C or C++ Program to Show Sum of a Digit

This article describes about the program Sum of a digit in C/C++. Let us discuss about the digit sum or sub of a digit system.

Digit sum or Sum of a Digit
In mathematics the digit sum of a given integer is the sum of all its digits. That means the digit sum of 65001 is calculated as 6+5+0+0+1 = 12.

Program to Show Sum of a Digit

#include
#include
int main()
{
    clrscr();
    long a,k,n,p;
    cout<<"This program will show Sum of a given digit."<<endl<<endl;
    cout<<"What is the digit ?. Give  a integer number or digit. "<<endl;     cin>>a;
    n=a;
    p=0;
    while(a!=0)
    {
        k=a%10;
        p=p+k;
        a=a/10;
    }
    cout<<endl<<"Sum of given digit "<<n<<" is :"<<p;
    getch();
}