Challange 2: Determine the User Input .

Question

Get an Input from user and check whether the entered Input is Integer, String, Digit, Character, Alpha Numeric or Special Character ? If input is none of the above then display " Not a Valid Input " .

An input is :

a Digit ( not char )

a Character ( not a digit )

a String

an Integer Number (can be any +'ve of -'ve)

an Alpha Numeric input

or can be a Special Character input.

Quite a Simple one..... just to revice the basics .

Answer 1

https://code.sololearn.com/cWz1HpV1N6bR/?ref=app

Answer 2

@R- Ry
I think there is an error in your code.
See the std::getline() call. You used (input,128), where the new getline accepts a stream and a string object.
(128, isn't a stream object, but a size).
I think the call should be :
std::cin.getline(input,128);

Answer 3

https://code.sololearn.com/cnxi7DID8NnK/#cpp
Here's My Submission for the challenge. Please review.

Answer 4

@R- Ry, I think he means that an input is
a digit
a char (not a digit)
an integer (not a digit)
(you can add a floating number (neither integer nor digit))
a string (neither of the previous ones)

Answer 5

There's a small problem with this. A string can be any amount of characters or digits so basocally any type can represent a string if converted. A digit is also a character. But to a limited extent, we can check the input:

#include <cstdio>
#include <cstring>
#include <iostream>

char input[128];
bool is_string = false, is_int = false, is_char = false;
char a[128];
int b;

int main(){
std::getline(input, 128);

if(sscanf(input, "%s", a) == 1){
is_sting = true;
}
if(sscanf(input, "%d", &b) == 1){;
is_int = true;
if(strlen(input) == 1){
is_char = true;
}
return 0;
}

The function sscanf is like extracting from an input stream but it uses a character string instead. The value it returns is the number of values extracted from the string.

p.s. you could also check if it's a digit or alpha-numeric but just to keep things shorter, I left those out.