if someone could take a look at this problem and give me some advice

At the beginning of every year, khalid receives a raise on his previous years salary. He wants a program that calculates and displays the amount of his annual raises for the next 3 years, using percent rates 3% 4% 5% and 6%. the program should end when khalid enters a sentinel value for the salary. this is what I got so far and I stuck from here I don't understand thanks in advance.

    enter code here#include <iostream>
#include <iomanip>
using namespace std;

int main()
{
double years;
double rates;
double prevyear;
double annualraise;
double salary;

cout << fixed << setprecision(0);

 cout << "prev year";
 cin >> prevyear;

if (years < 1 || years > 3)
    cout << "prevyear" << endl;
else  
{
 cout << " salary as a whole number";
 cin >>  salary; 
 cout << endl;

} }