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// myui.cpp
// a collection of useful interface functions
// for a C++ console app
#include <iostream>
#include <string>
#include <sstream>
#include <vector>
using namespace std;
// function prototypes
void cls();
void newl(int n = 1);
string get_s();
int get_n(string);
int get_n_range(string, int, int);
bool yesNo(string);
void waitReturn(string);
void title(string, char, bool);
void menu(const vector<string>&, char);
// clear the screen
void cls()
{
// Windows:
system("cls");
// Linux/Unix = system("clear")'
}
// print a newline/blank line to console
void newl(int n)
{
for (int i = 0; i < n; i++)
cout << endl;
}
// return a string that allows a sentence/spaces
string get_s()
{
string input;
getline(cin, input);
return input;
}
// get an integer number
int get_n(string prompt)
{
int number;
string input;
while (true)
{
cout << prompt;
input = get_s();
// converts from string to number safely
stringstream myStream(input);
if (myStream >> number)
break;
else
cout << input << " -> Invalid input" << endl;
}
return number;
}
// ask user for a number within a specified range
int get_n_range(string prompt, int low, int high)
{
int number;
string input;
while (true)
{
cout << prompt << " [" << low << "-" << high << "]: ";
input = get_s();
// converts from string to number safely
stringstream myStream(input);
if (myStream >> number)
{
if (number >= low && number <= high)
break;
}
cout << input << " -> Invalid input" << endl;
}
return number;
}
// ask user for a Y/N reply to a question
bool yesNo(string question)
{
// function returns true for yes, false for no
char reply = { 0 };
string input;
while (true)
{
cout << question << " (y/n): ";
input = get_s();
if (input.length() == 1)
{
reply = toupper(input[0]);
if (reply == 'Y' || reply == 'N')
break;
}
cout << input << " -> Invalid input." << endl;
}
return (reply == 'Y' ? true : false);
}
// print a waiting message. Wait for Enter/Return
void waitReturn(string message)
{
cout << message << " ";
get_s();
}
// print a title with underline or border
void title(string title, char ch, bool border)
{
if (!border)
{
cout << title << endl;
cout << string(title.length(), ch) << endl;
}
else
{
// with a border
cout << string(title.length() + 8, ch) << endl;
cout << string(2, ch) << " " << string(title.length(), ' ')
<< " " << string(2, ch) << endl;
cout << string(2, ch) << " " << title << " " << string(2, ch)
<< endl;
cout << string(2, ch) << " " << string(title.length(), ' ')
<< " " << string(2, ch) << endl;
cout << string(title.length() + 8, ch) << endl;
}
}
// show a menu from a list of items
void menu(const vector<string>& items, char ch)
{
int slen = items[0].length();
cout << string(slen + 8, ch) << endl;
for (unsigned int i = 0; i < items.size(); i++)
{
cout << string(2, ch) << " " << items[i] << " " << string(2, ch)
<< endl;
cout << string(slen + 8, ch) << endl;
}
}
// test functions/usage:
int main()
{
cls();
title("Here is my title", '=', false);
newl();
title("WITH A BORDER", char(29), true);
newl(1);
// create a menu from a vector of strings
vector<string> menu_items;
menu_items.push_back("1 - Edit your name ");
menu_items.push_back("2 - Verify your email");
menu_items.push_back("3 - Call your Mom ");
menu_items.push_back("4 - Exit ");
menu(menu_items, char(22));
newl();
bool lee = yesNo("Is it you Lee?");
if (lee)
cout << "Hello LEEJAM!\n";
else
cout << "Hello.\n";
int age = get_n_range("How old are you?", 0, 100);
if (age != 33)
cout << "Liar!\n";
else
cout << "You are aged " << age << ".";
int fave = get_n("Enter your favourite number: ");
cout << "Lucky number " << fave;
newl(2);
waitReturn("<Hit RETURN to continue>");
newl();
return 0;
}
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