how eof works in c?
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The value of EOF is -1 because it has to be different from any return value from getchar that is an actual character. So getchar returns any character value as an unsigned char, converted to int, which will therefore be non-negative. ... EOF will be false, and the loop will terminate.
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The function read(2) is usually implemented as a system call to the operating system kernel. ... This means that the internal read(2) from fgetc(3) wouldn't just read a single character, but rather it'll try to get more for the sake of efficiency.
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The sscanf() function reads the values from a char[] array and store each value into variables of matching data type by specifying the matching format specifier. sprintf() The sprintf() function reads the one or multiple values specified with their matching format specifiers and store these values in a char[] array.
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scanf reads from the standard input stream stdin. ... sscanf reads from the character string s. Each function reads characters, interprets them according to a format, and stores the results in its arguments.
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The ctype. h header file of the C Standard Library declares several functions that are useful for testing and mapping characters. All the functions accepts int as a parameter, whose value must be EOF or representable as an unsigned char.
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puts() writes the string s and a trailing newline to stdout. The function printf() writes output to stdout, under the control of a format string that specifies how subsequent arguments are converted for output. ... int printf(const char *format, ...);
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The C library function char *fgets(char *str, int n, FILE *stream) reads a line from the specified stream and stores it into the string pointed to by str. It stops when either (n-1) characters are read, the newline character is read, or the end-of-file is reached, whichever comes first.
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fopen() function is used to open a file to perform operations such as reading, writing etc. In a C program, we declare a file pointer and use fopen() as below. ... mode – refers to the operation that will be performed on the file. Example: r, w, a, r+, w+ and a+.
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fputc() function is a file handling function in C programming language which is used to write a character into a file. It writes a single character at a time in a file and moves the file pointer position to the next address/location to write the next character.
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['Function Header: <conio.h>', 'Return Value: This function returns the character read from the keyboard.', 'The getch() function is used to catch a character from the keyboard. ... ', '#include <conio.h>', '#include <stdio.h>', 'void main()', '{', 'int c;']
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['File name : while.l.', 'Program : %{ %} %% "while" {return key;} "(" {return ob;} ")" {return cb;} " " {return sp;} ";" {return sc;} ... ', 'File name : while.y.', 'Program : %{ #include<stdio.h> %} %token key. %token ob. %token op. %token vb. %token cb. ... ', 'Compilation Steps : lex while.l. yacc -d while.y. cc y.tab.c. ./a.out.', 'Output :']
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print just outputs. printf takes a formatting string like "%3f" and uses it to format the output. sprintf is the same as printf except it doesn't actually output anything. It returns a formatted string.
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fputc() is used to write a single character at a time to a given file. It writes the given character at the position denoted by the file pointer and then advances the file pointer. This function returns the character that is written in case of successful write operation else in case of error EOF is returned.
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The function feof() tests the end-of-file indicator for the stream pointed to by stream, returning nonzero if it is set. The end-of-file indicator can only be cleared by the function clearerr(). The function ferror() tests the error indicator for the stream pointed to by stream, returning nonzero if it is set.
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It stops when either (n-1) characters are read, the newline character is read, or the end-of-file is reached, whichever comes first. Same from man fgets : fgets() reads in at most one less than size characters from stream and stores them into the buffer pointed to by s. Reading stops after an EOF or a newline.
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The fgets() function in C reads up to n characters from the stream (file stream or standard input stream) to a string str . The fgets() function keeps on reading characters until: (n-1) characters have been read from the stream. a newline character is encountered.
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Functions ftell() and fseek() are important in a program performing file manipulations. Function ftell() returns the current position of the file pointer in a stream. The return value is 0 or a positive integer indicating the byte offset from the beginning of an open file.