在Linux下，使用
gets(cmd)
函数报错：warning: the 'gets' function is dangerous and should not be used.
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解决办法：采用
fgets(cmd,100,stdin);//100为size
问题解决！
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fgets从stdin中读字符，直至读到换行符或文件结束，但一次最多读size个字符。读出的字符连同换行符存入缓冲区cmd中。返回指向cmd的指针。
gets把从stdin中输入的一行信息存入cmd中，然后将换行符置换成串结尾符NULL。用户要保证缓冲区的长度大于或等于最大的行长。
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gets的详细解释：
char * gets ( char * str );//Get string from stdin
Reads characters from stdin and stores them as a string into str??until a newline character ('\n') or the End-of-File is reached.
The ending newline character ('\n') is not included in the string.
A null character ('\0') is automatically appended after the last character copied to str to signal the end of the C string.
Notice that gets does not behave exactly as fgets does with stdin as argument: First, the ending newline character is not included with gets while with fgets it is. And second,?gets does not let you specify a limit on how many characters are to be read, so you must be careful with the size of the array pointed by str to avoid buffer overflows.
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说明：红色部分很好地解释了“the 'gets' function is dangerous and should not be used”这个warning的原因。
参考链接：http://www.cplusplus.com/reference/clibrary/cstdio/gets/
转载于:https://www.cnblogs.com/yitianxi/p/5046798.html
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