{"id":182,"date":"2022-03-03T23:42:34","date_gmt":"2022-03-03T15:42:34","guid":{"rendered":"https:\/\/blog.lickoo.fun\/?p=182"},"modified":"2022-03-19T15:06:10","modified_gmt":"2022-03-19T07:06:10","slug":"%e8%80%81%e6%9d%8e%e3%81%aec%e6%8c%87%e9%92%88%e5%a4%8d%e4%b9%a0%e7%ac%94%e8%ae%b0","status":"publish","type":"post","link":"https:\/\/blog.lickoo.fun\/?p=182","title":{"rendered":"\u8001\u674e\u306eC++\u6307\u9488\u590d\u4e60\u7b14\u8bb0"},"content":{"rendered":"\n

\u7528\u5904\u3001\u5982\u4f55\u5b9a\u4e49\uff1f<\/h2>\n\n\n\n

\u521b\u5efa\u6570\u636e\u7ed3\u6784\u3001\u52a8\u6001\u5206\u914d\u5185\u5b58\u3001\u62e6\u622a\u8f6f\u4ef6\u8fdb\u7a0b\u7b49\u3002<\/p>\n\n\n\n

\u5b9a\u4e49\u65b9\u6cd5\uff1atype *var-name; \u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0c\u5728\u5b9a\u4e49\u65f6*\u7684\u4f4d\u7f6e\u53ef\u4ee5\u8d34\u5728type\u5904\uff0c\u6548\u679c\u662f\u4e00\u6837\u7684\uff0c\u4e3a\u4e86\u65b9\u4fbf\u7406\u89e3\uff0c\u6211\u4eec\u4e0b\u9762\u5c06\u6240\u6709\u7684\u5b9a\u4e49\u90fd\u8d34\u5728type\u5904<\/p>\n\n\n\n

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

int* a; \/\/\u7b49\u4ef7\u4e8eint *a;\nchar* c = NULL;\ndouble* dd = # \/\/\u6b64\u5904\u7684num\u4e3a\u4e8b\u5148\u58f0\u660e\u597d\u7684double\u7c7b\u578b\u53d8\u91cf\nstruct node* newNode; \/\/\u7ed3\u6784\u4f53\u7c7b\u578b\u7684\u6307\u9488<\/code><\/pre>\n\n\n\n
& \u53d6\u5730\u5740\u7b26\u53f7<\/h2>\n\n\n\n
\u4f5c\u7528\uff1a\u7528\u6765\u5f97\u5230\u67d0\u4e2a\u6570\u636e\u6240\u5b58\u653e\u7684\u5730\u5740\u3002<\/p>\n\n\n\n
\u793a\u4f8b\uff1a<\/p>\n\n\n\n
#include <iostream>\nusing namespace std;\n\nint main()\n{\n int a = 0;\n char c;\n cout << &a << endl << &c << endl;\n return 0;\n}<\/code><\/pre>\n\n\n\n
* \u89e3\u5f15\u7528\u7b26\u53f7<\/h2>\n\n\n\n
\u4f5c\u7528\uff1a\u89e3\u6790\u5730\u5740\u5bf9\u5e94\u7684\u6570\u636e<\/p>\n\n\n\n
\u793a\u4f8b\uff1a<\/p>\n\n\n\n
#include <iostream>\nusing namespace std;\n\nint main()\n{\n int a = 0;\n int* p = &a;  \/\/\u6ce8\u610f\uff0c\u6b64\u5904\u7684*\u4e3a\u58f0\u660eint\u7c7b\u578b\u6307\u9488\u53d8\u91cf\u7684\u7b26\u53f7\uff0c\u4e0d\u662f\u89e3\u5f15\u7528\u7b26\u53f7\n *p = 1;  \/\/\u6b64\u5904\u7684*\u4e5f\u4e3a\u89e3\u5f15\u7528\n cout << *p << endl;  \/\/\u6b64\u5904\u7684*\u4e3a\u89e3\u5f15\u7528\u7b26\u53f7\n return 0;\n}<\/code><\/pre>\n\n\n\n
\u91cd\u8981\u7684\u6982\u5ff5<\/h2>\n\n\n\n
  • \u5728\u6b64\uff0c\u53ef\u4ee5\u4e0d\u4e25\u8c28\u5730\u8ba4\u4e3a\u6307\u9488=\u5730\u5740<\/li>
  • \u6307\u9488\u53d8\u91cf\u662f\u7528\u6765\u5b58\u653e\u6307\u9488\u7684\u53d8\u91cf\uff0c\u4e0d\u80fd\u5b58\u653e\u5176\u4ed6\u6570\u636e\u7c7b\u578b\u3002\u6bd4\u5982\u7528&\u5bf9\u67d0\u4e2a\u53d8\u91cf\u53d6\u503c\u4e4b\u540e\u5f97\u5230\u5b83\u7684\u5730\u5740\uff0c\u624d\u53ef\u4ee5\u8fdb\u884c\u5b58\u653e\u3002<\/li>
  • \u8981\u6ce8\u610f\u7684\u662f\uff0c\u6bd4\u5982\u6307\u9488\u4e5f\u662f\u6709\u7c7b\u578b\u7684\uff0c\u6bd4\u5982int\u7c7b\u578b\u7684\u6307\u9488\u53d8\u91cf\u53ea\u80fd\u5b58\u50a8int\u6570\u636e\u7c7b\u578b\u7684\u5730\u5740\uff0c\u800c\u4e0d\u80fd\u5b58\u50a8char\u7c7b\u578b\u7684\u5730\u5740\uff0c\u56e0\u4e3a\u4e0d\u540c\u7684\u6570\u636e\u7c7b\u578b\u6240\u5360\u7684\u5185\u5b58\u5927\u5c0f\u662f\u4e0d\u4e00\u6837\u7684\u3002<\/li>
  • \u89e3\u5f15\u7528*\u53ef\u4ee5\u8ba4\u4e3a\u662f\u6307\u9488\u6307\u5411\u7684\u5730\u5740\u7684\u4f4d\u7f6e\u5411\u540e\u9762\u51e0\u4e2a\u4f4d\u8fde\u8d77\u6765\u8bfb\u503c<\/li><\/ul>\n\n\n\n
    \u7a7a\u6307\u9488NULL<\/h2>\n\n\n\n
    \u8981\u662f\u6211\u6ca1\u8bb0\u9519\u7684\u8bdd\uff0c\u5728iostream\u8fd9\u4e2a\u5934\u6587\u4ef6\u91cc\u9762\u6709\u5b9a\u4e49#define NULL 0<\/p>\n\n\n\n
    \u56e0\u6b64\u6709\u4e00\u4e2a\u7b80\u5355\u7684\u7528\u6cd5\uff0c\u53ef\u4ee5\u7528\u6765\u68c0\u6d4b\u6307\u9488\u662f\u5426\u4e3a\u7a7a<\/p>\n\n\n\n
    if (ptr){}\n\/\/\u6b64\u5904\u7684ptr\u4e3a\u4e00\u4e2a\u6307\u9488\uff0c\u53ef\u4ee5\u901a\u8fc7\u6307\u9488\u662f\u5426\u4e3a\u7a7a\u6765\u6267\u884cif\u8bed\u53e5<\/code><\/pre>\n\n\n\n
    \u6307\u9488\u7684\u8fd0\u7b97 ++ — + –<\/h2>\n\n\n\n
    • \u6307\u9488++\u8868\u793a\u5411\u4e0b\u79fb\u52a8\u4e00\u4e2a\u5185\u5b58\u4f4d\u7f6e\uff0c\u6bd4\u5982\u4e00\u4e2aint\u4e3a4\u5b57\u8282\uff0c\u4e00\u4e2aint\u7c7b\u578b\u7684\u6307\u9488\u7684\u503c++\u4e00\u6b21\u5c31\u81ea\u589e32\uff08\u4e00\u5b57\u8282\u662f8\u4f4d\uff09\uff0c\u6307\u5411\u7684\u5185\u5b58\u4f4d\u7f6e\u5f80\u540e\u632a\u52a832\u4f4d\u3002\u540c\u7406\uff0c\u4e00\u4e2achar\u7c7b\u578b\u7684\u6307\u9488++\u4e00\u6b21\u5c31\u5f80\u540e\u632a8\u4f4d<\/li>
    • –\u548c++\u4e3a\u76f8\u53cd\u64cd\u4f5c\uff0c\u4e0d\u591a\u8d58\u8ff0<\/li><\/ul>\n\n\n\n
      +\u548c-\u5373\u4e3a\u5411\u524d\u632a\u52a8\u6216\u5411\u540e\u632a\u52a8\u82e5\u5e72\u4e2a\u5355\u4f4d\uff0c\u4f8b\u5982\uff1a<\/p>\n\n\n\n
      #include <iostream>\nusing namespace std;\n\nint main()\n{\n int var[3] = {1,2,3};\n int* ptr = var;\n ptr + 2;\n cout << *ptr << endl;\n return 0;\n}<\/code><\/pre>\n\n\n\n
      #include <>iostream>\nusing namespace std;\n\nint main()\n{\n int* ptr = NULL;  \/\/\u58f0\u660e\u6307\u9488\u7684\u65f6\u5019\u7ed9\u5b83\u8d4b\u7a7a\u503c\u662f\u4e2a\u597d\u4e60\u60ef\n int var[3] = {100,200,300};\n ptr = var;  \/\/\u6570\u7ec4\u540d\u5c31\u662f\u4e00\u4e2a\u5730\u5740\uff0c\u6307\u5411\u6570\u7ec4\u7684\u9996\u5730\u5740\uff0c\u662f\u4e00\u4e2a\u5e38\u91cf\n cout << *ptr << endl;\n cout << ptr << endl;\n ptr++;\n cout << *ptr << endl;\n cout << ptr << endl;\n ptr++;\n cout << *ptr << endl;\n cout << ptr << endl;\n ptr++;\n cout << *ptr << endl;\n cout << ptr << endl;\n ptr--;\n cout << *ptr << endl;\n cout << ptr << endl;\n endl;\n}<\/code><\/pre>\n\n\n\n
      \u6307\u9488\u7684\u6bd4\u8f83<\/h2>\n\n\n\n
      \u4f17\u6240\u5468\u77e5\uff0c\u5730\u5740\u662f16\u8fdb\u5236\u7684\u503c\uff0c\u65e2\u7136\u662f\u503c\u5c31\u53ef\u4ee5\u8fdb\u884c\u6bd4\u8f83<\/p>\n\n\n\n
      \u7b26\u53f7\uff1a> < ==<\/p>\n\n\n\n
      \u793a\u4f8b\u7a0b\u5e8f\uff08\u904d\u5386\u6570\u7ec4\uff09\uff1a<\/p>\n\n\n\n
      #include <iostream>\nusing namespace std;\n#define max 4\n\nint main()\n{\n int var[max] = {1,2,3,4};\n int* ptr = var;\n while(ptr <= &var[max - 1])  \/\/\u6570\u7ec4\u7684\u53d6\u503c\u8303\u56f4\u4e3a0~3\uff0c\u6b64\u5904\u5e94-1\n {\n cout << *ptr << endl;\n ptr++;\n }\n return 0;\n}<\/code><\/pre>\n\n\n\n
      \u6307\u9488\u8bbf\u95ee\u6570\u7ec4<\/h2>\n\n\n\n
      \u5982\u524d\u6240\u8ff0\uff0c\u6570\u7ec4\u540d\u4e3a\u6570\u7ec4\u7684\u9996\u5730\u5740\uff0c\u6545\u53ef\u4ee5\u901a\u8fc7\u6307\u9488\u5bf9\u6570\u7ec4\u8fdb\u884c\u64cd\u4f5c<\/p>\n\n\n\n
      \u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u6570\u7ec4\u540d\u662f\u4e00\u4e2a\u5730\u5740\u5e38\u91cf\uff0c\u4e0d\u53ef\u8fdb\u884c++\u3001–\u8fd0\u7b97\uff0c\u4f46\u662f\u53ef\u4ee5\u8fdb\u884c+\u3001-\u8fd0\u7b97<\/p>\n\n\n\n
      \u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n\n\n\n
      #include <iostream>\nusing namespace std;\n\nint main()\n{\n int var[4];\n int* ptr = var;\n *ptr = 1;\n *(ptr + 1) = 2;\n *(ptr + 2) = 3;\n *(ptr + 3) = 4;  \/\/ *(ptr + 3) = 4;  \/\/\u7528\u6307\u9488\u5bf9\u6570\u7ec4\u8fdb\u884c\u8d4b\u503c\n while(ptr <= (ptr + 3))\n {\n cout << *ptr << endl;\n ptr++;\n } \/\/\u7528\u6307\u9488\u904d\u5386\u6570\u7ec4\n return 0;\n}<\/code><\/pre>\n\n\n\n
      \u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u6570\u7ec4\u540d\u662f\u4e00\u4e2a\u5730\u5740\u5e38\u91cf\uff0c\u4e0d\u53ef\u8fdb\u884c++\u3001–\u8fd0\u7b97\uff0c\u4f46\u662f\u53ef\u4ee5\u8fdb\u884c+\u3001-\u8fd0\u7b97<\/p>\n\n\n\n
      #include <iostream>\nusing namespace std;\nconst int MAX = 3;\n\nint main ()\n{\n int  var[MAX] = {10, 100, 200};\n for (int i = 0; i < MAX; i++)\n {\n *var = i;    \/\/ \u8fd9\u662f\u6b63\u786e\u7684\u8bed\u6cd5\n var++;       \/\/ \u8fd9\u662f\u4e0d\u6b63\u786e\u7684<\/code><\/pre>\n\n\n\n
      \u53cc\u91cd\u6307\u9488<\/h2>\n\n\n\n
      \u7b80\u5355\u5730\u8bf4\uff0c\u53cc\u91cd\u6307\u9488\u751a\u81f3\u591a\u91cd\u6307\u9488\u5c31\u662f\u5bf9\u6307\u9488\u7684\u64cd\u4f5c\u8fdb\u884c\u5957\u5a03<\/p>\n\n\n\n
      \u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n\n\n\n
      #include <iostream>\nusing namespace std;\n\nint main ()\n{\n int  var;\n int  *ptr;\n int  **pptr;\n var = 3000;\n \/\/ \u83b7\u53d6 var \u7684\u5730\u5740\n ptr = &var;\n \/\/ \u4f7f\u7528\u8fd0\u7b97\u7b26 & \u83b7\u53d6 ptr \u7684\u5730\u5740\n pptr = &ptr;\n \/\/ \u4f7f\u7528 pptr \u83b7\u53d6\u503c\n cout << \"var \u503c\u4e3a :\" << var << endl;\n cout << \"*ptr \u503c\u4e3a:\" << *ptr << endl;\n cout << \"**pptr \u503c\u4e3a:\" << **pptr << endl;\n return 0;\n}<\/code><\/pre>\n\n\n\n
      \u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n\n\n\n
      <\/p>var \u503c\u4e3a :3000
      *ptr \u503c\u4e3a:3000
      **pptr \u503c\u4e3a:3000<\/cite><\/blockquote>\n\n\n\n
      \u4f20\u9012\u6307\u9488\u7ed9\u51fd\u6570<\/h2>\n\n\n\n
      \u6211\u4eec\u90fd\u77e5\u9053\uff0c\u7ed9\u4e00\u4e2a\u51fd\u6570\u4f20\u9012\u666e\u901a\u6570\u636e\u7c7b\u578b\u7684\u5f62\u53c2\u65f6\uff0c\u7cfb\u7edf\u4f1a\u5728\u5185\u5b58\u4e2d\u5f00\u8f9f\u4e00\u6bb5\u4e34\u65f6\u7684\u7a7a\u95f4\uff0c\u7528\u6765\u5b58\u653e\u62f7\u8d1d\u8fc7\u6765\u7684\u6570\u636e\uff0c\u5728\u51fd\u6570\u5185\u8fd0\u7b97\u4e4b\u540e\u8fdb\u884c\u9500\u6bc1\uff0c\u8fd9\u5c31\u610f\u5473\u7740\u5b9e\u53c2\uff08\u5373\u88ab\u62f7\u8d1d\u7684\u6e90\u6570\u636e\uff09\u5e76\u4e0d\u4f1a\u53d1\u751f\u6539\u53d8<\/p>\n\n\n\n
      \u4f7f\u7528\u6307\u9488\u6765\u8fdb\u884c\u51fd\u6570\u64cd\u4f5c\uff0c\u5728\u51fd\u6570\u5185\u90e8\u64cd\u4f5c\u7684\u6570\u636e\u5373\u4e3a\u6307\u9488\u6307\u5411\u7684\u6570\u636e\uff0c\u5373\u4f1a\u4fee\u6539\u51fd\u6570\u4e4b\u5916\u7684\u6570\u636e<\/p>\n\n\n\n
      \u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n\n\n\n
      #include <iostream>\n#include <ctime>\nusng namespace std;\n\nvoid getsecond(unsigned long* s)\n{\n *s = time(NULL);  \/\/\u4f7f\u7528\u89e3\u5f15\u7528\u5bf9\u6307\u9488\u6307\u5411\u7684\u503c\u8fdb\u884c\u4fee\u6539\n return;\n}\n\nint main()\n\n{\n unsigned long sec;\n getSeconds(&sec);  \/\/\u4f20\u53c2\uff0c\u5c06sec\u7684\u5730\u5740\u4f20\u5165\n while(1)\n cout << \"\u5f53\u524d\u7684\u79d2\u6570:\" << sec << endl;\n return 0;\n}<\/code><\/pre>\n\n\n\n
      \u4f20\u9012\u6570\u7ec4\u6307\u9488\u7ed9\u51fd\u6570\uff1a<\/strong><\/p>\n\n\n\n
      \u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n\n\n\n
      #include <iostream>\nusing namespace std;\n\ndouble get_avg(int* arr,int size)\n{\n int temp = size;\n int sum = 0;\n while(size > 0)\n sum += *(arr + size);\n return sum \/ temp;\n}\n\nint main()\n{\n int[5] = {1,2,3,4,5};\n\n cout << get_avg(&test,5);\n return 0;\n}<\/code><\/pre>\n\n\n\n
      \u51fd\u6570\u8fd4\u56de\u6307\u9488<\/h2>\n\n\n\n
      C++\u4e0d\u652f\u6301\u8fd4\u56de\u51fd\u6570\u5185\u5c40\u90e8\u53d8\u91cf\u7684\u5730\u5740\u5230\u51fd\u6570\u5916\uff0c\u9664\u975e\u5b9a\u4e49\u4e3astatic\u6216\u8005new\u5230\u5806\u533a<\/p>\n\n\n\n
      \u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n\n\n\n
      #include <iostream>\n#include <ctime>\n#include <cstdlib>\nusing namespace std;\n\nint* GetRandom()\n\n{\n static r[10];\n srand((unsigned)time(NULL));  \/\/\u8bbe\u7f6e\u65f6\u95f4\u4e3a\u79cd\u5b50\n for(int i = 0;i < 10;i++)  \/\/\u6b64\u5904\u7684i++\u548c++i\u5bf9\u7a0b\u5e8f\u662f\u5426\u6709\u5f71\u54cd\uff1f\n r[i] = rand();\n return r;\n}\n\nint main()\n{\n int* p = NULL;\n p = GetRandom();\n for(int i = 0;i < 10;i++)\n cout << \"*(p + \" << i << \"):\" << *(p + i) << endl;\n return 0;\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
      \u7528\u5904\u3001\u5982\u4f55\u5b9a\u4e49\uff1f \u521b\u5efa\u6570\u636e\u7ed3\u6784\u3001\u52a8\u6001\u5206\u914d\u5185\u5b58\u3001\u62e6\u622a\u8f6f\u4ef6\u8fdb\u7a0b\u7b49\u3002 \u5b9a\u4e49\u65b9\u6cd5\uff1atype *var-name; \u503c\u5f97 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[6],"tags":[],"_links":{"self":[{"href":"https:\/\/blog.lickoo.fun\/index.php?rest_route=\/wp\/v2\/posts\/182"}],"collection":[{"href":"https:\/\/blog.lickoo.fun\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.lickoo.fun\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.lickoo.fun\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.lickoo.fun\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=182"}],"version-history":[{"count":9,"href":"https:\/\/blog.lickoo.fun\/index.php?rest_route=\/wp\/v2\/posts\/182\/revisions"}],"predecessor-version":[{"id":228,"href":"https:\/\/blog.lickoo.fun\/index.php?rest_route=\/wp\/v2\/posts\/182\/revisions\/228"}],"wp:attachment":[{"href":"https:\/\/blog.lickoo.fun\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=182"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.lickoo.fun\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=182"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.lickoo.fun\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=182"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}