Question

Write a C++ program that asks the user to enter a series of
single-digit numbers with nothing separating them. Read the input
as a C-string or a string object. The program should display the
sum of all the single-digit numbers in the string. For example, if
the user enters 2514, the program should display 12, which is the
sum of 2, 5, 1, and 4. The program should also display the highest
and lowest digits in the string.

It is recommended that you include a function such as int charToInt(char)

The charToInt function
accepts a char and returns the char's value as an integer digit. If
the char is not a digit, the function returns 0.

Remember to use proper formatting and code documentation.

Sample screen output (user input is in bold) :

Enter a series of digits with no spaces between them.
1 2 3 4 5
Incorrect input....?

Enter a series of digits with no spaces between them.
1234 4321
Incorrect input....?

Enter a series of digits with no spaces between them.
1234 srjc
Incorrect input....?

Enter a series of digits with no spaces between them.
srjc 1234
Incorrect input....?

Enter a series of digits with no spaces between them.
987654321
The sum of those digits is 45
The highest digit is 9
The lowest digit is 1

Process returned 0 (0x0)   execution time : 71.074 s
Press any key to continue.

Answer 1

Solution:

Look at the code and comments for better understanding............

Screenshot of the code:

Output:

Code to copy:

#include<iostream>
using namespace std;
//a function that checks if the input is valid or not
bool check(string input)
{
        for(int i=0;input[i]!='\0';i++)
        {
                //if the input contains spaces or characters other than digits we return false
                if(input[i]==' ' || input[i]<'0' || input[i]>'9')
                {
                        return false;
                }
        }
        return true;
}
//converting a char to digit
int charToInt(char ch)
{
        return ch-'0';
}
int main()
{
        //loop untill a valid input is given
        while(1)
        {
                string input;
                cout<<"Enter a series of digits with no spaces between them."<<endl;
                getline(cin,input);
                //check the input
                if(check(input)==false)
                {
                        cout<<"Incorrect input....?"<<endl<<endl;
                        continue;
                }
                int sum=0,low=9,high=0;
                for(int i=0;input[i]!='\0';i++)
                {
                        int digit = charToInt(input[i]);
                        //finding sum , lowest and highest digit 
                        sum += digit;
                        if(digit < low)
                                low = digit;
                        if(digit > high)
                                high = digit;
                }
                //printing the digits
                cout<<"The sum of those digits is "<< sum << endl;
                cout<<"The highest digit is "<< high << endl;
                cout<<"The lowest digit is "<< low << endl;
                break;
        }
}

I hope this would help................................:-))