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/*
* File: simpio.cpp
* ----------------
* This file implements the simpio.h interface.
*/
#include <fstream>
#include <iostream>
#include <sstream>
#include <string>
#include "simpio.h"
using namespace std;
/*
* Implementation notes: getInteger, getReal
* -----------------------------------------
* Each of these functions reads a complete input line and then uses the
* <sstream> library to parse that line into a value of the desired type.
* If that fails, the implementation asks the user for a new value.
*/
int getInteger(string prompt) {
int value;
string line;
while (true) {
cout << prompt;
getline(cin, line);
istringstream stream(line);
stream >> value >> ws;
if (!stream.fail() && stream.eof()) break;
cout << "Illegal integer format. Try again." << endl;
if (prompt == "") prompt = "Enter an integer: ";
}
return value;
}
double getReal(string prompt) {
double value;
string line;
while (true) {
cout << prompt;
getline(cin, line);
istringstream stream(line);
stream >> value >> ws;
if (!stream.fail() && stream.eof()) break;
cout << "Illegal numeric format. Try again." << endl;
if (prompt == "") prompt = "Enter a number: ";
}
return value;
}
/*
* Implementation notes: getLine
* -----------------------------
* The getLine function simply combines the process of displaying a
* prompt and reading an input line into a single call. The primary
* reason for including this function in the library is to ensure
* that the process of reading integers, floating-point numbers, and
* strings remains as consistent as possible.
*/
string getLine(string prompt) {
string line;
cout << prompt;
getline(cin, line);
return line;
}
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