2015年8月5日 · Since scanf() needs to write to its arguments, it expects those arguments to typed as pointers. The "%d" conversion specifier expects the corresponding argument to be a pointer to int ( int * ), the "%u" conversion specifier expects a pointer to unsigned int ( unsigned * ), "%s" expects a pointer to char ( char * ), "%f" expects a pointer to ...

2015年6月1日 · @supercat So first you ask for reasons. I point you to an elaborate paper by the standard conmittee on the Annex K "safe" functions (which by definition includes scanf_s even if you don't find it in a full-text search), and you start arguing fine print as if those guys didn't know what they are talking about.

2014年1月18日 · But the problem is the program will trap at the line of scanf() function forever to wait for an input character, if no character is entered. So I'm wondering how to skip the line of scanf() after a certain time, I mean for example, if no input after 1 second, the program can continue, so as to fulfill the second thing listed above.

In case 1, the better solution is, do not mix calls to scanf with other input functions. Either do all your input with scanf, or do all your input with getchar and/or fgets. To do all your input with scanf, you can replace calls to getchar with scanf("%c") — but see point 2.

2014年1月3日 · scanf("%d",&n); Suppose, you entered 10 then pressed 'Enter', now scanf() takes 10 and leaves a newline behind in the buffer. It is making problem. By getchar() you are eating up that new line each time after taking a input with scanf. Yes there are other solutions too with scanf() tricks but it seems simpler to me. So I shared it.

2019年9月19日 · I fully agree with the advice to disable MSVC's advice to use their pseudo-Annex K functions; however, the scanf family are unsafe, for several reasons, most importantly that %s is just as dangerous as gets, and that numeric conversion has undefined behavior on numeric input overflow (yes, that means the C library is allowed to crash just because someone typed too …

2013年5月22日 · I have to create and call a function from main. Then I have to call scanf to read two integers and print out the bigger one. Then I have to do another scanf, but this time with doubles instead of

From scanf: On success, the function returns the number of items successfully read. This count can match the expected number of readings or fewer, even zero, if a matching failure happens. In the case of an input failure before any data could be successfully read, EOF is returned.

2015年10月10日 · scanf("%d", &int); This works if I pass in a int32_t but I assume it is only because an int on my system is 32 bits and it does not specifically give me a 32 bit number instead it just gives me an int .

2013年3月5日 · From man scanf: Return Value These functions return the number of input items successfully matched and assigned, which can be fewer than provided for, or even zero in the event of an early matching failure.