二進(jìn)位也可以很有趣

1、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, 631二進(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, 632二進(jìn)位也可以很有趣 8, 9, 10, 11, 12, 13,

2、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, 633二進(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, 634二進(jìn)位也可以很有趣 2, 3, 6, 7, 10, 11, 14, 15,18, 19, 22, 23, 26, 27, 30, 31,3

3、4, 35, 38, 39, 42, 43, 46, 47,50, 51, 54, 55, 58, 59, 62, 635二進(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, 636二進(jìn)位也可以很有趣(原理) 1, 3, 5, 7, 0 0 0 0 0 1 = 1 9, 11, 13, 15, 0 0 0 0 1 0 = 217, 19, 21, 23, 0 0 0 0 1 1 = 3 25, 27

4、, 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 = 87二進(jìn)位也可以很有趣(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, 22, 23, 0 0 0 0 1 1 = 3 26, 27, 30, 31, 0 0 0 1 0 0 = 434, 35, 38, 3

5、9, 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 = 88二進(jìn)位也可以很有趣(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, 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

6、 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 = 89二進(jìn)位也可以很有趣(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 = 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

7、1 0 1 = 13 60, 61, 62, 63 0 0 1 1 1 0 = 1410二進(jìn)位也可以很有趣(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 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

8、0 1 1 1 = 2311二進(jìn)位也可以很有趣(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, 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 = 3912卡片玩法與原理 請玩者心裡想一個(gè)

9、0到63的整數(shù)不要告訴你(廢話), 然後你依第六張、 第五張、第四張 . 第一張拿給他, 請他告訴你上面有沒有他想的數(shù), 為了表示你是過目不忘, 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: 如果六張都沒有就是 0。 在每張給他之前看清楚第一個(gè)數(shù), 只要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)把答案告訴你了 ! 因每張紙上第一位數(shù)就是該位的比重(weight, 加權(quán))。13二進(jìn)位也可

10、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); 14二進(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+) if( k & (2的 i 次方) != 0) printf(%2d, , k); if(必要時(shí)) printf(n); printf(nnn); 15int yy = 1, 2, 4, 8, 16, 32; for( int i=0; i

11、 = 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16if(必要時(shí)) printf(n); int np = 0; /* numbers printed */ for(k=0; k = 63; k+) if( k & yyi != 0) printf(%2d, , k); np+; / number printed if( np%8 = 0) printf(n); 17if(

12、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) 18二進(jìn)位也可以很有趣完整程式 /* 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;

13、 /* 印出第 i 張卡片 */ printf(nnn); 19問題與思考 * 為什麼要依第六張(32開頭那張)、 第五張、 第四張 . 第一張拿給玩者? * 如果不用一個(gè)table (array) 來記住2的i 次方, 那要怎麼做? 用乘的 有何缺點(diǎn)? * 每張卡片最後一列也印了逗點(diǎn), 如何改進(jìn)? (hint: 加一列 if )20問題與思考 (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%

14、dn, a, a); 如果系統(tǒng)使用EBCDIC碼呢?21問題與思考 (ASCII code )#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 ); 22問題與思考 (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,

15、 x5=0 x6e; printf(=%s=n, x); 2324實(shí)數(shù)與準(zhǔn)確度(precision)#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=123

16、4567.250000ccbsd2:precision/ float 實(shí)數(shù)佔(zhàn)用 32 bits26double 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 = 1234567.200100After loo

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