Fgets reads last line twice

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WebMay 14, 2024 · The reason you have to press enter again after the input is likely due to this: while ( (ch = getchar ()) != '\n' && ch != EOF); fgets already read the newline so you … 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 …

file - C fscanf reading the same line twice? - Stack Overflow

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 … help cool down laptop

fgets () reads and stores a char form a line twice

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 … 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 … Web《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 ... lamb shanks in clay pot

c - Fgets() only able to read one line (last line) - Stack …

Using fgets() to read multiple lines. How to go to the Next line?

WebThe 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 … WebEDIT: to clarify fgets IS reading one line at a time, not reading the whole file at once - it reads one line at a time, the while loop runs, but then once the end of the file is reached it immediately loops back to the start of the file and reads one line at a time again. help copays act 118Webfgets(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 … help cool your cpu

"WebJul 22, 2005 · sometime reads the last line twice. Can anyone please tell me why this is happenning? This is kind of urgent so your speedy help will be greatly appreciated. … " - Fgets reads last line twice

Fgets reads last line twice

input - C Programming - Calling fgets() twice? - Stack Overflow

WebApr 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 ... WebThis 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

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WebNov 29, 2013 · You have to do this (as for your question) int n2=0; int n3=0; sync = fopen ("database.txt", "r"); if ( sync ) { while ( fgets (line, 1024, sync) !=NULL ) { // Just search for the latest line, do nothing in the loop } printf ("Last line %s\n", line); // WebOct 16, 2013 · A terminating null byte ('\0') is stored after the last character in the buffer. When you want to compare line , before you need to remove \n before null byte. If you …

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 … 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?

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 … 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 …

WebOct 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 …

WebOct 18, 2024 · The newline is read in a second fgets call. Using #define NUMLEN 30 would provide a large enough buffer to read the digits and the newline in one fgets call. Using !feof (fp) as the while condition can be a problem. When the last line is read there is no error so the loop iterates again. Instead use fgets as the while condition. help cookstore.caWebNov 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. lamb shanks in slow cookerWebNov 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 … help coordinated.comWebyes ..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. lamb shanks in a slow cooker recipesWebHey 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 ... help copd naturallyWebAug 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 … help copd breathingWebJan 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, … help copeinfo.org