Question

You need to be able to read an integer, which is a string of decimal digits, possibly beginning with a ‘-’ sign. Ignoring the possible minus sign, the classic algorithm for converting a string of digits into a number is based on initializing an accumulator value to 0. Then for each digit of the input, multiply the accumulator by ten and add in the value (0-9) of the digit.

Answer 1

C++ code:-

#include <bits/stdc++.h>
using namespace std;

int main()
{
    char choice;
    do
    {
    cout << "\n Enter an integer : ";
    string str;

    cin>>str;
    int i,n;
    double acc = 0;

    if(str[0] == '-')
    {
        for(i = 1 ; i < str.length() ; i++ )
            acc = acc*10 + (str[i]-'0');
    }
    else
    {
        for(i = 0 ; i < str.length() ; i++ )
            acc = acc*10 + (str[i]-'0');
    }

    cout<<"\n Converted Integer : "<<acc<<endl;

    cout<<"\n Press y to continue . n To exit : ";
    cin>>choice;

    }while(choice != 'n');

    return 0;
}

--------------------------------------------------------------------------------------------------------------------------------

Output :-