user-0 提问: 请问这个代码有错吗，不管这个代码的目的，输入数字5，却没有结果输出

回复:
user: user-1
content: Format Specification Fields: scanf and wscanf Functions A format specification has the following form:  % [width] [{h | l | I64 | L}]type  The format argument specifies the interpretation of the input and can contain one or more of the following:   White-space characters: blank (' '); tab ('\t'); or newline ('\n'). A white-space character causes scanf to read, but not store, all consecutive white-space characters in the input up to the next non–white-space character. One white-space character in the format matches any number (including 0) and combination of white-space characters in the input.   Non–white-space characters, except for the percent sign (%). A non–white-space character causes scanf to read, but not store, a matching non–white-space character. If the next character in stdin does not match, scanf terminates.   Format specifications, introduced by the percent sign (%). A format specification causes scanf to read and convert characters in the input into values of a specified type. The value is assigned to an argument in the argument list.  The format is read from left to right. Characters outside format specifications are expected to match the sequence of characters in stdin; the matching characters in stdin are scanned but not stored. If a character in stdin conflicts with the format specification, scanf terminates, and the character is left in stdin as if it had not been read.  When the first format specification is encountered, the value of the first input field is converted according to this specification and stored in the location that is specified by the first argument. The second format specification causes the second input field to be converted and stored in the second argument, and so on through the end of the format string.  An input field is defined as all characters up to the first white-space character (space, tab, or newline), or up to the first character that cannot be converted according to the format specification, or until the field width (if specified) is reached. If there are too many arguments for the given specifications, the extra arguments are evaluated but ignored. The results are unpredictable if there are not enough arguments for the format specification.  Each field of the format specification is a single character or a number signifying a particular format option. The type character, which appears after the last optional format field, determines whether the input field is interpreted as a character, a string, or a number.   The simplest format specification contains only the percent sign and a type character (for example, %s). If a percent sign (%) is followed by a character that has no meaning as a format-control character, that character and the following characters (up to the next percent sign) are treated as an ordinary sequence of characters, that is, a sequence of characters that must match the input. For example, to specify that a percent-sign character is to be input, use %%.  An asterisk (*) following the percent sign suppresses assignment of the next input field, which is interpreted as a field of the specified type. The field is scanned but not stored.

user: user-2
content: 引用 2 楼 MENGLONG___ 的回复:为什么把\n去掉就会结束呢？ 这是scanf函数的设计，scanf是行缓冲，当遇到回车时，才将输入缓冲里的数据刷到内存，因此遇到回车才行，如果在scanf格式化输入里还有回车，那么输入的回车不能将数据刷到内存，而是匹配回车符

user: user-3
content: 楼主是要算阶乘吗？应当改成这样的代码：  #include <stdio.h>  int f(int n);  void main() { 	int n, x; 	scanf("%d", &n); 	x = f(n); 	printf("%d", x); } int f(int n) { 	int i, z; 	int res = 0; 	if (n > 1) { 		res = n*f(n - 1); 	} else { 		return 1; 	} 	return res; }

user: user-4
content: scanf("%d\n",&n); 改成 scanf("%d",&n);  http://blog.csdn.net/weiweicsdn1/article/details/52185453

user: user-5
content: 有那个\n的话，按正常的方式输入你应该是没有结果才对，就是运行不到x=f(n)这里。 不过输入一个数按下回车之后，再按一下回车就会向下运行了。

user: user-0
content: 为什么把\n去掉就会结束呢？

user: user-6
content: 递归要有退出条件，scanf格式输入里面\n去掉

user: user-7
content: 你这样递归   最后的答案也不会对     这个程序执行到循环时  就一直循环  梯归   ，处理器  运算快的话   能算出来   不过是随机值  因为返回Z的值 已经超过int类型取值范围了  也就是数据溢出，产生错误 而且这个程序，输入值为2时  就会崩溃