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scanf("%s",&a);这个写法对吗?
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scanf reads particular types of data into addresses which are passed as second, third, fourth and so on arguments. int var; scanf("%d",&var); Here var is value and &var is address. The above statement says: read %d (integer) type of data into &var address. char s[20]; scanf("%s",s); Here s is address not the value because s is a character array ...
pa = &a; // assign address of a to pa scanf("%d", pa); // scanf() will write to a through pa ... } Note also that when passing an array to a function (such as when using the "%s" conversion specifier to read a string), you don't need to use the & operator; the array expression will implicitly be converted to a pointer type:
int scanf( const char * format, .... Here, int is the return type.; format is a string that contains the format specifiers(s). "…" indicates that the function accepts a variable number of arguments. If you're interested in learning more about input handling and integrating it into complex data structures, the C Programming Course Online with Data Structures covers practical ...
Definition and Usage. The scanf() function reads user input and writes it into memory locations specified by the arguments.. The scanf() function is defined in the header file.. The format parameter is a string that describes the format of the data that is expected. If the user input does not match the format then the function stops reading at the point where the first mismatch occurs.
Here's a closer look at how scanf() can be used to read different types of data: Reading Integers: To read an integer using scanf(), you need to use the %d format specifier. For example:
%s for reading a string and %Ns, where N is a positive integer, for reading up to N characters Use an ampersand & before the variable to represent the "address" of the variable (the location where the value should be stored). When reading a number, scanf skips initial whitespace (spaces, tabs, newline characters).
N/A: N/A: N/A: N/A: N/A: s: Matches a sequence of non-whitespace characters (a string).. If width specifier is used, matches up to width or until the first whitespace character, whichever appears first. Always stores a null character in addition to the characters matched (so the argument array must have room for at least width+1 characters) [set]Matches a non-empty sequence of character from ...
Here, we have used %d format specifier inside the scanf() function to take int input from the user. When the user enters an integer, it is stored in the testInteger variable. Notice, that we have used &testInteger inside scanf(). It is because &testInteger gets the address of testInteger, and the value entered by the user is stored in that address.
Using scanf is tricker than printf. This is because of promotion, so that any type smaller than an int is promoted to an int when passed to printf, and floats are promoted to double. This means there is a single code for most integers and one for most floating point types. There is no such promotion with scanf arguments, which are actually ...
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