在Linux下，使用
gets(cmd)
函數(shù)報錯：warning: the 'gets' function is dangerous and should not beused.
解決辦法：采用
fgets(cmd,100,stdin);//100為size
問題解決！
fgets從stdin中讀字符，直至讀到換行符或文件結(jié)束，但一次最多讀size個字符。讀出的字符連同換行符存入緩沖區(qū)cmd中。返回指向cmd的指針。
gets把從stdin中輸入的一行信息存入cmd中，然后將換行符置換成串結(jié)尾符NULL。用戶要保證緩沖區(qū)的長度大于或等于最大的行長。
gets的詳細(xì)解釋：
char * gets ( char * str );//Get string fromstdin
Reads characters from stdin and stores them as a string intostr
The ending newline character ('\n') is not included in thestring.
A null character ('\0') is automatically appended after the lastcharacter copied to str to signal the end of the C string.
Notice that gets does notbehave exactly as fgets does with stdin as argument: First,the ending newline character is not included with gets while withfgets it is. And second, gets does not let you specify a limit on howmany characters are to be read, so you must be careful with thesize of the array pointed by str to avoid bufferoverflows.
說明：紅色部分很好地解釋了“the'gets' function is dangerous and should not beused”這個warning的原因。
參考鏈接：http://www.cplusplus.com/reference/clibrary/cstdio/gets/
