I need help on this C++ problem?

Question

so the question asks to write a program that inputs prices for three book and outputs the highest price. basically i have to write a program to compare the prices. my prof gave us a skeleton of the program and i basically had to fill in he function definition for the function declaration. however, my program doesnt work. i know something is wrong but i don't know what.
thanks!


#include
using namespace std;

double comp (double bk1_par, double bk2_par, double bk3_par);

int main()
{
double bk1, bk2, bk3, max;

cout << "Please input the price for the first book:";
cin >> bk1;
cout << "Please input the price for the second book:";
cin >> bk2;
cout << "Please input the price for the third book:";
cin >> bk3;

max = comp(bk1, bk2, bk3);

cout << "The highest price is " << max << endl;

return 0;
}

double comp( double bk1_par, double bk2_par, double bk3_par)
{
double bk1_par, bk2_par, bk3_par;

if ((bk1_par > bk2_par) && (bk1_par > bk3_par))
return bk1_par;
else if ((bk2_par > bk1_par) && (bk2_par > bk3_par))
return bk2_par;
else if ((bk3_par > bk1_par) && (bk3_par > bk2_par))
return bk3_par;
}

Answer 1

It's been a while since I've done C++, but I believe the problem lies here:

double comp( double bk1_par, double bk2_par, double bk3_par)

{

double bk1_par, bk2_par, bk3_par;



You're redeclaring the arguments of the function inside the function, effectively wiping their memory. Inside a function the arguments are already defined (they're really just dummy names anyway), so just delete that line of declarations and the program should world perfectly.





Edit: Tested it... yep it works if that line disappears.

Answer 2

try removing the line in your function definition :



double bk1_par, bk2_par, bk3_par;



the second declaration might be clearing the values passed to your function

Answer 3

Better place for your question is :::



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