{"id":576,"date":"2022-08-05T20:48:56","date_gmt":"2022-08-05T12:48:56","guid":{"rendered":"https:\/\/niuguodong.com\/?p=576"},"modified":"2025-12-14T23:29:44","modified_gmt":"2025-12-14T15:29:44","slug":"c%e6%8c%87%e9%92%88","status":"publish","type":"post","link":"https:\/\/niuguodong.com\/index.php\/2022\/08\/05\/c%e6%8c%87%e9%92%88\/","title":{"rendered":"C\u6307\u9488"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">*\u4e0econst<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>void func1(int* const p)\n{\n    *p = 0;\n    \/\/ p++; \/\/const\u4fee\u9970\u7684\u662f\u6307\u9488\u672c\u8eab\uff0c\u4e0d\u80fd\u4fee\u6539\u6307\u9488\u7684\u5730\u5740\n}\n\nvoid func2(const int* p)\n{\n    \/\/*p = 0; \/\/const\u4fee\u9970\u7684\u662f\u6307\u9488\u6240\u6307\u5411\u7684\u6570\u636e\uff0c\u4e0d\u80fd\u4fee\u6539\u6570\u636e\n    p++;\n}\n\nvoid func3(const int* const p)\n{\n    \/\/\u6307\u9488\u672c\u8eab\u548c\u6570\u636e\u90fd\u88abconst\u4fee\u9970,\u90fd\u4e0d\u80fd\u4fee\u6539\n    \/\/*p = 0;\n    \/\/ p++;\n}\n\nvoid func4(int* p)\n{\n    \/\/\u90fd\u53ef\u4ee5\u4fee\u6539\n    *p = 0;\n    p++;\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">*\u4e0e++<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">*p++<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>int main(void)\n{\n    int a&#91;10] = {100, 200, 300, 400, 500, 600, 700, 800, 900, 1000};\n    int* p = a;\n\n    printf(\"Before: a&#91;0]=%d, a&#91;1]=%d\\n\", a&#91;0], a&#91;1]);\n    printf(\"p points to address: %p\\n\", (void*)p);\n\n    int b = *p++;\/\/\u7b49\u4ef7\u4e8e int b = *(p++); \u5148\u53d6p\u6307\u5411\u7684\u503c\u8d4b\u7ed9b\uff0c\u7136\u540ep\u81ea\u589e\uff0c\u6307\u5411\u4e0b\u4e00\u4e2a\u5143\u7d20\n    printf(\"After: a&#91;0]=%d, a&#91;1]=%d\\n\", a&#91;0], a&#91;1]);\n    printf(\"b=%d\\n\", b);\n    printf(\"p points to address: %p\\n\", (void*)p);\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n<div style=\"height:19px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>\u8fd0\u884c\u7ed3\u679c<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/niuguodong.com\/wp-content\/uploads\/2022\/08\/image.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"372\" height=\"129\" data-original=\"https:\/\/niuguodong.com\/wp-content\/uploads\/2022\/08\/image.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-580\"  sizes=\"auto, (max-width: 372px) 100vw, 372px\" \/><\/div><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">++*p<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>int main(void)\n{\n    int a&#91;10] = {100, 200, 300, 400, 500, 600, 700, 800, 900, 1000};\n    int* p = a;\n\n    printf(\"Before: a&#91;0]=%d, a&#91;1]=%d\\n\", a&#91;0], a&#91;1]);\n    printf(\"p points to address: %p\\n\", (void*)p);\n\n    int b = ++*p;\/\/\u7b49\u4ef7\u4e8e int b = ++(*p); \u5148\u53d6p\u6307\u5411\u7684\u503c\u8fdb\u884c\u81ea\u589e\uff0c\u7136\u540e\u5c06\u81ea\u589e\u540e\u7684\u503c\u8d4b\u7ed9b\n    printf(\"After: a&#91;0]=%d, a&#91;1]=%d\\n\", a&#91;0], a&#91;1]);\n    printf(\"b=%d\\n\", b);\n    printf(\"p points to address: %p\\n\", (void*)p);\n}<\/code><\/pre>\n\n\n\n<div style=\"height:19px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>\u8fd0\u884c\u7ed3\u679c<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/niuguodong.com\/wp-content\/uploads\/2022\/08\/image-1.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"378\" height=\"129\" data-original=\"https:\/\/niuguodong.com\/wp-content\/uploads\/2022\/08\/image-1.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-583\"  sizes=\"auto, (max-width: 378px) 100vw, 378px\" \/><\/div><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">*++p<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>int main(void)\n{\n    int a&#91;10] = {100, 200, 300, 400, 500, 600, 700, 800, 900, 1000};\n    int* p = a;\n\n    printf(\"Before: a&#91;0]=%d, a&#91;1]=%d\\n\", a&#91;0], a&#91;1]);\n    printf(\"p points to address: %p\\n\", (void*)p);\n\n    int b = *++p;\/\/\u7b49\u4ef7\u4e8e int b = *(++p); \u5148\u8ba9p\u81ea\u589e\uff0c\u6307\u5411\u4e0b\u4e00\u4e2a\u5143\u7d20\uff0c\u7136\u540e\u53d6\u8be5\u5143\u7d20\u7684\u503c\u8d4b\u7ed9b\n    printf(\"After: a&#91;0]=%d, a&#91;1]=%d\\n\", a&#91;0], a&#91;1]);\n    printf(\"b=%d\\n\", b);\n    printf(\"p points to address: %p\\n\", (void*)p);\n}<\/code><\/pre>\n\n\n\n<div style=\"height:19px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>\u8fd0\u884c\u7ed3\u679c<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/niuguodong.com\/wp-content\/uploads\/2022\/08\/image-2.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"387\" height=\"129\" data-original=\"https:\/\/niuguodong.com\/wp-content\/uploads\/2022\/08\/image-2.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-585\"  sizes=\"auto, (max-width: 387px) 100vw, 387px\" \/><\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">*\u4e0e.<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>int main(void)\n{\n    struct Point p1 = {0, 0};\n    struct Point* p2 = &amp;p1;\n\n    \/\/ *p2.x = 30; \/\/ \u9519\u8bef\u7528\u6cd5, .\u8fd0\u7b97\u7b26\u4f18\u5148\u7ea7\u9ad8\u4e8e*\n    (*p2).x = 10; \/\/ \u6b63\u786e\u7528\u6cd5\n    p2->y = 20; \/\/ \u6b63\u786e\u7528\u6cd5\n    printf(\"p1.x=%d, p1.y=%d\\n\", p1.x, p1.y);\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n<div style=\"height:19px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>\u8fd0\u884c\u7ed3\u679c<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/niuguodong.com\/wp-content\/uploads\/2022\/08\/image-3.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"193\" height=\"26\" data-original=\"https:\/\/niuguodong.com\/wp-content\/uploads\/2022\/08\/image-3.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-589\"\/><\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>*\u4e0econst *\u4e0e++ *p++ \u8fd0\u884c\u7ed3\u679c ++*p \u8fd0\u884c\u7ed3\u679c *++p \u8fd0\u884c\u7ed3\u679c *\u4e0e. \u8fd0\u884c\u7ed3\u679c<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[13,5],"tags":[],"class_list":["post-576","post","type-post","status-publish","format-standard","hentry","category-c","category-5"],"_links":{"self":[{"href":"https:\/\/niuguodong.com\/index.php\/wp-json\/wp\/v2\/posts\/576","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/niuguodong.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/niuguodong.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/niuguodong.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/niuguodong.com\/index.php\/wp-json\/wp\/v2\/comments?post=576"}],"version-history":[{"count":0,"href":"https:\/\/niuguodong.com\/index.php\/wp-json\/wp\/v2\/posts\/576\/revisions"}],"wp:attachment":[{"href":"https:\/\/niuguodong.com\/index.php\/wp-json\/wp\/v2\/media?parent=576"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/niuguodong.com\/index.php\/wp-json\/wp\/v2\/categories?post=576"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/niuguodong.com\/index.php\/wp-json\/wp\/v2\/tags?post=576"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}