scanf() - To Get Special Charecters and To Use it based on Constraints

As we know already C is one of the most important languages which maximize all other languages by giving its scalability.

People might have commonly known about scanf and printf. Apart from that there are some cases where special characters should be processed through C program.

In order to process the special characters, we should be aware of the methods that can get the special characters as input from the users.

In C, you can give any special character as input by utilizing the below functions: 

Functions:

1. In such situation like where you should get only the specified range of inputs from the user you can use the below.

   This can be done by the regular expressions such as below 

Ex,

scanf("\n%[abc]",name);

-> If you give like this you can only give a or b or c as input.

2. In such situations, you are not supposed to get some specified range of inputs from the users. In those cases use the regular expression as below

Ex,

scanf("\n%[^abc]",inp4);

-> If you give like this, you can't give a or b or c as input.

3. In some cases where you shoud read all the special characters util you find some particular text or particular special character in the input entered by the users. Use the below regular expression.

Ex,

scanf("\n%[^]]",inp3);

Example Program:

#include<stdio.h>

main()

{

char inp1[20],inp2[20],inp3[20],inp4[20],inp5[20],inp6[20];

printf("\n Enter Any String or Dotted string\n");

        scanf("%s",inp1);

        printf("\n Entered First String is:%s\n",inp1);

       printf("\n Enter any string that contains only a or b or c");

       scanf("\n%[abc]",inp2);

       printf("\n Entered  String is:%s",inp2);

      printf("\n Enter string to read up to ] symbol");

      scanf("\n%[^]]",inp3);

      printf("\n Enter string and this scanf will read input from user until it finds any ] %s",inp3);  

     printf("\n Enter string to read up to a or b or c");

    scanf("\n%[^abc]",inp4);

    printf("\n Entered First String is:%s",inp4);

}

OUTPUT:

Please share your special characteristics of scanf() fucntion!!!