There is something wrong with this program. The code is ok, the program runs, but it stops after asking the user how much their income is. Where am I going wrong? (Sorry, it's really long, but I can't figure out where the problem is)

``````#include <iostream>
#include <string>
#include <cctype>
#include <iomanip>

using namespace std;

double percent(double,int,int,int,int,int);
double tax(double,int,int,int,int,int);
bool isvalid(string);

int main ()
{
cout << "If you are filing taxes as a single, enter s.\n";
cout << "If you are filing taxes as married filing jointly, enter mj.\n";
cout << "If you are filing taxes as married filing separately, enter ms.\n";

string method;
string s, mj, ms;
cin >> method;

cout << "What is your total taxable income? ";
string total;
cin >> total;

while (!isvalid(total))
{
if (isvalid(total))
{
cout << "The income is valid." << endl;
}
else
{
cout << "The income entered is invalid. Please enter a valid amount.";
cin >> total;
}

}

double income;
income=atof(total.c_str());

if (method==s)
{
cout << "Percentage Bracket: " << percent(income,8375,34000,82400,171850,373650) << "%" << endl;
cout << "Income Tax: \$" << tax(income,8375,34000,82400,171850,373650) << endl;
cout << fixed << setprecision(2) << "Actual Percentage of Tax: " << (tax(income,8375,34000,82400,171850,373650)/income)*100 << "%" << endl;
}

else if (method==mj)
{
cout << "Percentage Bracket: " << percent(income,16750,68000,137300,209250,373650) << "%" << endl;
cout << "Income Tax: \$" << tax(income,16750,68000,137300,209250,373650) << endl;
cout << fixed << setprecision(2) << "Actual Percentage of Tax: " << (tax(income,16750,68000,137300,209250,373650)/income)*100 << "%" << endl;
}

else if (method==ms)
{
cout << "Percentage Bracket: " << percent(income,8375,34000,68650,104625,186825) << "%" << endl;
cout << "Income Tax: \$" << tax(income,8375,34000,68650,104625,186825) << endl;
cout << fixed << setprecision(2) << "Actual Percentage of Tax: " << (tax(income,8375,34000,68650,104625,186825)/income)*100 << "%" << endl;
}

return 0;
}

bool isvalid(string str)
{
int first=0;
if (str.length()==0) return false;
if (str.at(0)=='-') return false;
if (str.length() && str.at(first)==0) return false;
for (int i=first; i<str.length(); i++)
{
if (!isdigit(str.at(i))) return false;
}

return true;
}

double percent(double x,int c1,int c2,int c3,int c4,int c5)
{
double b;
if (x<c1)
{
b=10;
}
else if (x<c2)
{
b=15;
}
else if (x<c3)
{
b=25;
}
else if (x<c4)
{
b=28;
}
else if (x<c5)
{
b=33;
}
else
{
b=35;
}

return b;
}
double tax(double x,int c1,int c2,int c3,int c4,int c5)
{
double tax;
if (x<c1)
{
tax=.1*x;
}
else if (x<c2)
{
tax=(.1*c1)+(.15*(x-c1));
}
else if (x<c3)
{
tax=(.1*c1)+(.15*(c2-c1))+(.25*(x-c2));
}
else if (x<c4)
{
tax=(.1*c1)+(.15*(c2-c1))+(.25*(c3-c2))+(.28*(x-c3));
}
else if (x<c5)
{
tax=(.1*c1)+(.15*(c2-c1))+(.25*(c3-c2))+(.28*(c4-c3))+(.33*(x-c4));
}
else
{
tax=(.1*c1)+(.15*(c2-c1))+(.25*(c3-c2))+(.28*(c4-c3))+(.33*(c5-c4))+(.35*(x-c5));
}

return tax;
}
``````

Forget it. I figured it out.

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