Compound interest in awk

compound_interest.awk

#!/bin/awk
# Input: "Initial_cash interest_rate number_of_years yearly_deposit"
{
    initial_amount = $1
    interest_rate = $2
    number_of_years = $3
    yearly_deposit = $4

    total = initial_amount
    current_year = 1

    while (current_year <= number_of_years) {
        total = total * (1 + interest_rate) + yearly_deposit
        current_year += 1
    }
    printf("At a rate of %.2f, you will have %.2f $ after %d years for an initial deposit of %d $ if you add %d $ per year\n",
           interest_rate, total, number_of_years, initial_amount, yearly_deposit)
}