{"id":29610,"date":"2023-01-09T05:11:28","date_gmt":"2023-01-08T23:41:28","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-can-someone-explain-the-meaning-of-this-scanf-code-closed\/"},"modified":"2023-01-09T05:11:28","modified_gmt":"2023-01-08T23:41:28","slug":"solved-can-someone-explain-the-meaning-of-this-scanf-code-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-can-someone-explain-the-meaning-of-this-scanf-code-closed\/","title":{"rendered":"[Solved] Can someone explain the meaning of this scanf code [closed]"},"content":{"rendered":"

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As said in remarks scanf(\"%s%c\",a[i],&ch);<\/code> try to read a ‘word’ as a string in a[i]<\/code> and a char in ch<\/em><\/p>\n

Because a ‘word’ is ended by a separator and there is no space between %s<\/em> and %c<\/em> if a character is read to set ch<\/em> that character is the first separator<\/p>\n

Example :<\/p>\n

#include <stdio.h>\n\nint main()\n{\n  char s[10], ch;\n  printf(\"%d\\n\", scanf(\"%s%c\", s, &ch));\n  printf(\"'%s' '%c' (%d)\\n\", s, ch, ch);\n}\n<\/code><\/pre>\n
Compilation and execution:<\/p>\n
pi@raspberrypi:\/tmp $ gcc s.c\npi@raspberrypi:\/tmp $ .\/a.out\naze q\n2\n'aze' ' ' (32)\n<\/code><\/pre>\n
so ch<\/em> does not get q<\/em> but the first space after “aze”<\/p>\n
Of course in the case of aze<\/em>enter<\/kbd><\/p>\n
pi@raspberrypi:\/tmp $ .\/a.out\naze\n2\n'aze' '\n' (10)\n<\/code><\/pre>\n
ch<\/em> get newline<\/em><\/p>\n
\n
The proper way to not take the risk to write out of the string is to set the max number of characters, in my example above scanf(\"%9s%c\", s, &ch)<\/code> (9 rather than 10 to have the place for the null character ending the string)<\/p>\n
If the available ‘word’ has at least 10 characters the 10nth will be get by ch<\/em> :<\/p>\n
pi@raspberrypi:\/tmp $ gcc s.c\npi@raspberrypi:\/tmp $ .\/a.out\n1234567890\n2\n'123456789' '0' (48)\n<\/code><\/pre>\n
\n
Adding a space between %s<\/em> and %c<\/em> changes the behavior because the separators are skip between the ‘word’ and the returned character, example :<\/p>\n
#include <stdio.h>\n\nint main()\n{\n  char s[10], ch;\n  printf(\"%d\\n\", scanf(\"%9s %c\", s, &ch));\n  printf(\"'%s' '%c' (%d)\\n\", s, ch, ch);\n}\n<\/code><\/pre>\n
Compilation and execution:<\/p>\n
pi@raspberrypi:\/tmp $ gcc s.c\npi@raspberrypi:\/tmp $ .\/a.out\naze    q\n2\n'aze' 'q' (113)\n<\/code><\/pre>\n
so that time ch<\/em> gets q<\/em><\/p>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            <\/span> <\/p><\/div>\n<\/div>\n
[ad_2]<\/p>\n
solved Can someone explain the meaning of this scanf code [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] As said in remarks scanf(“%s%c”,a[i],&ch); try to read a ‘word’ as a string in a[i] and a char in ch Because a ‘word’ is ended by a separator and there is no space between %s and %c if a character is read to set ch that character is the first separator Example : #include … 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":[324,2763,1148,585],"class_list":["post-29610","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-compiler-construction","tag-input","tag-scanf"],"yoast_head":"\n[Solved] Can someone explain the meaning of this scanf code [closed] - 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-can-someone-explain-the-meaning-of-this-scanf-code-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Can someone explain the meaning of this scanf code [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] As said in remarks scanf("%s%c",a[i],&ch); try to read a ‘word’ as a string in a[i] and a char in ch Because a ‘word’ is ended by a separator and there is no space between %s and %c if a character is read to set ch that character is the first separator Example : #include ... 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