C++ beginner help

[rsoler1028]

For some reason the code is giving me an output for the discountpercentAwarded is 432120. Im trying to get the output to be according to my choice of books purchased.

 #include<iostream>

int main()
{
int amountBooks;
int storeCost = 39.95;
int discountpercentAwarded;

std::cout << "Enter The Number Of Books Purchased: ";
std::cin >> amountBooks;
std::cout << "Name: Advanced C++ Programming by Gaddis\n";

if(amountBooks == 0)
{
std::cout << "Discount Percent Awarded: " << discountpercentAwarded <<std::endl;
discountpercentAwarded = 0.00;
}
if(amountBooks <= 1)
{
std::cout << "Discount Percent Awarded:" << discountpercentAwarded <<std::endl;
discountpercentAwarded = 0.02;
}
if(amountBooks == 2)
{
std::cout << "Discount Percent Awarded: " << discountpercentAwarded <<std::endl;
discountpercentAwarded = 0.04;
}
if(amountBooks == 3)
{
std::cout << "Discount Percent Awarded: " << discountpercentAwarded <<std::endl;
discountpercentAwarded = 0.06;
}
if(amountBooks >= 4)
{
std::cout << "Discount Percent Awarded:"  << discountpercentAwarded <<std::endl;
discountpercentAwarded = 0.10;
}
else
{
if(amountBooks < 0)
std::cout << "Number of books cannot be negative!! \n\n";

std::cout << "Store Cost: " << storeCost <<std::endl;



}
} 

[JLBorges]

#include <iostream>
#include <iomanip>

int main()
{
    // use double to represent numbers with a fractional part
    /*int*/ const double storeCost = 39.95; 


    std::cout << "Name: Advanced C++ Programming by Gaddis\n"
              << "cost per book is " << storeCost << '\n'
              << "Enter The Number Of Books Purchased: ";
    int amountBooks;
    std::cin >> amountBooks;

    if(amountBooks < 0)
    {
         std::cout << "Number of books cannot be negative!! \n\n";
         return 1 ; // exit from program without doing anything else
    }

    /*int*/ double discountpercentAwarded  ;
    if(amountBooks == 0) discountpercentAwarded = 0.00 ;
    else if(amountBooks == 1) discountpercentAwarded = 0.02;
    else if(amountBooks == 2) discountpercentAwarded = 0.04;
    else if(amountBooks == 3) discountpercentAwarded = 0.06;
    else discountpercentAwarded = 0.10; // amountBooks >= 4

    std::cout << std::fixed << std::setprecision(2) // print two digits after the decimal point
              << "Discount Percent Awarded: " << discountpercentAwarded << '\n' ;

    const double gross_cost = amountBooks * storeCost ;
    std::cout << "gross cost: " << amountBooks << " books @ " << storeCost
              << " == " << gross_cost << '\n' ;

    const double discount_amount = gross_cost * discountpercentAwarded ;
    std::cout << "discount amount: " << discount_amount << '\n' ;

    const double net_cost = gross_cost - discount_amount ;
    std::cout << "net cost: " << net_cost << '\n' ;
}