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If the input stream were greater than 20 characters, a subsequent call to input would begin where this call left off Input for a field may terminate before the maximum field length is reached if a white space is encountered In this case, scanf( ) moves on to the next field Although spaces, tabs, and newlines are used as field separators, when reading a single character, these are read like any other character For example, given an input stream of x y,
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scanf("%c%c%c", &a, &b, &c);
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will return with the character x in a, a space in b, and the character y in c Beware: Besides format commands, other characters in the control string including spaces, tabs, and newlines will be used to match and discard characters from the input stream Any character that matches is discarded For example, given the input stream 10t20,
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scanf("%dt%d", &x, &y);
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will store 10 in x and 20 in y The t is discarded because of the t in the control string Another feature of scanf( ) is called a scanset A scanset defines a set of characters that will be read by scanf( ) and assigned to the corresponding character array A scanset is defined by putting the characters you want to scan for inside square brackets The beginning square bracket must be prefixed by a percent sign For example, this scanset tells scanf( ) to read only the characters A, B, and C:
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When a scanset is used, scanf( ) continues to read characters and put them into the corresponding character array until a character that is not in the scanset is encountered The corresponding variable must be a pointer to a character array Upon return from scanf( ), the array will contain a nullterminated string made up of the characters read You can specify an inverted set if the first character in the set is a ^ When the ^ is present, it instructs scanf( ) to accept any character that is not defined by the scanset For many implementations, you can specify a range using a hyphen For example, this tells scanf( ) to accept the characters A through Z:
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One important point to remember is that the scanset is case sensitive Therefore, if you want to scan for both upper- and lowercase letters, they must be specified individually The scanf( ) function returns a number equal to the number of fields that were successfully assigned values This number will not include fields that were read but not
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Page 344
assigned because the * modifier was used to suppress the assignment EOF is returned if an error occurs before the first field is assigned Format Modifiers for Scanf( ) Added by C99 C99 adds several format modifiers to scanf( ): hh, ll, j, z, and t The hh modifier can be applied to d, i, o, u, x, or n It specifies that the corresponding argument is a pointer to a signed or unsigned char value The ll modifier also can be applied to d, i, o, u, x, or n It specifies that the corresponding argument is a pointer to a signed or unsigned long long int value The j format modifier, which applies to d, i, o, u, x, or n, specifies that the matching argument is a pointer to an object of type intmax_t or uintmax_t These types are declared in <stdinth> and specify greatest-width integers The z format modifier, which applies to d, i, o, u, x, or n, specifies that the matching argument is a pointer to an object of type size_t This type is declared in <stddefh> and specifies the result of sizeof The t format modifier, which applies to d, i, o, u, x, or n, specifies that the matching argument is a pointer to an object of type ptrdiff_t This type is declared in <stddefh> and specifies the difference between two pointers Example The operation of these scanf( ) statements is explained in their comments:
#include <stdioh> int main(void) { char str[80], str2[80]; int i; /* read a string and an integer */ scanf(''%s%d", str, &i); /* read up to 79 chars into str */ scanf("%79s", str); /* skip the integer between the two strings */ scanf("%s%*d%s", str, str2); return 0; }
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