fgets, fputs, ferror, feof, stdin, stdout, EOF, fopen, fclose, fgetc, fputc, getchar, putchar

 注意区分
gets, fgets, fgetc, getc, getchar
puts, fputs, fputc, putc, putchar
 
fgets
 

function
<cstdio>
char * fgets ( char * str, int num, FILE * stream );
Get string from stream
Reads characters from stream and stores them as a C string into str until (num-1) characters have been read or either a newline or a the End-of-File is reached, whichever comes first.
A newline character makes fgets stop reading, but it is considered a valid character and therefore it is included in the string copied to str.
A null character is automatically appended in str after the characters read to signal the end of the C string.
 

fputs

function
<cstdio>
int fputs ( const char * str, FILE * stream );
Write string to stream
Writes the string pointed by str to the stream.
The function begins copying from the address specified (str) until it reaches the terminating null character ('\0'). This final null-character is not copied to the stream.

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