#include using namespace std; /* * InflationRate - calculates the inflation rate given the old and new consumer price index * @param old_cpi: is the consumer price index that it was a year ago * @param new_cpi: is the consumer price index that it is currently * @returns the computed inflation rate or 0 if inputs are invalid. */ double InflationRate(float old_cpi, float new_cpi); void getCPIValues(float& old_cpi, float& new_cpi); int main() //C++ programs start by executing the function main { // #1: declare two float variables for the old consumer price index (cpi) and the new cpi float old_cpi, new_cpi, infrt, sum = 0, avg; char again; int crt = 0; const = MAX_RATES [20]; int numRates; do { // #2: Read in two float values for the cpi and store them in the variables getCPIValues(old_cpi, new_cpi); // #3: call the function InflationRate with the two cpis // #4: print the results infrt = InflationRate(old_cpi, new_cpi); if (infrt != 0) { sum += infrt; crt++; } cout << "Inflation rate is " << infrt << endl; for (int i=0; i < MAX_RATES; i++) // array takes the total inflation rate to calculate median cin >> numRates; // BONUS #1: Put the logic in #2-4 in a loop that asks the user to enter 'y' if there's more data cout << "Try again? (y or Y): "; cin >> again; } while((again == 'Y') || (again == 'y')); avg = sum/crt; cout << "Average rate is " << avg << endl; return 0; } void getCPIValues (float& old_cpi, float& new_cpi) { do { cout << "Enter the old and new consumer price indices: "; cin >> old_cpi >> new_cpi; if((old_cpi <= 0) || (new_cpi <= 0)) { cout << "Error: CPI values must be greater than 0."; } } while ((old_cpi <= 0) || (new_cpi <= 0)); } // double InflationRate(float old_cpi, float new_cpi) // precondition: both prices must be greater than 0.0 // postcondition: the inflation rate is returned or 0 for invalid inputs double InflationRate(float old_cpi, float new_cpi) { if ((old_cpi <= 0) || (new_cpi <= 0) || old_cpi == new_cpi) { return 0; } else // Implement InflationRate to calculate the percentage increase or decrease // Use (new_cpi - old_cpi) / old_cpi * 100 return ((new_cpi - old_cpi) / old_cpi * 100); } double swap_values(double MAX_RATES[], int numRates) { // swap array } double findMedian(double MAX_RATES[], int numRates) { // First we sort the array // sort(MAX_RATES, MAX_RATES+numRates); (do i need this here) // check for even case if (numRates % 2 != 0) return (double)MAX_RATES[numRates/2]; return (double)(MAX_RATES[(numRates-1)/2] + MAX_RATES[numRtaes/2])/2.0; }

Inflation Rate 3