{"id":627,"date":"2010-06-16T06:50:25","date_gmt":"2010-06-16T12:50:25","guid":{"rendered":"http:\/\/edsionte.com\/techblog\/?p=627"},"modified":"2010-10-12T09:48:47","modified_gmt":"2010-10-12T01:48:47","slug":"c%e8%af%ad%e8%a8%80%e9%9d%a2%e8%af%95%e7%b2%be%e9%80%89","status":"publish","type":"post","link":"http:\/\/edsionte.com\/techblog\/archives\/627","title":{"rendered":"C\u8bed\u8a00\u7b14\u8bb0\u672c"},"content":{"rendered":"

\u5728\u6b64\u8bb0\u5f55\u4e00\u4e9b\u5e38\u89c1\u7684C\u8bed\u8a00\u9519\u8bef\uff0c\u53ef\u4ee5\u5f53\u4f5c\u5b66\u4e60C\u8bed\u8a00\u7684\u7b14\u8bb0\uff0c\u9700\u8981\u7684\u65f6\u5019\u53ef\u4ee5\u56de\u8fc7\u5934\u770b\u770b\u3002<\/p>\n

1.\u5173\u4e8e\u201c\uff0b\uff0b\u201d<\/p>\n

#include\r\nint main()\r\n{\r\n\tint a,b,cd;\r\n\ta=10;\r\n\tb=a++;\r\n\tc=++a;\r\n\td=10*a++;\r\n        printf(\"a=%d b=%d c=%d d=%d\\n\",a,b,c,d);\r\n\treturn 0;\r\n}<\/pre>\n
\u5173\u4e8e\u81ea\u52a0\u81ea\u51cf\u8fd0\u7b97\u7b26\u7528\u4e8e\u53e5\u8bdd\u5c31\u53ef\u4ee5\u603b\u7ed3\uff1aa++\u5148\u4f7f\u7528\u540e\u81ea\u52a0\uff0c++a\u5148\u81ea\u52a0\u518d\u5f15\u7528\u3002\u8fd9\u6837\u5c31\u53ef\u4ee5\u8f7b\u677e\u5f97\u51fa\u7ed3\u679c\uff1a<\/p>\n
edsionte@edsionte-laptop:~\/code$ .\/test\r\na=13 b=10 c=12 d=120<\/pre>\n
2.\u4ea4\u6362\u53d8\u91cf
\n\u7b2c\u4e00\u79cd\u65b9\u6cd5\u5373\u4e2d\u95f4\u53d8\u91cf\u6cd5\uff0c\u4e0b\u9762\u8bf4\u660e\u7b2c\u4e8c\u79cd\uff0c\u4e0d\u6dfb\u52a0\u4e2d\u95f4\u53d8\u91cf\uff1a<\/p>\n
int a=1,b=2;\r\na=a+b;\r\nb=a-b;\r\na=a-b;<\/pre>\n
3.char* str=”hello world”; sizeof(str)=12,strlen(str)=11.\u56e0\u4e3astrlen\u51fd\u6570\u6c42\u5b57\u7b26\u4e32\u957f\u5ea6\u65f6\u4e0d\u5305\u542b\u5b57\u7b26\u4e32\u672b\u5c3e\u7684’\\0’\u3002<\/p>\n
4.char a[10];int len=strlen(a); len\u5176\u5b9e\u4e0d\u7b49\u4e8e10\uff0c\u5e94\u8be5\u6ce8\u610fstrlen\u6c42\u7684\u662f\u4ece\u5b57\u7b26\u4e32\u7b2c\u4e00\u4e2a\u5143\u7d20\u5230\u2018\\0\u2019\u4e4b\u95f4\u5b57\u7b26\u603b\u6570\uff08\u4e0d\u5305\u542b\u2018\\0\u2019\uff09\uff0c\u800c\u6b64\u6570\u7ec4\u672a\u521d\u59cb\u5316\u3002\u5c3d\u7ba1\u8bed\u6cd5\u4e0a\u662f\u6b63\u786e\u7684\uff0c\u4f46\u662f\u7528\u6cd5\u9519\u8bef\u3002\u5982\u679c\u6362\u4f5csizeof(a)\uff0c\u7ed3\u679c\u4fbf\u662f10\u3002<\/p>\n
5.int(*s[10])(int) \u8868\u793a\u4ec0\u4e48\uff1f<\/p>\n
\u8fd9\u4e2a\u8bed\u53e5\u770b\u8d77\u6765\u5f88\u590d\u6742\uff0c\u4e0d\u8fc7\u6211\u4eec\u4e00\u6b65\u6b65\u6765\u5206\u6790\u3002\u9996\u5148s[10]\u662f\u4e00\u4e2a\u6570\u7ec4\uff0c*s[10]\u8bf4\u660e\u4ed6\u7684\u5143\u7d20\u662f\u6307\u9488\u3002\u90a3\u79cd\u7c7b\u578b\u7684\u6307\u9488\u5462\uff1f\u6574\u4f53\u6765\u770b\u8fd9\u4e2a\u8bed\u53e5\uff1aint(*)(int)\uff0c\u4e0d\u7528\u591a\u8bf4\u662f\u51fd\u6570\u6307\u9488\u3002\u90a3\u4e48\u8fdb\u4e00\u6b65\u8bf4\u5c31\u662f\uff0cs[10]\u662f\u4e00\u4e2a\u670910\u4e2a\u5143\u7d20\u7684\u6307\u9488\u6570\u7ec4\uff0c\u6bcf\u4e2a\u5143\u7d20\u90fd\u6307\u5411\u4e00\u4e2a\u51fd\u6570\uff0c\u5e76\u4e14\u8fd9\u4e2a\u51fd\u6570\u6709\u4e00\u4e2aint\u53c2\u6570\uff0c\u5e76\u4e14\u8fd4\u56deint\u578b\u7684\u503c\u3002\u8fd9\u6837\u770b\u597d\u50cf\u5f88\u9ebb\u70e6\uff0c\u4e0d\u4e45\u662f\u4e00\u4e2a\u6307\u9488\u6570\u7ec4\u5417\uff0c\u4f55\u5fc5\u8fd9\u4e48\u9ebb\u70e6\u3002\u4e3a\u4e86\u597d\u7406\u89e3\uff0c\u6211\u4eec\u53ef\u4ee5\u8fd9\u4e48\u770b\uff1aint(*)(int) \u00a0s[10]\u3002<\/p>\n
\u7c7b\u4f3c\u7684\u5bf9\u4e8e\u6570\u7ec4\u6307\u9488\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u8fd9\u4e48\u7406\u89e3\uff0c\u4ee5\u4fbf\u52a0\u6df1\u8bb0\u5fc6\u3002\u6bd4\u5982int (*s)[10];s\u662f\u4e00\u4e2a\u6307\u5411\u6570\u7ec4\u7684\u6307\u9488\uff0c\u8fd9\u6837\u5b9a\u4e49\u4e00\u4e2a\u6307\u9488\u8bf4\u5b9e\u8bdd\u5f88\u96be\u8ba9\u4eba\u7406\u89e3\u3002\u90a3\u4e48\u6211\u4eec\u4e0d\u8981\u88ab\u4ed6\u8fd9\u4e2a\u6837\u5b50\u800c\u8ff7\u60d1\uff0c\u90a3\u5c31\u8fd9\u4e48\u7406\u89e3\u5427\uff1aint (*)[10] s;\u8fd9\u6837\u5f88\u7b26\u5408\u4e00\u822c\u6307\u9488\u5b9a\u4e49\u7684\u89c4\u5219\u3002<\/p>\n
6.\u5982\u4e0b\u8bed\u53e5\uff1a<\/p>\n
char* dest=”hello,world”;<\/p>\n
char* src=”hello”;<\/p>\n
puts(strcpy(dest,src));<\/p>\n
\u8fd9\u6837\u505a\u662f\u9519\u8bef\u7684\uff0c\u539f\u59cb\u662f\u56e0\u4e3adest\u6307\u5411\u5b57\u7b26\u4e32\u5e38\u91cf\uff0c\u4e0d\u53ef\u4fee\u6539\u5176\u67d0\u4e2a\u5b57\u7b26\u503c\u3002\u5176\u5b9e\u6b63\u786e\u7684\u5199\u6cd5\u5e94\u8be5\u662fconst char* dest=”hello,world”;\u4f46\u662f\u4e00\u822c\u60c5\u51b5\u4e0b\u4e0d\u52a0const\u7f16\u8bd1\u7684\u65f6\u5019\u4e5f\u4e0d\u4f1a\u51fa\u9519\u3002\u4f46\u662f\u5982\u679cdest[2]=’a’;\u90a3\u4e48\u5c31\u4f1a\u51fa\u9519\uff0c\u5373\u4fbf\u8fd9\u6761\u8bed\u53e5\u5408\u4e4e\u8bed\u6cd5\u3002\u5982\u679c char a[100]; char* dest=a;\u56e0\u4e3a\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u662f\u53d8\u91cf\uff0c\u53ef\u4ee5\u4fee\u6539\uff0c\u4e5f\u5c31\u53ef\u6210\u529f\u6253\u5370\u3002\u5982\u679c\u6709\u4e0b\u9762\u8bed\u53e5:char str[100]=”hello,world”\uff0c\u8fd9\u6837\u5199\u5b8c\u5168\u6b63\u786e\uff0c\u56e0\u4e3a\u53ea\u662f\u7528hello world\u521d\u59cb\u5316\u8fd9\u4e2a\u6570\u7ec4\u800c\u5df2\u3002<\/p>\n
7.\u60f3\u8981\u8f93\u5165\u4e0b\u9762\u4e00\u6bb5\u5b57\u7b26\u4e32\uff1aedsionte is a goog boy\u3002\u7528scanf\u51fd\u6570\u662f\u4e0d\u884c\u7684\u3002\u56e0\u4e3ascanf\u51fd\u6570\u4ee5\u56de\u8f66\u952e\u548c\u7a7a\u683c\u952e\u4f5c\u4e3a\u5b57\u7b26\u4e32\u8f93\u5165\u7ed3\u675f\u7684\u6807\u5fd7\u3002\u800cgets\u51fd\u6570\u5219\u4ec5\u4ee5\u56de\u8f66\u952e\u4f5c\u4e3a\u5b57\u7b26\u4e32\u8f93\u5165\u7684\u7ed3\u675f\u7b26\u3002\u56e0\u6b64\u53ef\u4ee5\u4f7f\u7528gets\u51fd\u6570\u6765\u63a5\u6536\u542b\u6709\u7a7a\u683c\u952e\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n
8.\u5b8f\u5b9a\u4e49\u548c\u9884\u7f16\u8bd1\u4e0d\u5c5e\u4e8ec\u8bed\u8a00\u8bed\u53e5\uff0c\u56e0\u6b64\u4e0d\u5df2\uff1b\u7ed3\u5c3e\u3002\u800c\u7ed3\u6784\u4f53\u5b9a\u4e49\u5c5e\u4e8ec\u8bed\u8a00\u8bed\u53e5\uff0c\u5e94\u8be5\u4ee5\u5206\u53f7\u7ed3\u5c3e\u3002<\/p>\n
9.\u5171\u7528\u4f53\u5185\u53ef\u4ee5\u5b9a\u4e49\u591a\u4e2a\u4e0d\u540c\u7c7b\u578b\u7684\u6210\u5458\u53d8\u91cf \uff0c\u4f46\u662f\u6bcf\u6b21\u53ea\u80fd\u4f7f\u7528\u4e00\u4e2a\u53d8\u91cf\u3002\u5373\u8fd9\u4e9b\u53d8\u91cf\u5171\u540c\u4f7f\u7528\u4e00\u6bb5\u5185\u5b58\u7a7a\u95f4\uff0c\u8fd9\u6bb5\u5185\u5b58\u7a7a\u95f4\u7684\u5927\u5c0f\u7531\u8fd9\u4e9b\u53d8\u91cf\u4e2d\u957f\u5ea6\u6700\u957f\u7684\u53d8\u91cf\u51b3\u5b9a\u3002<\/p>\n
10.\u5bf9\u4e8eint a[5]\u8fd9\u4e2a\u6570\u7ec4\u6765\u8bf4\uff0ca,&a,&a[0],a+1,&a+1,&a[0]+1\u5404\u4ee3\u8868\u4ec0\u4e48\uff1f<\/p>\n
a:a\u662f\u8fd9\u4e2a\u6570\u7ec4\u7684\u540d\u79f0\uff0c\u5b83\u4ee3\u8868\u6570\u7ec4\u9996\u5143\u7d20\u7684\u9996\u5730\u5740\uff0c\u4e5f\u5c31\u662fa[0]\u7684\u9996\u5730\u5740\u3002<\/p>\n
&a:\u662f\u6570\u7ec4\u7684\u9996\u5730\u5740\u3002\u6ce8\u610f\u5982\u679c\u6253\u5370a\u548c&a\u7684\u503c\uff0c\u4e24\u8005\u662f\u4e00\u6837\u7684\uff0c\u4f46\u662f\u610f\u4e49\u4e0d\u540c\u3002<\/p>\n
&a[0]:a[0]\u7684\u9996\u5730\u5740\uff0c\u7b49\u4ef7\u4e8ea\u3002<\/p>\n
a+1:\u6570\u7ec4\u4e2d\u4e0b\u4e00\u4e2a\u5143\u7d20\u7684\u5730\u5740\uff0c\u5373a[1]\u7684\u5730\u5740\u3002<\/p>\n
&a+1:\u8fd9\u662f\u4e00\u4e2a\u6307\u5411\u4e0b\u4e00\u4e2a\u6570\u7ec4\u7684\u6307\u9488\uff0c\u8fd9\u4e2a\u6570\u7ec4\u662f\u4e00\u4e2a\u957f\u5ea6\u4e3a5\u7684\u6574\u578b\u6570\u7ec4\u3002<\/p>\n
&a[0]+1:\u7b49\u4ef7\u4e8ea+1\u3002<\/p>\n
11.\u5728\u4e00\u822c\u768432\u4f4d\u673a\u5f53\u4e2d\uff0c\u6307\u9488\u7c7b\u578b\u5747\u4e3a4\u4e2a\u5b57\u8282\uff0c\u5373\u4fbf\u8fd9\u4e2a\u6307\u9488\u6307\u5411\u4e00\u4e2a\u5b57\u7b26\uff0c\u56e0\u4e3a\u6307\u9488\u8bf4\u5230\u5e95\u8fd8\u662f\u5730\u5740\u3002\u5bf9\u4e8e\u4e00\u4e2a\u6570\u7ec4int a[10]\uff0c\u90a3\u4e48sizeof(a)=10*4\uff1b\u4f46\u662f\u5982\u679cp\u662f\u4e00\u4e2a\u6307\u5411\u6b64\u6570\u7ec4\u7684\u6307\u9488\uff0c\u90a3\u4e48sizeof(p)\u5c31\u662f4\u3002<\/p>\n
12.\u7ed9\u4e00\u4e2a\u6307\u9488\u52a0\u4e0a\u4e00\u4e2a\u6574\u6570\u4e0e\u7ed9\u8be5\u6307\u9488\u7684\u4e8c\u8fdb\u5236\u8868\u793a\u52a0\u4e0a\u540c\u6837\u7684\u6574\u6570\u542b\u4e49\u662f\u4e0d\u540c\u7684\u3002\u6bd4\u5982int a[10];int *p=a;\u90a3\u4e48p+1\u6307\u5411\u7684\u662f\u8fd9\u4e2a\u6570\u7ec4\u7684\u7b2c\u4e8c\u4e2a\u5143\u7d20\uff0c\u5e76\u4e0d\u662f\u5728a[0]\u5143\u7d20\u7684\u9996\u5730\u5740\u4e0a\u52a01\u3002<\/p>\n
13.\u5b9a\u4e49\u4e00\u4e2a\u679a\u4e3e\u7c7b\u578b\u7684\u53d8\u91cf\uff1a<\/p>\n
\r\nenum return_value\r\n{\r\n\tRET_TURE;\r\n\tRET_FALSE;\r\n\tRET_RANDOM;\r\n}\r\n<\/pre>\n
\u679a\u4e3e\u7c7b\u578b\u4e2d\u6bcf\u4e00\u4e2a\u679a\u4e3e\u5e38\u91cf\u90fd\u662f\u7528\u6807\u793a\u7b26\u8868\u793a\u7684\u6574\u5f62\u5e38\u91cf\u3002\u4e0a\u8ff0\u679a\u4e3e\u7c7b\u578b\u4e2d\u7684\u5404\u4e2a\u679a\u4e3e\u5e38\u91cf\u5e76\u672a\u8d4b\u503c\uff0c\u4f46\u662f\u9ed8\u8ba4\u503c\u4f9d\u6b21\u4e3a0\uff0c1\uff0c2\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5728\u6b64\u8bb0\u5f55\u4e00\u4e9b\u5e38\u89c1\u7684C\u8bed\u8a00\u9519\u8bef\uff0c\u53ef\u4ee5\u5f53\u4f5c\u5b66\u4e60C\u8bed\u8a00\u7684\u7b14\u8bb0\uff0c\u9700\u8981\u7684\u65f6\u5019\u53ef\u4ee5\u56de\u8fc7\u5934\u770b\u770b\u3002 1.\u5173\u4e8e\u201c\uff0b\uff0b\u201d #inc […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[74],"tags":[114],"class_list":["post-627","post","type-post","status-publish","format-standard","hentry","category-c","tag-114"],"views":8145,"_links":{"self":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/627","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/comments?post=627"}],"version-history":[{"count":0,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/627\/revisions"}],"wp:attachment":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/media?parent=627"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/categories?post=627"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/tags?post=627"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}