Help needed with yearly interest calculation.

[wajna]

So I have a homework to do where I have to make a loop. The goal is to make the computer calculate how many years it will take me to reach my goal if I put lets say 300 dollars every year and how much I will have after having interest calculated. This code I have below is not really complete, just an exemple.
Help would be appreciated.

#include <iostream>
using namespace std;

int; float main()

{
int nr1;
int nr2;
float nr3;
int nr4;
float nr5;

cout << "How much you want to save every year: \n";
cin >> nr1;

cout << "What is your goal: \n";
cin >> nr2;

cout << "How much interest in percent: \n";
cin >> nr3;


while (true)
{

cout << "Your goal will be reached after: " << nr4 << endl;
cout << "Your salery will then be: " << nr5 << endl;
break;
}

[jonnin]

before coding can you say how to do this on paper? How would you solve this?

[salem c]

cout << "How much you want to save every year: \n";
cin >> nr1;

cout << "What is your goal: \n";
cin >> nr2;

cout << "How much interest in percent: \n";
cin >> nr3;

Perhaps instead, something far more readable

cout << "How much you want to save every year: \n";
cin >> annualSavings;

cout << "What is your goal: \n";
cin >> desiredTarget;

cout << "How much interest in percent: \n";
cin >> interestRate;

At least then, you might be able to construct a readable loop, like

while ( currentTotal < desiredTarget ) {
    numberOfYears++;
    currentTotal += annualSavings;
    // add interest
}