c++ won't output the correct decimal...

[John McCrary]

#include <iostream>
#include <cmath>

using namespace std;

void tax(float r, double x, double y, float z)
{
		
	cout<<"Please input the cost of an item: ";
	cin>>x;
	cout<<"\n";
	y='.08';
	r='x*y';
	cout<<"Tax on most items today is 8% of the total cost."<<endl;
	cout<<x*y<<" is how much you will be taxed on that purchase."<<endl;
	cout<<" "<<endl;
	cout<<"The total cost after tax is, "<<floor((r+x)+0.5)<<endl;
}


int main()
{
	float r;
	double x;
	double y;
	float z;
	
	
	cout<<"======================================================\n";
	cout<<"|        WELCOME TO MY TEXT BASED TAX CALCULATOR     |"<<endl;
	cout<<"|                                                    |"<<endl;
	cout<<"| This calculator was written in c++ by John McCrary |"<<endl;
	cout<<"======================================================\n";
	
	tax(r, x, y, z);
	
	return 0;
}

the output is:

1 2 3 4 5 6 7 8 9 10 11 12 13 14

====================================================== | WELCOME TO MY TEXT BASED TAX CALCULATOR | | | | This calculator was written in c++ by John McCrary | ====================================================== Please input the cost of an item: 10 Tax on most items today is 8% of the total cost. 3.027e+07 is how much you will be taxed on that purchase. The total cost after tax is, 7.8752e+06

(program exited with code: 0) Press return to continue

and obviously (.08*10) + 10 doesn't equal 7.8752

[Athar]

You should stop putting single quotes around everything. A character in single quotes is a character literal.