{"id":830,"date":"2009-05-17T15:57:59","date_gmt":"2009-05-17T07:57:59","guid":{"rendered":"https:\/\/blue-sea-697d.quartiers047.workers.dev:443\/http\/coolshell.cn\/?p=830"},"modified":"2011-12-06T10:49:01","modified_gmt":"2011-12-06T02:49:01","slug":"%e8%af%ad%e8%a8%80%e7%9a%84%e6%ad%a7%e4%b9%89","status":"publish","type":"post","link":"https:\/\/blue-sea-697d.quartiers047.workers.dev:443\/https\/coolshell.cn\/articles\/830.html","title":{"rendered":"\u8bed\u8a00\u7684\u6b67\u4e49"},"content":{"rendered":"

\u8bed\u8a00\u662f\u4eba\u4e0e\u4eba\u76f8\u4e92\u6c9f\u901a\u7684\u9014\u5f84\uff0c\u800c\u8ba1\u7b97\u673a\u8bed\u8a00\u5219\u662f\u4eba\u548c\u8ba1\u7b97\u673a\u6c9f\u901a\u7684\u9014\u5f84\u3002\u5c31\u7b97\u662f\u4efb\u4f55\u518d\u5b8c\u7f8e\u7684\u81ea\u7136\u8bed\u8a00\u90fd\u4f1a\u6709\u6b67\u4e49\uff0c\u4f46\u662f\u53c8\u662f\u4ec0\u4e48\u8ba9\u4eba\u548c\u8ba1\u7b97\u8ba1\u7b97\u673a\u95f4\u4ea7\u751f\u4e86\u6b67\u4e49\u5462\uff1f
\n\u4e0b\u9762\u8fd9\u7bc7\u6587\u7ae0\u6765\u81eaGowri Kumar\u7684Puzzle C<\/a>\u4e00\u6587\u3002\u6211\u505a\u4e86\u4e00\u4e9b\u6574\u7406\uff0c\u6311\u9009\u4e86\u5176\u4e2d\u7684\u4e00\u4e9b\u95ee\u9898\uff0c\u5e76\u5728\u4e4b\u540e\u914d\u4e0a\u76f8\u5e94\u7684\u7b54\u6848(\u8fd9\u4e9b\u7b54\u6848\u662f\u6211\u52a0\u7684\uff0c\u5982\u679c\u9700\u8981\u539f\u7248\u7684\u7b54\u6848\u53ef\u4ee5\u76f4\u63a5\u548c\u672c\u6587\u4f5c\u8005Gowri Kumar\u8054\u7cfb\uff0c\u4f5c\u8005\u7684\u8054\u7cfb\u65b9\u5f0f\u53ef\u4ee5\u4ece\u8fd9\u91cc<\/a>\u5f97\u5230)\u3002<\/p>\n

puzzle 1<\/h3>\n

\u6b64\u6bb5\u7a0b\u5e8f\u7684\u4f5c\u8005\u5e0c\u671b\u8f93\u51fa\u6570\u7ec4\u4e2d\u7684\u6240\u6709\u5143\u7d20\uff0c\u4f46\u662f\u4ed6\u5374\u6ca1\u6709\u5f97\u5230\u4ed6\u60f3\u8981\u7684\u7ed3\u679c\uff0c\u662f\u4ec0\u4e48\u8ba9\u7a0b\u5e8f\u5458\u548c\u8ba1\u7b97\u673a\u4ea7\u751f\u6b67\u4e49\uff1f<\/p>\n

\r\n#include <stdio.h>\r\n#define TOTAL_ELEMENTS (sizeof(array) \/ sizeof(array[0]))\r\nint array[] = {23,34,12,17,204,99,16};\r\nint main()\r\n{\r\n    int d;\r\n\r\n    for(d=-1;d <= (TOTAL_ELEMENTS-2);d++)\r\n        printf("%d\\n",array[d+1]);\r\n\r\n    return 0;\r\n}\r\n<\/pre>\n
<\/p>\n
\u89e3\u7b54\uff1a<\/strong>
\n\u8fd0\u884c\u4e0a\u9762\u7684\u7a0b\u5e8f\uff0c\u7ed3\u679c\u662f\u4ec0\u4e48\u90fd\u6ca1\u6709\u8f93\u51fa\uff0c\u5bfc\u81f4\u8fd9\u4e2a\u7ed3\u679c\u7684\u539f\u56e0\u662fsizeof\u7684\u8fd4\u56de\u503c\u662f\u4e00\u4e2aunsinged int\uff0c\u4e3a\u6b64\u5728\u6bd4\u8f83int d \u548cTOTAL_ELEMENTS\u4e24\u4e2a\u503c\u90fd\u88ab\u8f6c\u6362\u6210\u4e86unsigned int\u6765\u8fdb\u884c\u6bd4\u8f83\uff0c\u8fd9\u6837\u5c31\u5bfc\u81f4-1\u88ab\u8f6c\u6362\u6210\u4e00\u4e2a\u975e\u5e38\u5927\u7684\u503c\uff0c\u4ee5\u81f3\u4e8efor\u5faa\u73af\u4e0d\u6ee1\u8db3\u6761\u4ef6\u3002\u56e0\u6b64\uff0c\u5982\u679c\u7a0b\u5e8f\u5458\u4e0d\u80fd\u7406\u89e3sizeof\u64cd\u4f5c\u7b26\u8fd4\u56de\u7684\u662f\u4e00\u4e2aunsigned int\u7684\u8bdd\uff0c\u5c31\u4f1a\u4ea7\u751f\u7c7b\u4f3c\u5982\u4e0a\u7684\u4eba\u673a\u6b67\u4e49\u3002<\/p>\n
puzzle 2<\/h3>\n
\u770b\u4e0a\u53bb\u975e\u5e38\u5b8c\u7f8e\u7684\u7a0b\u5e8f\uff0c\u662f\u4ec0\u4e48\u5bfc\u81f4\u4e86\u7f16\u7a0b\u7a0b\u5e8f\u4e0d\u901a\u8fc7\uff1f<\/p>\n
\r\n#include <stdio.h>\r\n\r\nvoid OS_Solaris_print()\r\n{\r\n    printf("Solaris - Sun Microsystems\\n");\r\n}\r\n\r\nvoid OS_Windows_print()\r\n{\r\n    printf("Windows - Microsoft\\n");\r\n}\r\n\r\nvoid OS_HP-UX_print()\r\n{\r\n    printf("HP-UX - Hewlett Packard\\n");\r\n}\r\n\r\nint main()\r\n{\r\n    int num;\r\n    printf("Enter the number (1-3):\\n");\r\n    scanf("%d",&num);\r\n\r\n    switch(num)\r\n    {\r\n        case 1:\r\n            OS_Solaris_print();\r\n            break;\r\n        case 2:\r\n            OS_Windows_print();\r\n            break;\r\n        case 3:\r\n            OS_HP-UX_print();\r\n            break;\r\n        default:\r\n            printf("Hmm! only 1-3 :-)\\n");\r\n        break;\r\n    }\r\n    return 0;\r\n}\r\n<\/pre>\n
\u89e3\u7b54\uff1a<\/strong>
\n\u7a0b\u5e8f\u5458\u8981\u4ee5\u8ba1\u7b97\u673a\u7684\u8bed\u8a00\u8fdb\u884c\u601d\u8003\uff0c\u4e0d\u4e0a\u4e0a\u9762\u90a3\u6bb5\u7a0b\u5e8f\u5bfc\u81f4\u7684\u7ed3\u679c\u4e0d\u6b62\u662f\u6b67\u4e49\u8fd9\u4e48\u7b80\u5355\uff0c\u800c\u76f4\u63a5\u7684\u7ed3\u679c\u662f\uff0c\u5bfc\u81f4\u8ba1\u7b97\u673a”\u542c\u4e0d\u61c2”\u4f60\u5728\u8bf4\u4ec0\u4e48\u3002\u5bfc\u81f4\u8ba1\u7b97\u673a\u542c\u4e0d\u61c2\u7684\u539f\u56e0\u662fHP-UX\u4e2d\u7684’-‘\u662f\u51cf\u53f7\uff1f\u8fd8\u662f\u5176\u4ed6\u4ec0\u4e48\uff1f<\/p>\n
puzzle 3<\/h3>\n
\u4e0b\u9762\u8fd9\u6bb5\u7a0b\u5e8f\u4f1a\u8f93\u51fa\u4ec0\u4e48\uff0c\u4e3a\u4ec0\u4e48\uff1f<\/p>\n
\r\nenum {false,true};\r\n\r\nint main()\r\n{\r\n    int i=1;\r\n    do\r\n    {\r\n        printf("%d\\n",i);\r\n        i++;\r\n\r\n        if(i < 15)\r\n            continue;\r\n    }while(false);\r\n\r\n    return 0;\r\n}\r\n<\/pre>\n
\u89e3\u7b54\uff1a<\/strong>
\n1\u523014\uff1f\u4e0d\u5bf9\uff0c\u7ed3\u679c\u662f1\uff0c\u56e0\u4e3acontinue\u7684\u542b\u4e49\u662f\u4e0d\u6267\u884c\u5faa\u73af\u4f53\u4e4b\u540e\u8bed\u4e49\uff0c\u800c\u76f4\u63a5\u5230\u5faa\u73af\u70b9\u3002\u660e\u663ewhile(false)\u4e0d\u5c5e\u4e8e\u5faa\u73af\u4f53\u3002\u5bfc\u81f4\u8fd9\u6bb5\u7a0b\u5e8f\u7684\u6b67\u4e49\u5c31\u662f\uff1a\u7a0b\u5e8f\u5458\u6ca1\u6709\u5b8c\u5168\u7406\u89e3\u8ba1\u7b97\u673a\u8bed\u8a00\u4e2dcontinue\u7684\u542b\u4e49\u3002<\/p>\n
puzzle 4<\/h3>\n
\u4e0b\u9762\u8fd9\u6bb5\u7a0b\u5e8f\u7684\u8f93\u51fa\u7ed3\u679c\u662f\uff1a<\/p>\n
\r\n#include <stdio.h>\r\n#define f(a,b) a##b\r\n#define g(a)   #a\r\n#define h(a) g(a)\r\n\r\nint main()\r\n{\r\n        printf("%s\\n", h(f(1,2)));\r\n        printf("%s\\n", g(f(1,2)));\r\n        return 0;\r\n}\r\n<\/pre>\n
\u5f53\u7136\uff0c\u4f60\u9996\u5148\u8981\u4e86\u89e3##\u548c#\u7684\u7528\u6cd5\uff0c\u5982\u679c\u4e0d\u61c2\u7684\u8bdd\uff0c\u672c\u9898\u4f60\u53ef\u4ee5\u76f4\u63a5\u8df3\u8fc7\u3002
\n\u89e3\u7b54\uff1a<\/strong>
\n\u770b\u5230\u8fd9\u6bb5\u7a0b\u5e8f\u4f60\u53ef\u80fd\u4f1a\u8ba4\u4e3a\uff0c\u8fd9\u4e24\u4e2aprintf\u8f93\u51fa\u7684\u540c\u4e00\u4e2a\u7ed3\u679c\uff0c\u53ef\u662f\u7b54\u6848\u5374\u975e\u5982\u6b64\uff0c\u672c\u9898\u7684\u8f93\u51fa\u662f12\u548cf(1,2)\uff0c\u4e3a\u4ec0\u4e48\u4f1a\u8fd9\u6837\u5462\uff1f\u56e0\u4e3a\u8fd9\u662f\u5b8f\uff0c\u5b8f\u7684\u89e3\u5f00\u4e0d\u8c61\u51fd\u6570\u6267\u884c\uff0c\u7531\u91cc\u5e26\u5916\u3002<\/p>\n
puzzle 5<\/h3>\n
\u4e0b\u9762\u8fd9\u6bb5\u7a0b\u5e8f\u7684\u8f93\u51fa\u662f\u4ec0\u4e48<\/p>\n
#include <stdio.h>
\nint main()
\n{
\nint a=10;
\nswitch(a)
\n{
\ncase ‘1’:
\nprintf(“ONE\\n”);
\nbreak;
\ncase ‘2’:
\nprintf(“TWO\\n”);
\nbreak;
\ndefau1t:
\nprintf(“NONE\\n”);
\n\uff5d
\nreturn 0;
\n}<\/p><\/blockquote>\n
\u89e3\u7b54\uff1a<\/strong>
\n\u672c\u9898\u6211\u6545\u610f\u5c06\u8bed\u6cd5\u654f\u611f\u63d2\u4ef6\u53bb\u6389\uff0c\u4e3a\u4e86\u5c31\u662f\u80fd\u5f97\u5230\u66f4\u597d\u7684\u6548\u679c\uff0c\u8fd9\u9053\u9898\u53c8\u662f\u4ec0\u4e48\u8ba9\u6b67\u4e49\u518d\u6b21\u53d1\u751f\uff0c\u5982\u679c\u4e0d\u4ed4\u7ec6\u4f60\u53ef\u80fd\u6c38\u8fdc\u90fd\u627e\u4e0d\u5230\u7b54\u6848\uff0c\u5982\u679c\u771f\u5230\u7684\u5230\u4e86\u90a3\u4e2a\u65f6\u5019\uff0c\u4f60\u662f\u5426\u4f1a\u56e0\u4e3a\u5bf9default\u8bed\u4e49\u7684\u6000\u7591\uff0c\u800c\u4e0d\u6562\u518d\u4f7f\u7528default\uff1f\u672c\u9898\u7684\u6b67\u4e49\u70b9\u5c31\u662fdefault\uff0c\u770b\u597d\u4e86\u662fdefau1t\u800c\u4e0d\u662fdefault\uff0c\u4e0d\u662f\u5173\u952e\u5b57\uff01\u4e3a\u4ec0\u4e48\u8ba1\u7b97\u80fd”\u542c\u61c2”\u8fd9\u6837\u7684defau1t\uff0c\u7b97\u7136\u5b83\u542c\u61c2\u4e86\uff0c\u4f46\u5b83\u7684\u7406\u89e3\u5374\u662f\u6807\u53f7”defau1t”<\/p>\n
puzzle 6<\/h3>\n
\u4e0b\u9762\u8fd9\u6bb5\u7a0b\u5e8f\u7684\u8f93\u51fa\u4ec0\u4e48\uff1f<\/p>\n
\r\n#include <stdio.h>\r\n\r\nint main()\r\n{\r\n    float f=0.0f;\r\n    int i;\r\n\r\n    for(i=0;i<10;i++)\r\n        f = f + 0.1f;\r\n\r\n    if(f == 1.0f)\r\n        printf("f is 1.0 \\n");\r\n    else\r\n        printf("f is NOT 1.0 \\n");\r\n\r\n    return 0;\r\n}\r\n<\/pre>\n
\u89e3\u7b54\uff1a<\/strong>
\n\u4f60\u662f\u5426\u4f3c\u66fe\u76f8\u8bc6\uff1f\u4e0d\u9519\u8fd9\u4e2a\u95ee\u9898\u5728\u9177\u58f3\u4e4b\u524d\u7684\u535a\u6587\u300a\u4f60\u80fd\u505a\u5bf9\u4e0b\u9762\u8fd9\u4e9bJavaScript\u7684\u9898\u5417\uff1f<\/a>\u300b\u4e2d\u66fe\u4eca\u63d0\u5230\u8fc7\uff0c\u4e0d\u8981\u8ba9\u4e24\u4e2a\u6d6e\u70b9\u6570\u76f8\u6bd4\u8f83\u3002\u6240\u4ee5\u672c\u9898\u7684\u7b54\u6848\u662f”f is NOT 1.0″\uff0c\u5982\u679c\u4f60\u771f\u60f3\u6bd4\u8f83\u4e24\u4e2a\u6d6e\u70b9\u6570\u65f6\uff0c\u4f60\u5e94\u8be5\u6309\u4e00\u5b9a\u7cbe\u5ea6\u6765\u6bd4\u8f83\uff0c\u6bd4\u5982\u4f60\u4e00\u5b9a\u8981\u5728\u672c\u9898\u4e2d\u505a\u6bd4\u8f83\u90a3\u4e48\u4f60\u5e94\u8be5\u8fd9\u4e48\u505aif( (f – 1.0f)<0.1 )<\/p>\n
puzzle 7<\/h3>\n
\u4e0b\u9762\u4e24\u4e2a\u51fd\u6570\u662f\u5426\u5177\u6709\u76f8\u540c\u7684\u539f\u578b\uff1f<\/p>\n
\r\nint foobar(void);\r\nint foobar();\r\n<\/pre>\n
\u4e0b\u9762\u8fd9\u4e24\u6bb5\u7a0b\u5e8f\u5c06\u4f1a\u5e2e\u4f60\u627e\u5230\u4e0a\u9898\u7684\u7b54\u6848
\n\u7a0b\u5e8f1<\/p>\n
\r\n#include <stdio.h>\r\nvoid foobar1(void)\r\n{\r\n    printf("In foobar1\\n");\r\n}\r\n\r\nvoid foobar2()\r\n{\r\n    printf("In foobar2\\n");\r\n}\r\n\r\nint main()\r\n{\r\n    char ch = 'a';\r\n\r\n    foobar1();\r\n    foobar2(33, ch);\r\n\r\n     return 0;\r\n}\r\n<\/pre>\n
\u7a0b\u5e8f2<\/p>\n
\r\n#include "stdio.h"\r\nvoid foobar1(void)\r\n{\r\n    printf("In foobar1\\n");\r\n}\r\n\r\nvoid foobar2()\r\n{\r\n    printf("In foobar2\\n");\r\n}\r\n\r\nint main()\r\n{\r\n    char ch = 'a';\r\n\r\n    foobar1(33,ch);\r\n    foobar2();\r\n\r\n    return 0;\r\n}\r\n<\/pre>\n
\u89e3\u7b54<\/strong>
\n\u7a0b\u5e8f\u7247\u6bb5\u4e00\uff0c\u6ca1\u6709\u95ee\u9898\uff0c\u7a0b\u5e8f\u7247\u6bb5\u4e8c\u7f16\u8bd1\u62a5\u9519\uff0c\u8fd9\u4e24\u4e2a\u7a0b\u5e8f\u544a\u8bc9\u6211\u4eec\uff0cfoobar1(void)\u548cfoobar2()\u662f\u6709\u4e0d\u540c\u539f\u578b\u7684\u7684\u3002\u6211\u4eec\u53ef\u4ee5\u5728\u300aISO\/IEC 9899\u300b\u7684C\u8bed\u8a00\u89c4\u8303\u627e\u5230\u4e0b\u9762\u4e24\u6bb5\u5173\u4e8e\u51fd\u6570\u58f0\u660e\u7684\u63cf\u8ff0<\/p>\n
10.The special case of an unnamed parameter of type void as the only item in the list specifies that the function has no parameters<\/p><\/blockquote>\n
14.An identifier list declares only the identifiers of the parameters of the function. An empty list in a function declarator that is part of a definition of that function specifies that the function has no parameters. The empty list in a function declarator that is not part of a definition of that function specifies that no information about the number or types of the parameters is supplied.124)<\/p><\/blockquote>\n
\u4e0a\u9762\u4e24\u6bb5\u8bdd\u7684\u610f\u601d\u5c31\u662f\uff1afoobar1(void)\u662f\u6ca1\u6709\u53c2\u6570\uff0c\u800cfoobar1()\u7b49\u4e8eforbar1(…)\u7b49\u4e8e\u53c2\u6570\u7c7b\u578b\u672a\u77e5\u3002<\/p>\n
\u603b\u7ed3<\/strong>
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