{"id":173,"date":"2009-07-12T14:36:00","date_gmt":"2009-07-12T06:36:00","guid":{"rendered":"http:\/\/gsakd878.wordpress.com\/2009\/07\/12\/%e9%ab%98%e8%b4%a8%e9%87%8fc%e6%95%99%e7%a8%8b-%e7%ac%ac4%e7%ab%a0-%e8%a1%a8%e8%be%be%e5%bc%8f%e5%92%8c%e5%9f%ba%e6%9c%ac%e8%af%ad%e5%8f%a5"},"modified":"2009-07-12T14:36:00","modified_gmt":"2009-07-12T06:36:00","slug":"%e9%ab%98%e8%b4%a8%e9%87%8fc%e6%95%99%e7%a8%8b-%e7%ac%ac4%e7%ab%a0-%e8%a1%a8%e8%be%be%e5%bc%8f%e5%92%8c%e5%9f%ba%e6%9c%ac%e8%af%ad%e5%8f%a5","status":"publish","type":"post","link":"https:\/\/www.keyboardmeow.com\/?p=173","title":{"rendered":"\u9ad8\u8d28\u91cfC++\u6559\u7a0b — \u7b2c4\u7ae0 \u8868\u8fbe\u5f0f\u548c\u57fa\u672c\u8bed\u53e5"},"content":{"rendered":"
\u9ad8\u8d28\u91cfC++\u6559\u7a0b -- \u7b2c4\u7ae0 \u8868\u8fbe\u5f0f\u548c\u57fa\u672c\u8bed\u53e5<\/span><\/div>\n
\n\u6765\u6e90:www.vcworld.net<\/font><\/a>\u3000<\/div>\n
\n

\u8bfb\u8005\u53ef\u80fd\u6000\u7591\uff1a\u8fdeif\u3001for\u3001while\u3001goto\u3001switch\u8fd9\u6837\u7b80\u5355\u7684\u4e1c\u897f\u4e5f\u8981\u63a2\u8ba8\u7f16\u7a0b\u98ce\u683c\uff0c\u662f\u4e0d\u662f\u5c0f\u9898\u5927\u505a\uff1f<\/span><\/p>\n

\u6211\u771f\u7684\u53d1\u89c9\u5f88\u591a\u7a0b\u5e8f\u5458\u7528\u9690\u542b\u9519\u8bef\u7684\u65b9\u5f0f\u5199\u8868\u8fbe\u5f0f\u548c\u57fa\u672c\u8bed\u53e5\uff0c\u6211\u81ea\u5df1\u4e5f\u72af\u8fc7\u7c7b\u4f3c\u7684\u9519\u8bef\u3002<\/p>\n

\n\u8868\u8fbe\u5f0f\u548c\u8bed\u53e5\u90fd\u5c5e\u4e8eC++\/C\u7684\u77ed\u8bed\u7ed3\u6784\u8bed\u6cd5\u3002\u5b83\u4eec\u770b\u4f3c\u7b80\u5355\uff0c\u4f46\u4f7f\u7528\u65f6\u9690\u60a3\u6bd4\u8f83\u591a\u3002\u672c\u7ae0\u5f52\u7eb3\u4e86\u6b63\u786e\u4f7f\u7528\u8868\u8fbe\u5f0f\u548c\u8bed\u53e5\u7684\u4e00\u4e9b\u89c4\u5219\u4e0e\u5efa\u8bae\u3002<\/p>\n

\u00a0<\/p>\n

4.1 \u8fd0\u7b97\u7b26\u7684\u4f18\u5148\u7ea7<\/font><\/strong><\/p>\n

C++\/C\u8bed\u8a00\u7684\u8fd0\u7b97\u7b26\u6709\u6570\u5341\u4e2a\uff0c\u8fd0\u7b97\u7b26\u7684\u4f18\u5148\u7ea7\u4e0e\u7ed3\u5408\u5f8b\u5982\u88684-1\u6240\u793a\u3002\u6ce8\u610f\u4e00\u5143\u8fd0\u7b97\u7b26 + - *
\n\u7684\u4f18\u5148\u7ea7\u9ad8\u4e8e\u5bf9\u5e94\u7684\u4e8c\u5143\u8fd0\u7b97\u7b26\u3002<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u4f18\u5148\u7ea7<\/td>\n\u8fd0\u7b97\u7b26<\/td>\n\u7ed3\u5408\u5f8b<\/td>\n<\/tr>\n
\n

\u4ece<\/p>\n

\u00a0<\/p>\n

\u9ad8<\/p>\n

\u00a0<\/p>\n

\u5230<\/p>\n

\u00a0<\/p>\n

\u4f4e<\/p>\n

\u00a0<\/p>\n

\u6392<\/p>\n

\u00a0<\/p>\n

\u5217<\/p>\n<\/td>\n

( ) [ ] -> .<\/td>\n\u4ece\u5de6\u81f3\u53f3<\/td>\n<\/tr>\n
\n

! ~ ++ -- \uff08\u7c7b\u578b\uff09 sizeof
\n+ - * &<\/p>\n<\/td>\n

\u4ece\u53f3\u81f3\u5de6<\/td>\n<\/tr>\n
* \/ %<\/td>\n\u4ece\u5de6\u81f3\u53f3<\/td>\n<\/tr>\n
+ -<\/td>\n\u4ece\u5de6\u81f3\u53f3<\/td>\n<\/tr>\n
<<
\n>><\/td>\n		\u4ece\u5de6\u81f3\u53f3<\/td>\n<\/tr>\n
< <= >
\n>=<\/td>\n		\u4ece\u5de6\u81f3\u53f3<\/td>\n<\/tr>\n
== !=<\/td>\n\u4ece\u5de6\u81f3\u53f3<\/td>\n<\/tr>\n
&<\/td>\n\u4ece\u5de6\u81f3\u53f3<\/td>\n<\/tr>\n
^<\/td>\n\u4ece\u5de6\u81f3\u53f3<\/td>\n<\/tr>\n
|<\/td>\n\u4ece\u5de6\u81f3\u53f3<\/td>\n<\/tr>\n
&&<\/td>\n\u4ece\u5de6\u81f3\u53f3<\/td>\n<\/tr>\n
||<\/td>\n\u4ece\u53f3\u81f3\u5de6<\/td>\n<\/tr>\n
?:<\/td>\n\u4ece\u53f3\u81f3\u5de6<\/td>\n<\/tr>\n
\n

= += -= *= \/= %= &= ^=
\n|= <<=
\n>>=<\/p>\n<\/td>\n

\u4ece\u5de6\u81f3\u53f3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u88684-1 \u8fd0\u7b97\u7b26\u7684\u4f18\u5148\u7ea7\u4e0e\u7ed3\u5408\u5f8b<\/p>\n

\u00a0<\/p>\n

\u25cf\u3010\u89c4\u52194-1-1\u3011\u5982\u679c\u4ee3\u7801\u884c\u4e2d\u7684\u8fd0\u7b97\u7b26\u6bd4\u8f83\u591a\uff0c\u7528\u62ec\u53f7\u786e\u5b9a\u8868\u8fbe\u5f0f\u7684\u64cd\u4f5c\u987a\u5e8f\uff0c\u907f\u514d\u4f7f\u7528\u9ed8\u8ba4\u7684\u4f18\u5148\u7ea7\u3002<\/p>\n

\u7531\u4e8e\u5c06\u88684-1\u719f\u8bb0\u662f\u6bd4\u8f83\u56f0\u96be\u7684\uff0c\u4e3a\u4e86\u9632\u6b62\u4ea7\u751f\u6b67\u4e49\u5e76\u63d0\u9ad8\u53ef\u8bfb\u6027\uff0c\u5e94\u5f53\u7528\u62ec\u53f7\u786e\u5b9a\u8868\u8fbe\u5f0f\u7684\u64cd\u4f5c\u987a\u5e8f\u3002\u4f8b\u5982\uff1a<\/p>\n

word = (high << 8) | low<\/p>\n

if ((a | b) && (a
\n& c))<\/p>\n

\u00a0<\/p>\n

4.2 \u590d\u5408\u8868\u8fbe\u5f0f<\/font><\/strong><\/p>\n

\u5982 a = b = c =
\n0\u8fd9\u6837\u7684\u8868\u8fbe\u5f0f\u79f0\u4e3a\u590d\u5408\u8868\u8fbe\u5f0f\u3002\u5141\u8bb8\u590d\u5408\u8868\u8fbe\u5f0f\u5b58\u5728\u7684\u7406\u7531\u662f\uff1a\uff081\uff09\u4e66\u5199\u7b80\u6d01\uff1b\uff082\uff09\u53ef\u4ee5\u63d0\u9ad8\u7f16\u8bd1\u6548\u7387\u3002\u4f46\u8981\u9632\u6b62\u6ee5\u7528\u590d\u5408\u8868\u8fbe\u5f0f\u3002<\/p>\n

\u00a0<\/p>\n

\u25cf\u3010\u89c4\u52194-2-1\u3011\u4e0d\u8981\u7f16\u5199\u592a\u590d\u6742\u7684\u590d\u5408\u8868\u8fbe\u5f0f\u3002<\/p>\n

\u4f8b\u5982\uff1a<\/p>\n

i = a >= b && c
\n< d && c + f
\n<= g + h ; \/\/ \u590d\u5408\u8868\u8fbe\u5f0f\u8fc7\u4e8e\u590d\u6742<\/p>\n

\u00a0<\/p>\n

\u25cf\u3010\u89c4\u52194-2-2\u3011\u4e0d\u8981\u6709\u591a\u7528\u9014\u7684\u590d\u5408\u8868\u8fbe\u5f0f\u3002<\/p>\n

\u4f8b\u5982\uff1a<\/p>\n

d = (a = b + c) + r ;<\/p>\n

\u8be5\u8868\u8fbe\u5f0f\u65e2\u6c42a\u503c\u53c8\u6c42d\u503c\u3002\u5e94\u8be5\u62c6\u5206\u4e3a\u4e24\u4e2a\u72ec\u7acb\u7684\u8bed\u53e5\uff1a<\/p>\n

a = b + c;<\/p>\n

d = a + r;<\/p>\n

\u00a0<\/p>\n

\u25cf\u3010\u89c4\u52194-2-3\u3011\u4e0d\u8981\u628a\u7a0b\u5e8f\u4e2d\u7684\u590d\u5408\u8868\u8fbe\u5f0f\u4e0e\u201c\u771f\u6b63\u7684\u6570\u5b66\u8868\u8fbe\u5f0f\u201d\u6df7\u6dc6\u3002<\/p>\n

\u4f8b\u5982\uff1a<\/p>\n

if (a < b < c) \/\/ a
\n< b < c\u662f\u6570\u5b66\u8868\u8fbe\u5f0f\u800c\u4e0d\u662f\u7a0b\u5e8f\u8868\u8fbe\u5f0f<\/p>\n

\u5e76\u4e0d\u8868\u793a<\/p>\n

if ((a< &&><\/b><\/p>\n

\u800c\u662f\u6210\u4e86\u4ee4\u4eba\u8d39\u89e3\u7684<\/b><\/p>\n

if ( (a<><\/b><\/p>\n

\u00a0<\/b><\/p>\n

4.3 if \u8bed\u53e5<\/font><\/strong><\/p>\n

\nif\u8bed\u53e5\u662fC++\/C\u8bed\u8a00\u4e2d\u6700\u7b80\u5355\u3001\u6700\u5e38\u7528\u7684\u8bed\u53e5\uff0c\u7136\u800c\u5f88\u591a\u7a0b\u5e8f\u5458\u7528\u9690\u542b\u9519\u8bef\u7684\u65b9\u5f0f\u5199if\u8bed\u53e5\u3002\u672c\u8282\u4ee5\u201c\u4e0e\u96f6\u503c\u6bd4\u8f83\u201d\u4e3a\u4f8b\uff0c\u5c55\u5f00\u8ba8\u8bba\u3002<\/p>\n

4.3.1 \u5e03\u5c14\u53d8\u91cf\u4e0e\u96f6\u503c\u6bd4\u8f83<\/strong><\/p>\n

\u25cf\u3010\u89c4\u52194-3-1\u3011\u4e0d\u53ef\u5c06\u5e03\u5c14\u53d8\u91cf\u76f4\u63a5\u4e0eTRUE\u3001FALSE\u6216\u80051\u30010\u8fdb\u884c\u6bd4\u8f83\u3002<\/p>\n

\n\u6839\u636e\u5e03\u5c14\u7c7b\u578b\u7684\u8bed\u4e49\uff0c\u96f6\u503c\u4e3a\u201c\u5047\u201d\uff08\u8bb0\u4e3aFALSE\uff09\uff0c\u4efb\u4f55\u975e\u96f6\u503c\u90fd\u662f\u201c\u771f\u201d\uff08\u8bb0\u4e3aTRUE\uff09\u3002TRUE\u7684\u503c\u7a76\u7adf\u662f\u4ec0\u4e48\u5e76\u6ca1\u6709\u7edf\u4e00\u7684\u6807\u51c6\u3002\u4f8b\u5982Visual
\nC++ \u5c06TRUE\u5b9a\u4e49\u4e3a1\uff0c\u800cVisual Basic\u5219\u5c06TRUE\u5b9a\u4e49\u4e3a-1\u3002<\/p>\n

\u5047\u8bbe\u5e03\u5c14\u53d8\u91cf\u540d\u5b57\u4e3aflag\uff0c\u5b83\u4e0e\u96f6\u503c\u6bd4\u8f83\u7684\u6807\u51c6if\u8bed\u53e5\u5982\u4e0b\uff1a<\/p>\n

if (flag) \/\/ \u8868\u793aflag\u4e3a\u771f<\/p>\n

if (!flag) \/\/ \u8868\u793aflag\u4e3a\u5047<\/p>\n

\u5176\u5b83\u7684\u7528\u6cd5\u90fd\u5c5e\u4e8e\u4e0d\u826f\u98ce\u683c\uff0c\u4f8b\u5982\uff1a<\/p>\n

if (flag == TRUE)<\/p>\n

if (flag == 1 )<\/p>\n

if (flag == FALSE)<\/p>\n

if (flag == 0)<\/p>\n

4.3.2 \u6574\u578b\u53d8\u91cf\u4e0e\u96f6\u503c\u6bd4\u8f83<\/strong><\/p>\n

\u25cf\u3010\u89c4\u52194-3-2\u3011\u5e94\u5f53\u5c06\u6574\u578b\u53d8\u91cf\u7528\u201c==\u201d\u6216\u201c\uff01=\u201d\u76f4\u63a5\u4e0e0\u6bd4\u8f83\u3002<\/p>\n

\u5047\u8bbe\u6574\u578b\u53d8\u91cf\u7684\u540d\u5b57\u4e3avalue\uff0c\u5b83\u4e0e\u96f6\u503c\u6bd4\u8f83\u7684\u6807\u51c6if\u8bed\u53e5\u5982\u4e0b\uff1a<\/p>\n

if (value == 0)<\/p>\n

if (value != 0)<\/p>\n

\u4e0d\u53ef\u6a21\u4eff\u5e03\u5c14\u53d8\u91cf\u7684\u98ce\u683c\u800c\u5199\u6210<\/p>\n

if (value) \/\/ \u4f1a\u8ba9\u4eba\u8bef\u89e3 value\u662f\u5e03\u5c14\u53d8\u91cf<\/p>\n

if (!value)<\/p>\n

4.3.3 \u6d6e\u70b9\u53d8\u91cf\u4e0e\u96f6\u503c\u6bd4\u8f83<\/strong><\/p>\n

\u25cf\u3010\u89c4\u52194-3-3\u3011\u4e0d\u53ef\u5c06\u6d6e\u70b9\u53d8\u91cf\u7528\u201c==\u201d\u6216\u201c\uff01=\u201d\u4e0e\u4efb\u4f55\u6570\u5b57\u6bd4\u8f83\u3002<\/p>\n

\n\u5343\u4e07\u8981\u7559\u610f\uff0c\u65e0\u8bba\u662ffloat\u8fd8\u662fdouble\u7c7b\u578b\u7684\u53d8\u91cf\uff0c\u90fd\u6709\u7cbe\u5ea6\u9650\u5236\u3002\u6240\u4ee5\u4e00\u5b9a\u8981\u907f\u514d\u5c06\u6d6e\u70b9\u53d8\u91cf\u7528\u201c==\u201d\u6216\u201c\uff01=\u201d\u4e0e\u6570\u5b57\u6bd4\u8f83\uff0c\u5e94\u8be5\u8bbe\u6cd5\u8f6c\u5316\u6210\u201c>=\u201d\u6216\u201c<=\u201d\u5f62\u5f0f\u3002<\/p>\n

\u5047\u8bbe\u6d6e\u70b9\u53d8\u91cf\u7684\u540d\u5b57\u4e3ax\uff0c\u5e94\u5f53\u5c06<\/p>\n

if (x == 0.0) \/\/ \u9690\u542b\u9519\u8bef\u7684\u6bd4\u8f83<\/p>\n

\u8f6c\u5316\u4e3a<\/p>\n

if ((x>=-EPSINON)
\n&& (x<=EPSINON))<\/p>\n

\u5176\u4e2dEPSINON\u662f\u5141\u8bb8\u7684\u8bef\u5dee\uff08\u5373\u7cbe\u5ea6\uff09\u3002<\/p>\n

4.3.4 \u6307\u9488\u53d8\u91cf\u4e0e\u96f6\u503c\u6bd4\u8f83<\/strong><\/p>\n

\u25cf\u3010\u89c4\u52194-3-4\u3011\u5e94\u5f53\u5c06\u6307\u9488\u53d8\u91cf\u7528\u201c==\u201d\u6216\u201c\uff01=\u201d\u4e0eNULL\u6bd4\u8f83\u3002<\/p>\n

\n\u6307\u9488\u53d8\u91cf\u7684\u96f6\u503c\u662f\u201c\u7a7a\u201d\uff08\u8bb0\u4e3aNULL\uff09\u3002\u5c3d\u7ba1NULL\u7684\u503c\u4e0e0\u76f8\u540c\uff0c\u4f46\u662f\u4e24\u8005\u610f\u4e49\u4e0d\u540c\u3002\u5047\u8bbe\u6307\u9488\u53d8\u91cf\u7684\u540d\u5b57\u4e3ap\uff0c\u5b83\u4e0e\u96f6\u503c\u6bd4\u8f83\u7684\u6807\u51c6if\u8bed\u53e5\u5982\u4e0b\uff1a<\/p>\n

if (p == NULL) \/\/ p\u4e0eNULL\u663e\u5f0f\u6bd4\u8f83\uff0c\u5f3a\u8c03p\u662f\u6307\u9488\u53d8\u91cf<\/p>\n

if (p != NULL)<\/p>\n

\u4e0d\u8981\u5199\u6210<\/p>\n

if (p == 0) \/\/ \u5bb9\u6613\u8ba9\u4eba\u8bef\u89e3p\u662f\u6574\u578b\u53d8\u91cf<\/p>\n

if (p != 0)<\/p>\n

\u6216\u8005<\/p>\n

if (p) \/\/ \u5bb9\u6613\u8ba9\u4eba\u8bef\u89e3p\u662f\u5e03\u5c14\u53d8\u91cf<\/p>\n

if (!p)<\/p>\n

4.3.5 \u5bf9if\u8bed\u53e5\u7684\u8865\u5145\u8bf4\u660e<\/strong><\/p>\n

\u6709\u65f6\u5019\u6211\u4eec\u53ef\u80fd\u4f1a\u770b\u5230 if (NULL == p) \u8fd9\u6837\u53e4\u602a\u7684\u683c\u5f0f\u3002\u4e0d\u662f\u7a0b\u5e8f\u5199\u9519\u4e86\uff0c\u662f\u7a0b\u5e8f\u5458\u4e3a\u4e86\u9632\u6b62\u5c06 if (p ==
\nNULL) \u8bef\u5199\u6210 if (p = NULL)\uff0c\u800c\u6709\u610f\u628ap\u548cNULL\u98a0\u5012\u3002\u7f16\u8bd1\u5668\u8ba4\u4e3a if (p = NULL) \u662f\u5408\u6cd5\u7684\uff0c\u4f46\u662f\u4f1a\u6307\u51fa
\nif (NULL = p)\u662f\u9519\u8bef\u7684\uff0c\u56e0\u4e3aNULL\u4e0d\u80fd\u88ab\u8d4b\u503c\u3002<\/p>\n

\u7a0b\u5e8f\u4e2d\u6709\u65f6\u4f1a\u9047\u5230if\/else\/return\u7684\u7ec4\u5408\uff0c\u5e94\u8be5\u5c06\u5982\u4e0b\u4e0d\u826f\u98ce\u683c\u7684\u7a0b\u5e8f<\/p>\n

if (condition)<\/p>\n

return x;<\/p>\n

return y;<\/p>\n

\u6539\u5199\u4e3a<\/p>\n

if (condition)<\/p>\n

{<\/p>\n

return x;<\/p>\n

}<\/p>\n

else<\/p>\n

{<\/p>\n

return y;<\/p>\n

}<\/p>\n

\u6216\u8005\u6539\u5199\u6210\u66f4\u52a0\u7b80\u7ec3\u7684<\/p>\n

return (condition ? x : y);<\/p>\n

\u00a0<\/p>\n

4.4 \u5faa\u73af\u8bed\u53e5\u7684\u6548\u7387<\/font><\/strong><\/p>\n

\nC++\/C\u5faa\u73af\u8bed\u53e5\u4e2d\uff0cfor\u8bed\u53e5\u4f7f\u7528\u9891\u7387\u6700\u9ad8\uff0cwhile\u8bed\u53e5\u5176\u6b21\uff0cdo\u8bed\u53e5\u5f88\u5c11\u7528\u3002\u672c\u8282\u91cd\u70b9\u8bba\u8ff0\u5faa\u73af\u4f53\u7684\u6548\u7387\u3002\u63d0\u9ad8\u5faa\u73af\u4f53\u6548\u7387\u7684\u57fa\u672c\u529e\u6cd5\u662f\u964d\u4f4e\u5faa\u73af\u4f53\u7684\u590d\u6742\u6027\u3002<\/p>\n

\u00a0<\/p>\n

\n\u25cf\u3010\u5efa\u8bae4-4-1\u3011\u5728\u591a\u91cd\u5faa\u73af\u4e2d\uff0c\u5982\u679c\u6709\u53ef\u80fd\uff0c\u5e94\u5f53\u5c06\u6700\u957f\u7684\u5faa\u73af\u653e\u5728\u6700\u5185\u5c42\uff0c\u6700\u77ed\u7684\u5faa\u73af\u653e\u5728\u6700\u5916\u5c42\uff0c\u4ee5\u51cf\u5c11CPU\u8de8\u5207\u5faa\u73af\u5c42\u7684\u6b21\u6570\u3002\u4f8b\u5982\u793a\u4f8b4-4(b)\u7684\u6548\u7387\u6bd4\u793a\u4f8b4-4(a)\u7684\u9ad8\u3002<\/p>\n\n\n\n
\n

for (row=0; row<100; row++)<\/p>\n

{<\/p>\n

for ( col=0; col<5; col++ )<\/p>\n

{<\/p>\n

sum = sum + a[row][col];<\/p>\n

}<\/p>\n

}<\/p>\n<\/td>\n

\n

for (col=0; col<5; col++ )<\/p>\n

{<\/p>\n

for (row=0; row<100; row++)<\/p>\n

{<\/p>\n

sum = sum + a[row][col];<\/p>\n

}<\/p>\n

}<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u793a\u4f8b4-4(a) \u4f4e\u6548\u7387\uff1a\u957f\u5faa\u73af\u5728\u6700\u5916\u5c42
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u793a\u4f8b4-4(b)
\n\u9ad8\u6548\u7387\uff1a\u957f\u5faa\u73af\u5728\u6700\u5185\u5c42<\/p>\n

\u00a0<\/p>\n

\n\u25cf\u3010\u5efa\u8bae4-4-2\u3011\u5982\u679c\u5faa\u73af\u4f53\u5185\u5b58\u5728\u903b\u8f91\u5224\u65ad\uff0c\u5e76\u4e14\u5faa\u73af\u6b21\u6570\u5f88\u5927\uff0c\u5b9c\u5c06\u903b\u8f91\u5224\u65ad\u79fb\u5230\u5faa\u73af\u4f53\u7684\u5916\u9762\u3002\u793a\u4f8b4-4(c)\u7684\u7a0b\u5e8f\u6bd4\u793a\u4f8b4-4(d)\u591a\u6267\u884c\u4e86N-1\u6b21\u903b\u8f91\u5224\u65ad\u3002\u5e76\u4e14\u7531\u4e8e\u524d\u8005\u8001\u8981\u8fdb\u884c\u903b\u8f91\u5224\u65ad\uff0c\u6253\u65ad\u4e86\u5faa\u73af\u201c\u6d41\u6c34\u7ebf\u201d\u4f5c\u4e1a\uff0c\u4f7f\u5f97\u7f16\u8bd1\u5668\u4e0d\u80fd\u5bf9\u5faa\u73af\u8fdb\u884c\u4f18\u5316\u5904\u7406\uff0c\u964d\u4f4e\u4e86\u6548\u7387\u3002\u5982\u679cN\u975e\u5e38\u5927\uff0c\u6700\u597d\u91c7\u7528\u793a\u4f8b4-4(d)\u7684\u5199\u6cd5\uff0c\u53ef\u4ee5\u63d0\u9ad8\u6548\u7387\u3002\u5982\u679cN\u975e\u5e38\u5c0f\uff0c\u4e24\u8005\u6548\u7387\u5dee\u522b\u5e76\u4e0d\u660e\u663e\uff0c\u91c7\u7528\u793a\u4f8b4-4(c)\u7684\u5199\u6cd5\u6bd4\u8f83\u597d\uff0c\u56e0\u4e3a\u7a0b\u5e8f\u66f4\u52a0\u7b80\u6d01\u3002<\/p>\n\n\n\n
\n

for (i=0; i<><\/p>\n

{<\/p>\n

if (condition)<\/p>\n

DoSomething();<\/p>\n

else<\/p>\n

DoOtherthing();<\/p>\n

}<\/p>\n<\/td>\n

\n

if (condition)<\/p>\n

{<\/p>\n

for (i=0; i<><\/p>\n

DoSomething();<\/p>\n

}<\/p>\n

else<\/p>\n

{<\/p>\n

for (i=0; i<><\/p>\n

DoOtherthing();<\/p>\n

}<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u88684-4(c) \u6548\u7387\u4f4e\u4f46\u7a0b\u5e8f\u7b80\u6d01
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u88684-4(d)
\n\u6548\u7387\u9ad8\u4f46\u7a0b\u5e8f\u4e0d\u7b80\u6d01<\/p>\n

\u00a0<\/p>\n

4.5 for \u8bed\u53e5\u7684\u5faa\u73af\u63a7\u5236\u53d8\u91cf<\/font><\/strong><\/p>\n

\u25cf\u3010\u89c4\u52194-5-1\u3011\u4e0d\u53ef\u5728for \u5faa\u73af\u4f53\u5185\u4fee\u6539\u5faa\u73af\u53d8\u91cf\uff0c\u9632\u6b62for \u5faa\u73af\u5931\u53bb\u63a7\u5236\u3002<\/p>\n

\u25cf\u3010\u5efa\u8bae4-5-1\u3011\u5efa\u8baefor\u8bed\u53e5\u7684\u5faa\u73af\u63a7\u5236\u53d8\u91cf\u7684\u53d6\u503c\u91c7\u7528\u201c\u534a\u5f00\u534a\u95ed\u533a\u95f4\u201d\u5199\u6cd5\u3002<\/p>\n

\u793a\u4f8b4-5(a)\u4e2d\u7684x\u503c\u5c5e\u4e8e\u534a\u5f00\u534a\u95ed\u533a\u95f4\u201c0 =< x <
\nN\u201d\uff0c\u8d77\u70b9\u5230\u7ec8\u70b9\u7684\u95f4\u9694\u4e3aN\uff0c\u5faa\u73af\u6b21\u6570\u4e3aN\u3002<\/p>\n

\u793a\u4f8b4-5(b)\u4e2d\u7684x\u503c\u5c5e\u4e8e\u95ed\u533a\u95f4\u201c0 =< x <=
\nN-1\u201d\uff0c\u8d77\u70b9\u5230\u7ec8\u70b9\u7684\u95f4\u9694\u4e3aN-1\uff0c\u5faa\u73af\u6b21\u6570\u4e3aN\u3002<\/p>\n

\u76f8\u6bd4\u4e4b\u4e0b\uff0c\u793a\u4f8b4-5(a)\u7684\u5199\u6cd5\u66f4\u52a0\u76f4\u89c2\uff0c\u5c3d\u7ba1\u4e24\u8005\u7684\u529f\u80fd\u662f\u76f8\u540c\u7684\u3002<\/p>\n\n\n\n
\n

for (int x=0; x<><\/p>\n

{<\/p>\n

\u2026<\/p>\n

}<\/p>\n<\/td>\n

\n

for (int x=0; x<=N-1; x++)<\/p>\n

{<\/p>\n

\u2026<\/p>\n

}<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u793a\u4f8b4-5(a)
\n\u5faa\u73af\u53d8\u91cf\u5c5e\u4e8e\u534a\u5f00\u534a\u95ed\u533a\u95f4\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0
\n\u793a\u4f8b4-5(b) \u5faa\u73af\u53d8\u91cf\u5c5e\u4e8e\u95ed\u533a\u95f4<\/p>\n

\u00a0<\/p>\n

4.6 switch\u8bed\u53e5<\/font><\/strong><\/p>\n

\u6709\u4e86if\u8bed\u53e5\u4e3a\u4ec0\u4e48\u8fd8\u8981switch\u8bed\u53e5\uff1f<\/p>\n

\nswitch\u662f\u591a\u5206\u652f\u9009\u62e9\u8bed\u53e5\uff0c\u800cif\u8bed\u53e5\u53ea\u6709\u4e24\u4e2a\u5206\u652f\u53ef\u4f9b\u9009\u62e9\u3002\u867d\u7136\u53ef\u4ee5\u7528\u5d4c\u5957\u7684if\u8bed\u53e5\u6765\u5b9e\u73b0\u591a\u5206\u652f\u9009\u62e9\uff0c\u4f46\u90a3\u6837\u7684\u7a0b\u5e8f\u5197\u957f\u96be\u8bfb\u3002\u8fd9\u662fswitch\u8bed\u53e5\u5b58\u5728\u7684\u7406\u7531\u3002<\/p>\n

switch\u8bed\u53e5\u7684\u57fa\u672c\u683c\u5f0f\u662f\uff1a<\/p>\n

switch (variable)<\/p>\n

{<\/p>\n

case value1 : \u2026<\/p>\n

break;<\/p>\n

case value2 : \u2026<\/p>\n

break;<\/p>\n

\u2026<\/p>\n

default : \u2026<\/p>\n

break;<\/p>\n

}<\/p>\n

\u00a0<\/p>\n

\u25cf\u3010\u89c4\u52194-6-1\u3011\u6bcf\u4e2acase\u8bed\u53e5\u7684\u7ed3\u5c3e\u4e0d\u8981\u5fd8\u4e86\u52a0break\uff0c\u5426\u5219\u5c06\u5bfc\u81f4\u591a\u4e2a\u5206\u652f\u91cd\u53e0\uff08\u9664\u975e\u6709\u610f\u4f7f\u591a\u4e2a\u5206\u652f\u91cd\u53e0\uff09\u3002<\/p>\n

\u25cf\u3010\u89c4\u52194-6-2\u3011\u4e0d\u8981\u5fd8\u8bb0\u6700\u540e\u90a3\u4e2adefault\u5206\u652f\u3002\u5373\u4f7f\u7a0b\u5e8f\u771f\u7684\u4e0d\u9700\u8981default\u5904\u7406\uff0c\u4e5f\u5e94\u8be5\u4fdd\u7559\u8bed\u53e5 default :
\nbreak; \u8fd9\u6837\u505a\u5e76\u975e\u591a\u6b64\u4e00\u4e3e\uff0c\u800c\u662f\u4e3a\u4e86\u9632\u6b62\u522b\u4eba\u8bef\u4ee5\u4e3a\u4f60\u5fd8\u4e86default\u5904\u7406\u3002<\/p>\n

\u00a0<\/p>\n

4.7 goto\u8bed\u53e5<\/font><\/strong><\/p>\n

\n\u81ea\u4ece\u63d0\u5021\u7ed3\u6784\u5316\u8bbe\u8ba1\u4ee5\u6765\uff0cgoto\u5c31\u6210\u4e86\u6709\u4e89\u8bae\u7684\u8bed\u53e5\u3002\u9996\u5148\uff0c\u7531\u4e8egoto\u8bed\u53e5\u53ef\u4ee5\u7075\u6d3b\u8df3\u8f6c\uff0c\u5982\u679c\u4e0d\u52a0\u9650\u5236\uff0c\u5b83\u7684\u786e\u4f1a\u7834\u574f\u7ed3\u6784\u5316\u8bbe\u8ba1\u98ce\u683c\u3002\u5176\u6b21\uff0cgoto\u8bed\u53e5\u7ecf\u5e38\u5e26\u6765\u9519\u8bef\u6216\u9690\u60a3\u3002\u5b83\u53ef\u80fd\u8df3\u8fc7\u4e86\u67d0\u4e9b\u5bf9\u8c61\u7684\u6784\u9020\u3001\u53d8\u91cf\u7684\u521d\u59cb\u5316\u3001\u91cd\u8981\u7684\u8ba1\u7b97\u7b49\u8bed\u53e5\uff0c\u4f8b\u5982\uff1a<\/p>\n

goto state;<\/p>\n

String s1, s2; \/\/ \u88abgoto\u8df3\u8fc7<\/p>\n

int sum = 0; \/\/ \u88abgoto\u8df3\u8fc7<\/p>\n

\u2026<\/p>\n

state:<\/p>\n

\u2026<\/p>\n

\u5982\u679c\u7f16\u8bd1\u5668\u4e0d\u80fd\u53d1\u89c9\u6b64\u7c7b\u9519\u8bef\uff0c\u6bcf\u7528\u4e00\u6b21goto\u8bed\u53e5\u90fd\u53ef\u80fd\u7559\u4e0b\u9690\u60a3\u3002<\/p>\n

\u5f88\u591a\u4eba\u5efa\u8bae\u5e9f\u9664C++\/C\u7684goto\u8bed\u53e5\uff0c\u4ee5\u7edd\u540e\u60a3\u3002\u4f46\u5b9e\u4e8b\u6c42\u662f\u5730\u8bf4\uff0c\u9519\u8bef\u662f\u7a0b\u5e8f\u5458\u81ea\u5df1\u9020\u6210\u7684\uff0c\u4e0d\u662fgoto\u7684\u8fc7\u9519\u3002goto
\n\u8bed\u53e5\u81f3\u5c11\u6709\u4e00\u5904\u53ef\u663e\u795e\u901a\uff0c\u5b83\u80fd\u4ece\u591a\u91cd\u5faa\u73af\u4f53\u4e2d\u54bb\u5730\u4e00\u4e0b\u5b50\u8df3\u5230\u5916\u9762\uff0c\u7528\u4e0d\u7740\u5199\u5f88\u591a\u6b21\u7684break\u8bed\u53e5; \u4f8b\u5982<\/p>\n

{ \u2026<\/p>\n

{ \u2026<\/p>\n

{ \u2026<\/p>\n

goto error;<\/p>\n

}<\/p>\n

}<\/p>\n

}<\/p>\n

error:<\/p>\n

\u2026<\/p>\n

\u5c31\u8c61\u697c\u623f\u7740\u706b\u4e86\uff0c\u6765\u4e0d\u53ca\u4ece\u697c\u68af\u4e00\u7ea7\u4e00\u7ea7\u5f80\u4e0b\u8d70\uff0c\u53ef\u4ece\u7a97\u53e3\u8df3\u51fa\u706b\u5751\u3002\u6240\u4ee5\u6211\u4eec\u4e3b\u5f20\u5c11\u7528\u3001\u614e\u7528goto\u8bed\u53e5\uff0c\u800c\u4e0d\u662f\u7981\u7528\u3002<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

\u9ad8\u8d28\u91cfC++\u6559\u7a0b — \u7b2c4\u7ae0 \u8868\u8fbe\u5f0f\u548c\u57fa\u672c\u8bed\u53e5 \u6765\u6e90:www.vcworld.net\u3000 \u8bfb\u8005\u53ef\u80fd\u6000\u7591\uff1a\u8fdeif … \u7ee7\u7eed\u9605\u8bfb\u201c\u9ad8\u8d28\u91cfC++\u6559\u7a0b — \u7b2c4\u7ae0 \u8868\u8fbe\u5f0f\u548c\u57fa\u672c\u8bed\u53e5\u201d<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[24,83,163,42,62,74],"class_list":["post-173","post","type-post","status-publish","format-standard","hentry","category-c","tag-c","tag-it","tag-163","tag-42","tag-62","tag-74"],"_links":{"self":[{"href":"https:\/\/www.keyboardmeow.com\/index.php?rest_route=\/wp\/v2\/posts\/173","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.keyboardmeow.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.keyboardmeow.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.keyboardmeow.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.keyboardmeow.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=173"}],"version-history":[{"count":0,"href":"https:\/\/www.keyboardmeow.com\/index.php?rest_route=\/wp\/v2\/posts\/173\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.keyboardmeow.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=173"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.keyboardmeow.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=173"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.keyboardmeow.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=173"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}