sum of all digits from an integer number using c++

/* A Program that reads a six digit integer and prints the sum of its six digit using Arithmatic operators. */

#include<iostream>

using namespace std;

int print_sum_of_digit(int number)

{

    int a,i,sum=0,count=0;

    if(number!=0)

    {

        while(number>0)

        {

            i=number%10;

            number=number/10;

            sum+=i;

            count++;

        }

         cout<<"Number of Digit:"<<count<<endl;

         return sum;

    }

}

int main()

{

    int number,i;

    cout<<"Enter the digit of six integer:"<<endl;

    cin>>number;

    cout<<"The sum of the digit is:"<<print_sum_of_digit(number)<<endl;

    return 0;

}

Calculator using C++

/* Calculator that performing as calculator which allows all Arithmetic Operators with operands as input */

#include<iostream>

#include<stdlib.h>

#include<conio.h>

using namespace std;

int calculator(int a,char c,int b)

{

    int h,w,x,z;

    float y,m=0.0;

    z=(a+b);

    x=(a*b);

    w=(a-b);

    h=(a%b);

    y=(a/b);

    m=y;

    switch(c)

    {

    case '+':

        cout<<a<<"+"<<b<<"="<<z<<endl;

        break;

    case '-':

        cout<<a<<"-"<<b<<"="<<w<<endl;

        break;

    case '*':

        cout<<a<<"*"<<b<<"="<<x<<endl;

        break;

    case '/':

        cout<<a<<"/"<<b<<"="<<m<<endl;

        break;

    case '%':

        cout<<a<<"-"<<b<<"="<<x<<endl;

        break;

    default:

        cout<<"Error Input Program Terminated"<<endl;

        break;

    }

    getch();

    return 0;

}

int main()

{

    int a,b,x;

    char c,y;

    cout<<"Welcome To My Calculator:"<<endl;

    cout<<"Enter to calculate:"<<endl;

    start:

    cin>>a>>c>>b;

    calculator(a,c,b);

    cout<<"If you want to calculate more then press Y else N"<<endl;

    cin>>y;

    if(y=='y' || y=='Y')

    goto start;

    else if(y=='N' || y=='n')

    exit(0);

}