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Scansets in C
Let us see, what is the scanset in C. The scanset is basically a specifier supported by scanf family functions. It is represented by %[]. Inside scanset we can specify only one character or a set of characters (Case Sensitive). When the scanset is processed, the scanf() can process only those characters which are mentioned in the scanset.
Example
#include<stdio.h>
int main() {
char str[50];
printf("Enter something: ");
scanf("%[A-Z]s", str);
printf("Given String: %s", str);
}Output
Enter something: HElloWorld Given String: HE
It ignores the characters which are written in lowercase letters. The ‘W’ is also ignored because there are some lower case letters before it.
Now, if the scanset has ‘^’ in its first position, the specifier will stop reading after first occurrence of that character.
Example
#include<stdio.h>
int main() {
char str[50];
printf("Enter something: ");
scanf("%[^r]s", str);
printf("Given String: %s", str);
}Output
Enter something: HelloWorld Given String: HelloWo
Here the scanf() ignores the characters after getting the letter ‘r’. Using this feature, we can solve the problem that a scanf does not take strings with spaces. If we put %[^
], then it will take all of the characters until it gets a new line character.
Example
#include<stdio.h>
int main() {
char str[50];
printf("Enter something: ");
scanf("%[^
]s", str);
printf("Given String: %s", str);
}Output
Enter something: Hello World. This line has some spaces. Given String: Hello World. This line has some spaces.
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