Tax program using strings, error message

[cbar]

I keep getting an error message that I need to declare 'i' for the scope of my 'for' statement everytime i try to compile my program, i've tried to declare it everywhere in the scope and keeps giving me the same error message.. any help is appreciated, thanks. This is the error I'm getting:
In function ‘std::string convertletters(std::string)’:
4.cpp:81:6: error: ‘inti’ was not declared in this scope
for (inti=1;i<s.length();i++)
^
4.cpp:81:13: error: ‘i’ was not declared in this scope
for (inti=1;i<s.length();i++)

[code]
#include <iostream>
#include <string>
#include <cctype>
#include <iomanip>

using namespace std;

string convertletters(string);
double cal_taxable_income(double, int);
double cal_deduction(string);
int cal_tax_rate(double, string);

int main()
{

string name, status, deduction, temp, s;
int no_depen, i, tax_rate;
double gross_income, tax_withheld, taxable_income, tax;
while(cin>>name)
{
taxable_income=0.0;
tax_rate=0;
tax=0.0;
name=convertletters(name);
cout << "Tax summary for "+ name+" family" <<endl;
cin>>status;
status=convertletters(status);
cout << "Filing status: " +status << endl;
cin >> no_depen;
string dependents [no_depen];
for (i=0;i<no_depen;i++)
{
cin >> dependents[i];
dependents[i]=convertletters(dependents[i]);
}
cout << "Dependents: " ;
for(i=0;i<no_depen;i++)
{
if(i==no_depen-1)
cout << dependents[i] << endl;
else
cout << dependents[i]+" , " ;
}

cin >> gross_income;
cout << "Gross income: " << setw(9) << " $ " << setw(9) << setprecision(2) << fixed << gross_income << endl;
cin >> tax_withheld;
taxable_income=cal_taxable_income(gross_income, no_depen);
cout << "Exemptions: " << setw(11) << " - " << setw(9) << setprecision(2) << fixed << 1200.0*no_depen << endl;
cin >> deduction;
deduction=convertletters(deduction);
double deduction_amount = 0.0;
deduction_amount=cal_deduction(deduction);
taxable_income=deduction_amount;
if(taxable_income<0)
taxable_income=0.0;
cout << "Taxable Income: " << setw(16) << setprecision(2) << fixed << taxable_income << endl;
tax_rate=cal_tax_rate(taxable_income,status);
cout << "Tax rate: " << setw(22) << tax_rate << "\%" << endl;
tax=(taxable_income*tax_rate)/100.00;
cout << "Taxes payable: " << setw(17) << setprecision(2) << fixed << tax << endl;
cout << "Taxes withheld: " << setw(7) << " - " << setprecision(2) << fixed << setw(9) << tax_withheld << endl;
tax=tax-tax_withheld;
tax=double(tax);
if(tax>0)
cout << "Taxes due: " << setw(12) << " $ " << setprecision(2) << fixed << setw(9) << tax << endl;
else
cout << "Refund due: " << setw(11) << " $ " << setprecision(2) << fixed << setw(9) << (-tax) << endl;
cout << endl;
}
return 0;
}

string convertletters(string s)
{
s[0] =char(toupper(s[0]));

for (inti=1;i<s.length();i++)
{
s[i]=char(tolower(s[i]));
}
return s;
}

double cal_taxable_income(double gross_income, int no_depen)
{
return gross_income-1200*no_depen;
}

double cal_deduction(string deduction)
{
double deduction_amount=0.0;
if(deduction.compare("Standard" ) ==0)
{
deduction_amount=3000.00;
cout << "Standard deduction: - " << setw(9) << 3000.00 << endl;
}
else if(deduction.compare("Itemized" ) ==0)
{
double item_deduction=0.0, temp;
cin >> temp;
while(temp!=0)
{
item_deduction+=temp;
cin >> temp;
}
if (item_deduction>=3000)
{
deduction_amount=item_deduction;
cout << "Itemized deduction: - " << setprecision(2) << fixed << setw(9) << item_deduction << endl;
}
else
{
deduction_amount=3000.00;
cout << "Standard deduction: - " << setw(9) << 3000.00 << endl;
}
}
return deduction_amount;
}
int cal_tax_rate(double taxable_income, string status)
{
int tax_rate;
if(taxable_income<30000)
{ {
if(status.compare("Single") ==0)
tax_rate=4;
else if(status.compare("Married") ==0)
tax_rate=2;
}
else if(taxable_income>=30000 && taxable_income<100000)
{
if(status.compare("Single")==0)
tax_rate=20;
else if(status.compare("Married")==0)
tax_rate=18;
}
else
{
if(status.compare("Single")==0)
tax_rate=35;
else if(status.compare("Married")==0)
tax_rate=30;
}
return tax_rate;
}
[code]

[pnoid]

inti is not the same as int i