Как изменить эту программу на C

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#include <iostream>
#include <cmath>
#include <fstream>
#include <stdlib.h>
using namespace std;

void getInput(double price[],int quantity[], int totalItem)
{
   for (int i = 0; i < totalItem; ++i)
   {
       cout << "Price of item " << (i+1) << " = ? ";
       cin >> price[i];
       cout << "Quantity of item " << (i+1) << " = ? ";
       cin >> quantity[i];
   }
}

void computeTotal(double price[],int quantity[],double total[], int totalItem)
{
   for (int i = 0; i < totalItem; ++i)
   {
       total[i] = price[i]*quantity[i];
   }
}

void displayResults(double price[],int quantity[],double total[], int totalItem)
{
   cout << "\nThe sales summary is:\n";
   cout << "Price($) Quantity Total($)\n";
   cout << "-------------------------\n";
   for (int i = 0; i < totalItem; ++i)
   {
       cout << price[i] << "\t " << quantity[i] << "\t " << total[i] << endl;
   }
}


int main ()
{
   int totalItem = 8;

   double price[8];
   int quantity[8];
   double total[8];

   cout << "Please enter the price and quantity of 8 items\n";
   getInput(price,quantity,totalItem);

   computeTotal(price,quantity,total, totalItem);

   displayResults(price,quantity,total, totalItem);
   return 0;
}

Что я уже пробовал:

Я хочу изменить его на программирование на языке Си

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