Question

Write a program in C++ that implements a function

// Precondition: num >= 0
int rotateUp(int num);

which produces a new integer with each digit replaced with (digit+1), and 9 replaced with 0, because we don’t have digit 10:

rotateUp(5) == 6
rotateUp(17) == 28
rotateUp(126) == 237
rotateUp(5091) == 6102
rotateUp(9911) == 22   // technically, more like 0022

The program should have a main function that tests the function.

Example Output:

Enter a number: 901

12

Answer 1

#include <iostream>
using namespace std;

//below function will extract each digit from number and then add 1 to it
int rotateUp(int num){
    int base = 1;
    int digit;
    int number = 0;
    while(num){
        digit = num % 10;
        num /= 10;
        digit = (digit + 1) % 10;
        number += digit * base;
        base *= 10;
    }
    return number;
}

int main(){
    int number;
    cout<<"Please enter a number :";
    cin>>number;
    cout<<"Rotated number = "<<rotateUp(number)<<endl;
    return 0;
}