{"id":17540,"date":"2022-10-25T12:37:53","date_gmt":"2022-10-25T07:07:53","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-what-is-the-difference-between-these-char-duplicate\/"},"modified":"2022-10-25T12:37:53","modified_gmt":"2022-10-25T07:07:53","slug":"solved-what-is-the-difference-between-these-char-duplicate","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-what-is-the-difference-between-these-char-duplicate\/","title":{"rendered":"[Solved] What is the difference between these? (char) [duplicate]"},"content":{"rendered":"

[ad_1]
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\"blah\"<\/code> is a const char [5]<\/code>. In the first line, that array is decayed into a pointer to be stored in your variable as a pointer to the first element. It is also a pointer to non-const characters that points to const characters. It should be:<\/p>\n

const char *sz1 = \"blah\";\n<\/code><\/pre>\n
In the second (thanks jrok), it creates an actual array and initializes it with {'b', 'l', 'a', 'h', '\\0'}<\/code>. <\/p>\n
char *sz3 = new char[512];\n<\/code><\/pre>\n
This allocates 512 * sizeof (char)<\/code> bytes of memory for the chars and sz3<\/code> will point to the beginning. This is stored on the heap, as opposed to the stack, so don’t forget to delete[]<\/code> it.<\/p>\n
char *sz4[512] = { 0, };\n<\/code><\/pre>\n
This creates an array of 512 pointers to characters and initializes them all to 0 (NULL). The comma isn’t needed, it’s just easier to add onto the initializer list afterwards. The spiral rule<\/a> can be used here to determine sz4 is an array of 512 (one right) pointers (one left) to char (two left)<\/code>.<\/p>\n
char sz5[512];\n<\/code><\/pre>\n
This creates an array (on the stack) of 512 characters.<\/p>\n
All but the second-last can effectively be replaced with std::string<\/code>. <\/p>\n<\/p><\/div>\n
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            2<\/span> <\/p><\/div>\n<\/div>\n
[ad_2]<\/p>\n
solved What is the difference between these? (char) [duplicate] <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] “blah” is a const char [5]. In the first line, that array is decayed into a pointer to be stored in your variable as a pointer to the first element. It is also a pointer to non-const characters that points to const characters. It should be: const char *sz1 = “blah”; In the second … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[361,324,472,712],"class_list":["post-17540","post","type-post","status-publish","format-standard","hentry","category-solved","tag-arrays","tag-c","tag-char","tag-pointers"],"yoast_head":"\n[Solved] What is the difference between these? 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