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# std::fgets

From cppreference.com
< cpp‎ | io‎ | c

Defined in header `<cstdio>` |  |
char* fgets( char* str, int count, std::FILE* stream ); |  |

Reads at most count - 1 characters from the given file stream and stores them in the character array pointed to by `str`. Parsing stops if end-of-file occurs or a newline character is found, in which case `str` will contain that newline character. If no errors occur, writes a null character at the position immediately after the last character written to `str`.

### [edit] Parameters

str | - | pointer to an element of a char array
count | - | maximum number of characters to write (typically the length of `str`)
stream | - | file stream to read the data from

### [edit] Return value

`str` on success, null pointer on failure.

If the failure has been caused by end-of-file condition, additionally sets the eof indicator (see std::feof()) on `stream`. The contents of the array pointed to by `str` are not altered in this case.

If the failure has been caused by some other error, sets the error indicator (see std::ferror()) on `stream`. The contents of the array pointed to by `str` are indeterminate (it may not even be null-terminated).

### [edit] Example

Run this code

    #include <iostream>
    #include <cstdio>
    #include <cstdlib>

    int main()
    {
        std::FILE* tmpf = std::tmpfile();
        std::fputs("Alan Turing\n", tmpf);
        std::fputs("John von Neumann\n", tmpf);
        std::fputs("Alonzo Church\n", tmpf);

        std::rewind(tmpf);
        char buf[8];
        while (std::fgets(buf, sizeof buf, tmpf) != NULL) {
            std::cout << '"' << buf << '"' << '\n';
        }
    }

Output:

    "Alan Tu"
    "ring
    "
    "John vo"
    "n Neuma"
    "nn
    "
    "Alonzo "
    "Church
    "

### [edit] See also

scanf fscanf sscanf | reads formatted input from stdin, a file stream or a buffer (function) [edit]
gets (until C++14) | reads a character string from stdin (function) [edit]
fputs | writes a character string to a file stream (function) [edit]
C documentation for fgets

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