2024 Fgets reads last line twice

Fgets reads last line twice

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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) … 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 …

Solved: fgets reads the last line twice Experts Exchange

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 ... 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 … road bike cheap

c - Why does scanf ask twice for input when there

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 … 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. 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 snapchat link scam

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

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

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 … 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 … road bike clearance salesWebMar 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 … road bike clearance sale usa

"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 … " - Fgets reads last line twice

Fgets reads last line twice

c - Why does scanf ask twice for input when there

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. …

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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 … 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 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 … WebOct 7, 2014 · Even though my text editor displayed it as one line after another, there was an extra newline character in between the lines so I had to backspace every line. Also, I don't understand how this is a duplicate question... this seems pretty different and the answer to the other question did not help me at all

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. 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.

WebMay 4, 2016 · So, I used fgets() to read this line of integers and store it in a char str []. As expected str [0] == 17, but str [1] == 7, an so on... every 2 digits the integer is stored in …

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. snapchat location terms and conditionsWebJan 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, … road bike clothing clearanceWebMay 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 … roadbike chrome forksWebOct 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 … road bike chain toolWebApr 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 ... road bike cleats and pedalsWebNov 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 … snapchat logicielWebMay 26, 2024 · Fgets in C++ repeats last line. FILE* soubor; char buffer [100]; soubor = fopen ("file","r"); string outp = ""; while (! feof (soubor)) { fgets (buffer,100,soubor); fputs (buffer , stdout); } fclose (soubor); it repeats last line of file twice. I have this … road bike clothing brands