Change length of dashed line to match input string length? - c++

Question

#include <iostream>
#include <string>
using namespace std;
int main()
{
string name;
int income;
int tax;
cout << "What is your full name? ";
getline(cin,name);
cout << "What is your annual income? ";
cin >> income;
if (income < 50000)
{
tax = income*0.33;
}
else { tax = income*0.38; }
cout << "\t\t\t" << name << ": Tax Report" << endl;
cout << "\t\t\t" << "-------------------------" << endl;
cout << "Income =$" << income << endl;
cout << "Tax =$" << tax << endl;
system("pause");
return 0;
}
I would like the line of hyphens to match the length of the name string regardless of its length. I am in an introductory c++ class and I am sure there is a simple way to do this. Could anyone help?

Answer 1

cout << "\t\t\t" << string(name.length() + 12, '-') << endl;

Answer 2

just put in this line, instead of your current dash line
cout << "\t\t\t" << std::string(name.length(), '-') << endl;
for further information see http://en.cppreference.com/w/cpp/string/basic_string/basic_string

Answer 3

You can do it the following way
#include <iostream>
#include <iomanip>
int main()
{
std::string name( "01234567890" );
std::cout << "\t\t\t" << name << ": Tax Report" << std::endl;
std::cout << "\t\t\t" << std::setfill( '-' ) << std::setw( name.size() )
<< '-' << std::endl;
return 0;
}
The program output is
01234567890: Tax Report
-----------
If you want that all preceding line would be underlined then you need tp add the size of string ": Tax Report" to the argument of std:;setw For example
#include <iostream>
#include <iomanip>
int main()
{
std::string name( "01234567890" );
std::cout << "\t\t\t" << name << ": Tax Report" << std::endl;
std::cout << "\t\t\t" << std::setfill( '-' ) << std::setw( name.size() + 12 )
<< '-' << std::endl;
return 0;
}
In this case the porgram output is
01234567890: Tax Report
-----------------------
Thus all you need is to use functions std::setfill and std::setw declared in header <iomanip>. There is no need to a create a temporary object of type std::string because it is inefficient..

Answer 4

You can make a string of hyphens of a certain length. Get the length by first building a string for the name line and then calling its length method. Here is an example:
std::string hyphens;
hyphens.assign(length, '-');
check out thislink for more details on using strings:
http://www.cplusplus.com/reference/string/string/