Adding 3 Number

#include<iostream.h>
#include<conio.h>
main()

{
int a,b,c;

cout<<"Enter A Number(3 digits) : ";
cin>>a;

c=a % 10; // 123 % 10= 3 (c) "get reminder"
b=a / 10; // 123 / 10= 12 (b) "as whole number"
a=b % 10; //2 12 % 10= 2 (a) "get reminder"
b=b / 10; //1 12 / 10= 1 (b) "as whole numder"


c=c+b+a; // (c)= 3(c) + 1(b) + 2(a)

cout<<c;

getch();
}