{"id":13885,"date":"2022-10-05T17:55:38","date_gmt":"2022-10-05T12:25:38","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-build-code-strlwr-by-pointer-duplicate\/"},"modified":"2022-10-05T17:55:38","modified_gmt":"2022-10-05T12:25:38","slug":"solved-build-code-strlwr-by-pointer-duplicate","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-build-code-strlwr-by-pointer-duplicate\/","title":{"rendered":"[Solved] Build code: “strlwr” by pointer [duplicate]"},"content":{"rendered":"

[ad_1]
\n<\/p>\n

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The first example:<\/p>\n

char *s1 =\"Con Chim Non\";\n<\/code><\/pre>\n
You declare a pointer<\/em> to a text literal, which is constant. Text literals cannot be modified.<\/strong>  <\/p>\n
The proper syntax is:  <\/p>\n
char const * s1 = \"Con Chim Non\";\n<\/code><\/pre>\n
Note the const<\/code>.  <\/p>\n
In your second example, you are declaring, reserving memory for 100 characters in dynamic<\/strong> memory:  <\/p>\n
char *s=new char[100];\ngets(s);\n<\/code><\/pre>\n
You are then getting an unknown amount<\/strong> of characters from the input and placing them into the array.  <\/p>\n
Since you are programming in the C++ language, you should refrain from this kind of text handling and use the safer std::string<\/code> data type.  <\/p>\n
For example, the gets<\/code> function will read an unknown amount of characters from the console into an array.  If you declare an array of 4 characters and type in 10, you will have a buffer overflow<\/code>, which is very bad<\/strong>.<\/p>\n
The std::string<\/code> class will expand as necessary to contain the content.  It will also manage memory reallocation.  <\/p>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            <\/span> <\/p><\/div>\n<\/div>\n
[ad_2]<\/p>\n
solved Build code: “strlwr” by pointer [duplicate] <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] The first example: char *s1 =”Con Chim Non”; You declare a pointer to a text literal, which is constant. Text literals cannot be modified. The proper syntax is: char const * s1 = “Con Chim Non”; Note the const. In your second example, you are declaring, reserving memory for 100 characters in dynamic memory: … 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":[324,992,1159],"class_list":["post-13885","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-visual-c","tag-visual-studio-2010"],"yoast_head":"\n[Solved] Build code: "strlwr" by pointer [duplicate] - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-build-code-strlwr-by-pointer-duplicate\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Build code: "strlwr" by pointer [duplicate] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] The first example: char *s1 ="Con Chim Non"; You declare a pointer to a text literal, which is constant. Text literals cannot be modified. The proper syntax is: char const * s1 = "Con Chim Non"; Note the const. In your second example, you are declaring, reserving memory for 100 characters in dynamic memory: ... 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