While loop ,

 #include<iostream>

using namespace std;

int main()

{

int a,b,c;

cout<<"Enter the nomber that started the series"<<endl;

cin>>a;

cout<<"Enter the nomber that end the series"<<endl;

cin>>b;

cout<<"Enter the difference in two numbers in the series"<<endl;

cin>>c;

do

{

cout<<"Value of a : "<<ends<<a<<endl;

a=a+c;

}

while(a<=b);

   return 0;

}