Question

3. Digits

Prompt the user, enter a number in the range [1000, 9999].

If input failure, complain and die

If outside the range, complain and die

Output the square of the number, and the sum of the squares of the digits, with explanatory text.

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An example run might go as:

# in [1000, 9999]:

1234

square is 1522756

sum of squares of digits is 30

Answer 1

As you have not mentioned any language, I am answering this question in C++

PROGRAM -

#include <iostream>

using namespace std;

int main()
{
int number, sumOfSquares=0, digit;
long squaredNumber=0;
cout<<"Enter a number in [1000, 9999] : ";
cin>>number; //prompt user
if(number>9999 || number<1000) { //check if input is correct
cout<<"Wrong input!";
exit(0); //if not die
}
squaredNumber = number * number; //compute square of the number
while(number) { //loop to compute sum of the square of the digits of the number
digit = number%10;
number=number/10;
sumOfSquares+=digit*digit;
}
//output result
cout<<"Square of the number is: "<<squaredNumber;
cout<<"\nSum of squares of digits of the number: "<<sumOfSquares;
  
}

OUTPUT