有趣二進(jìn)位也可以很有趣(原理原理)16, 17, 18, 19, 0 1 0 0 0 0 = 1620, 21, 22, 23, 0 1 0 0 0 1 = 1724, 25, 26, 27, 0 1 0 0 1 0 = 1828, 29, 30, 31, 0 1 0 0 1 1 = 1948, 49, 50, 51, 0

8、 1 0 1 0 0 = 2052, 53, 54, 55, 0 1 0 1 0 1 = 2156, 57, 58, 59, 0 1 0 1 1 0 = 2260, 61, 62, 63 0 1 0 1 1 1 = 23二進(jìn)位也可以很有趣二進(jìn)位也可以很有趣(原理原理)32, 33, 34, 35, 1 0 0 0 0 0 = 3236, 37, 38, 39, 1 0 0 0 0 1 = 3340, 41, 42, 43, 1 0 0 0 1 0 = 3444, 45, 46, 47, 1 0 0 0 1 1 = 3548, 49, 50, 51, 1 0 0 1 0 0 = 3652, 53

9、, 54, 55, 1 0 0 1 0 1 = 3756, 57, 58, 59, 1 0 0 1 1 0 = 3860, 61, 62, 63 1 0 0 1 1 1 = 39卡片玩法與原理 請玩者心裡想一個(gè)0到63的整數(shù)不要告訴他(廢話), 然後他依第六張、 第五張、第四張 . 第一張拿給他, 請他告訴他上面有沒有他想的數(shù), 為了表示他是過目不忘, 交給他之前假裝看一看, 交給他後不要立刻 拿回來, 只請他分別放不同手中作為證據(jù)。 答案: 假設(shè)六張都沒有就是 0。 在每張給他之前看清楚第一個(gè)數(shù), 只需他說有就加到答案中, 等到 最後一張給他, 等他說出有沒有後, 答案也出來了。 原理: 其

10、實(shí)每張紙都是代表一個(gè)二進(jìn)位數(shù) (binary number)。 有就是 1, 沒有就是 0。 與上一遊戲一樣, 他已經(jīng)把答案告訴他了 ! 因每張紙上第一位數(shù)就是該位的比重(weight, 加權(quán))。二進(jìn)位也可以很有趣二進(jìn)位也可以很有趣 /* 寫程式印出前述之六張卡片 */ for( int i=0; i = 5; i+) printf(二進(jìn)位也可以很有趣nn ); /* 印出第 i 張卡片 */ printf(nnn); 二進(jìn)位也可以很有趣二進(jìn)位也可以很有趣 for( int i=0; i = 5; i+) printf(二進(jìn)位也可以很有趣nn ); for(k=0; k = 63; k+) i

11、f( k & (2的 i 次方) != 0) printf(%2d, , k); if(必要時(shí)) printf(n); printf(nnn); int yy = 1, 2, 4, 8, 16, 32; for( int i=0; i = 5; i+) printf(二進(jìn)位也可以很有趣nn ); for(k=0; k = 63; k+) if( k & yyi != 0) printf(%2d, , k); if(必要時(shí)) printf(n); printf(nnn); 用一個(gè)陣列記住 2的 i 次方if(必要時(shí)) printf(n); int np = 0; /* numbe

12、rs printed */ for(k=0; k = 63; k+) if( k & yyi != 0) printf(%2d, , k); np+; / number printed if( np%8 = 0) printf(n); if(必要時(shí)) printf(n); int np = 0; for(k=0; k = 63; k+) if( k & yyi != 0) printf(%2d, , k); / np+; / number printed if( (+np)%8 = 0) printf(n); / 每印完八個(gè)數(shù)就換列 (new line) 二進(jìn)位也可以很有趣完好

13、程式二進(jìn)位也可以很有趣完好程式 /* 寫程式印出前述之六張卡片 */#includeint yy = 1, 2, 4, 8, 16, 32;int k, np;main( ) for( int i=0; i = 5; i+) printf(二進(jìn)位也可以很有趣nn ); np=0; /* 印出第 i 張卡片 */ printf(nnn); 問題與思索 * * 為什麼要依第六張為什麼要依第六張(32(32開頭那張開頭那張) )、 第五張、第五張、 第四張第四張 . . 第一張拿給玩者第一張拿給玩者? ? * * 假設(shè)不用一個(gè)假設(shè)不用一個(gè)table (array) table (array) 來記住

14、來記住2 2的的i i 次方次方, , 那要怎麼做那要怎麼做? ? 用乘的用乘的 有何缺點(diǎn)有何缺點(diǎn)? ? * * 每張卡片最後一列也印了逗點(diǎn)每張卡片最後一列也印了逗點(diǎn), , 如何改進(jìn)如何改進(jìn)? (hint: ? (hint: 加一列加一列 if )if )問題與思索 (ASCII code )#includemain( ) printf( %c 的 ASCII code是%dn, 0, 0); printf( %c 的 ASCII code是%dn, A, A); printf( %c 的 ASCII code是%dn, a, a); 假設(shè)系統(tǒng)運(yùn)用EBCDIC碼呢?問題與思索 (ASCII c

15、ode )#includemain( ) int i, k=0; for(i=65; i=122; +i) printf( %c 的 ASCII code, i); printf( 是%d, i); +k; printf(k%3=0? n : t); printf(n ); 問題與思索 (中文碼?)#includeunsigned char x9 = 0 ;main( ) int m = 0 xa4, n=0 x6a; x0 = m; x1=n; x2 = 0 xae, x3=97; x4 = 0 xa6, x5=0 x6e; printf(=%s=n, x); 實(shí)數(shù)與準(zhǔn)確度(precisio

16、n)#includefloat x, xdelta; int i; /*precision.c */main( ) double y; x = 1234567.2, xdelta = 0.0001; printf(Before loop, x=%fn, x); for(i=1; i gcc precision.cccbsd2:precision/ ./a.outBefore loop, x=1234567.250000first y = 1234567.250100After loop, x=1234567.250000ccbsd2:precision/ float 實(shí)數(shù)佔(zhàn)用 32 bitsd

17、ouble 實(shí)數(shù)準(zhǔn)確度#includedouble x, xdelta; int i; /*precdbl.c */main( ) double y; x = 1234567.2, xdelta = 0.0001; printf(Before loop, x=%fn, x); for(i=1; i gcc precdbl.cccbsd2:precision/ ./a.outBefore loop, x=1234567.200000first y = 1234567.201900After loop, x=1234568.000001ccbsd2:precision/ double 實(shí)數(shù)佔(zhàn)用 6

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