Income calculator , C++ (gcc)

Income calculator

#include <bits/stdc++.h>
using namespace std;
/**
 * To run this program, please enter below data.
 * 1) Enter Age: 
 * 2) Enter yeraly income:
 * 3) Total expense yeraly:
 * 4) Already invested amount by customer (for example how much customer has invested in LIC/FD/Other sector already)
 * 
*/

int main() {
    long age, yearlyIncome, yearlyExpense, alreadyInvestedAmount, factor;
	cin>>age>>yearlyIncome>>yearlyExpense>>alreadyInvestedAmount;
	if(age <=0 || age > 60) {
	    cout<<"Entered age is negative or greater than 60, please enter age between 1 to 60";
	    return 0;
	}
	if(age <= 30) {
	    factor = 22;
	} else if(age > 30 && age <=40 ) {
	    factor = 18;
	} else {
	    factor = 10;
	}
	
	long ans = yearlyIncome*factor - yearlyExpense - alreadyInvestedAmount;
	cout<<"Customer age: "<<age<<endl;
	cout<<"Customer yearly Income: "<<yearlyIncome<<endl;
	cout<<"Customer yearly Expense: "<<yearlyExpense<<endl;
	cout<<"Customer already Invested Amount: "<<alreadyInvestedAmount<<endl;
	cout<<"Amount customer should Invest: "<<ans<<endl;
	return 0;
}


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