char s1[100];
char s2[100];
gets(s1);
fgets(s2,sizeof(s2),stdin);
printf("%d,%d\n",strlen(s1),strlen(s2));
运行后，我输入“abcd”两次，
我得到的结果是：4,5这是为什么？
来自gets / fgets手册页：
The fgets() function reads at most one less than the number of characters
specified by n from the given stream and stores them in the string s.
Reading stops when a newline character is found, at end-of-file or error.
The newline, if any, is retained. If any characters are read and there
is no error, a `\0' character is appended to end the string.
The gets() function is equivalent to fgets() with an infinite n and a
stream of stdin, except that the newline character (if any) is not stored
in the string. It is the caller's responsibility to ensure that the
input line, if any, is sufficiently short to fit in the string.
fgets保留换行符，即第 5 个字符，但是gets没有。
另外，养成使用的习惯fgets总是，因为在使用时不可能防止缓冲区溢出gets.
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