Fgets reads last line twice

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August undefined, 2024

WebMar 25, 2010 · The net effect of this is that you process the last line in the file twice. Some simple solutions would be to either put the feof test immediately after the fgets call instead of before it, or to test the return result of the fgets call … WebOct 26, 2014 · I don't want the last line to be printed or written twice , what am I doing wrong , help! !feof (f1) is wrong. EOF will be one more loop after reading the last line from …

input - Have to hit enter twice with fgets() in C? - Stack Overflow

WebJul 1, 2016 · However, beyond about 1/4 gigabytes it gets pretty slow; I have had it working on reading 1.2 gigabytes for several minutes now, and the time it is taking leaves me wondering whether the internals are growing the array dynamically with lots of copying (rather than, for example, scanning ahead to determine how far away the line terminator … WebJan 21, 2024 · In my C program, I call fgets () twice to get input from the user. However, on the second call of fgets () (which is in a function), it doesn't wait for the input to be taken, … how much is huge mimic chest worth

Prevent the loop from reading the last file line twice - C

WebNov 19, 2024 · If you have an empty line (i.e. just a new line), then fscanf (infile, "% [^\n]", line) will not read in anything into line, and line remains unchanged (i.e. has the value of … WebJan 17, 2014 · 19. In your case, the last line is seemingly read twice, except that it isn't. The last call to fgets returns NULL to indicate the the end of file has been read. You … Webyes ..last line. jephthah 1,888. 13 Years Ago. okay, then you do this: (1) open the file using "fopen". (2) use a while loop to read each line into a string buffer using "fgets" until a NULL is returned. (3) when fgets returns a NULL, it means there are no more lines. the last line read will still be in your string buffer. how do graphic designers help people

c - Final Line of a Text File is Printed Twice - Stack Overflow

While loop in C Language with feof condition and fgets elaborate twice …

WebNov 7, 2024 · fgets () will fail and return NULL before feof (file) becomes true, and it won't update string. So right now you're successfully calling fgets () on the last line, printing it, unsuccessfully calling fgets (), printing the last line again, then terminating your loop. WebLast line of file being read twice I'm getting back to C programming and decided to try to write a code that reads a file with multiple ints inside and counts how many of them have values that range in a certain amount. But for some reason the code reads the last line twice and counts 1 more int than its supposed to. How can I fix that? how do graphene sensors workWebApr 20, 2014 · The loop runs twice because when you enter a non- q character, you actually enter two characters - the non- q character and the newline '\n' character. x = getc (stdin); reads the non- q character from the stdin stream but the newline is still lying in the buffer of stdin which is read in the next getc call. You should use fgets to read a line ... how much is huge mrs claws worth

"WebNov 16, 2024 · The fgets() and fgetws() functions are typically used to read a newline-terminated line of input from a stream. Both functions read at most one less than the number of narrow or wide characters specified by an argument n from a stream to a string. Truncation errors can occur if n - 1 is less than the number of characters appearing in the … " - Fgets reads last line twice

Fgets reads last line twice

C Read Character String from keyboard via fgets() - demo2s.com

WebAug 7, 2011 · Here's one way: if ( ($line = fgets (...)) !== false) { if (meets_criteria ($line)) { b ($line); } else { a ($line); }; while ( ($line = fgets (...)) !== false) { a ($line); }; }; Feel …

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WebI know it only reads the last line as I have done various tests, seeing if it could find a substring and it can only find it if it's on the last line. CODE: //Input FILE *ptr_file; //fclose … WebThe fgets () function fixes the possible overflow problem by taking a second argument that limits the number of characters to be read. This function is designed for file input, which makes it a little more awkward to use. It takes a second argument indicating the maximum number of characters to read. If this argument has the value n, fgets ...

WebJan 28, 2024 · Based on the explanation of fgets, it seems that fgets should stop whenever it reads n-1 characters, hit the EOF or hit a newline character. For example, I create a … WebJan 21, 2024 · 1 Answer Sorted by: 4 fgets (str, 2, stdin); You're providing too little space for fgets. You only allow it to read one character (since 2 includes the 0-terminator). The newline will always be left in the input buffer so the next stdio operation will read it. Share Improve this answer Follow answered Feb 25, 2012 at 15:39 cnicutar 177k 25 360 391

WebNov 7, 2024 · while ( fgets(string, 30, file) != NULL ) { printf("%s", string); } fgets() will fail and return NULL before feof(file) becomes true, and it won't update string. So right now … WebJan 28, 2024 · Based on the explanation of fgets, it seems that fgets should stop whenever it reads n-1 characters, hit the EOF or hit a newline character. For example, I create a text file like below: red 100 yellow 400 blue 300 green 500 purple 1000 ... The color and the integer is separated by a tab.

WebJun 19, 2003 · Also, you should check to make sure you dont have an empty string after fgets (). This can indicate either an empty line or eof, so check Nick Johnson XMN …

WebNov 17, 2013 · The last line of the original file shows duplicated in the new file. In the example given: data.txt. line1 line2 line3 line4 line5. The line5 (last line of the original file) … how do grape vines growWebfgets(buf, MAXLINE, infp); fputs(buf, outfp);} copy the last line twice? A: In C, end-of-file is only indicated *after* an input routine has tried to read, and failed. (In other words, C's … how do graphic novels keep a child\u0027s interestWebOct 29, 2024 · In reply to Neddy:. Hi this is a description on how to read from binary files. It has some examples on how to use EOF. I hope it helps. Below the example for reading from a binary file with systemverilog.. As shown in IEEE SV Standard documentation, the "nchar_code" will return the number of bytes/chars read. In case EOF have been already … how do grants differ from loansWebHey guys I'm having a problem with fgets(). It is only reading the last line of my program. So I am getting incorrect data with the fgets. I am trying to store a substring from that file. (Makes sense? :/) I know it only reads the last line as I have done various tests, seeing if it could find a substring and it can only find it if it's on the ... how do graphic scales workWebApr 1, 2013 · you have to remove the \n from the string format of the scanf.It should be. scanf("%s",a); EDIT: Explanation. the %s means that the scanf reads the input character till it gets a delimiter which should be a white space like space or tab or new line(\n) so the first enter is get as a delimiter for the "%s" and adding the "\n" to the string format "%s\n" … how do graphic designers make moneyWeb《C Primer Plus》读书笔记. 1.字符串的拼接使用c的函数char *strcat(char *str_des, char *str_sou); 将字符串str_sou接在字符串str_des后面（放在str_des的最后字符和“\0”之间）。注意不要越界，可用strlen(input)函数求字符串长度之后再拼接。2. 字符串的分割使用c的函数 char *strtok(char *str_sou,constchar *str_sep); str_sou ... how do graphic designers showcase their workWebThis problem results in the last line being printed twice. Now, with the various code and compilers I've tried, I've seen varying results when using this poor quality code. ... this time checking the return code from fgets() to determine when the read fails. The code is exactly the same, except for the loop. #include #include how much is huge mrs claws worth in psx