Question

Using C++ language please not matlab

a. Write a function, called SumOfDigits that is able to calculate the summation of a five-digit number. This function receives one integer parameter 'a', then returns the sum of 5 digits of the number. [2.5 marks] b. Write a function, called Armstrong that prints all Armstrong numbers in the range of 0 and 500. An Armstrong number of three digits is an integer such that the sum of the cubes of its digits is equal to the number itself. For example, 371 is an Armstrong number since 33 + 73 + 13 = 371. [2.5 marks] a. Now after you created the two functions, you have to write a main function that can call the above functions according to user choice. Write a menu that allows the user to select from the following options [5 marks] 1. To use the SumOfDigits function you have to enter 1. 2. To use the Armstrong function you have to enter 2. 3. To Exit the program you have to enter 3. (use exit(0)] Once the user select one of the above choices you have to read the value entered by the user and then to call the respective function.

Answer 1

Here is the completed code for this problem. Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. If not, PLEASE let me know before you rate, I’ll help you fix whatever issues. Thanks

#include<iostream>

#include<cstdlib>

using namespace std;

//method to find the sum of digits of a positive number

//EDIT: now the implemetation works for number with 5 digits only.

int SumOfDigits(int n){

                //initializing sum to 0

                int sum=0;

                //looping for 5 times

                for(int i=0;i<5;i++){

                                //n%10 returns the last digit of n

                                int digit=n%10;

                                //adding to sum

                                sum+=digit;

                                //n/10 removes the last digit from n

                                n=n/10;

                }

                return sum;

}

//method to print the ArmStrong numbers under 500

void ArmStrong(){

                cout<<"Armstrong numbers between 0 and 500"<<endl;

                //since Armstrong numbers mentioned here are of 3 digits, we only need to

                //iterate through every 3 digit numbers upto 500

                for(int i=100;i<=500;i++){

                                //storing i in n

                                int n=i;

                                //extracting last digit

                                int d1=n%10;

                                //removing from n

                                n=n/10;

                                //extracting and removing current last digit

                                int d2=n%10;

                                n=n/10;

                                //extracting current last digit

                                int d3=n%10;

                                //checking if sum of cubes of all three digits is i

                                if((d1*d1*d1)+(d2*d2*d2)+(d3*d3*d3) == i){

                                                //Armstrong number

                                                cout<<i<<endl;

                                }

                }

}

int main(){

                int ch=0;

                //looping

                while(ch!=3){

                                //printing menu, reading choice

                                cout<<"1. To use the SumOfDigits function."<<endl;

                                cout<<"2. To use the ArmStrong function."<<endl;

                                cout<<"3. Exit"<<endl;

                                cin>>ch;

                                //handling choice

                                if(ch==1){

                                                //asking, reading a number, printing sum of digits

                                                int number;

                                                cout<<"Enter a number: ";

                                                cin>>number;

                                                //looping as long as number is not of 5 digits

                                                while(number<10000 || number>99999){

                                                                //asking and reading again

                                                                cout<<"Please enter a valid 5-digit positive number only: ";

                                                                cin>>number;

                                                }

                                                cout<<"Sum of digits: "<<SumOfDigits(number)<<endl;

                                }else if(ch==2){

                                                ArmStrong();

                                }else if(ch==3){

                                                exit(0);

                                }else{

                                                cout<<"Invalid choice!"<<endl;

                                }

                }

                return 0;

}

/*OUTPUT*/

1. To use the SumOfDigits function.

2. To use the ArmStrong function.

3. Exit

1

Enter a number: 12345

Sum of digits: 15

1. To use the SumOfDigits function.

2. To use the ArmStrong function.

3. Exit

1

Enter a number: 55600

Sum of digits: 16

1. To use the SumOfDigits function.

2. To use the ArmStrong function.

3. Exit

2

Armstrong numbers between 0 and 500

153

370

371

407

1. To use the SumOfDigits function.

2. To use the ArmStrong function.

3. Exit

3