RE: Implimenting prompts in program for reinput from user?
- From: "Delaunay Christophe" <christophe.delaunay@xxxxxxxxxxxxxxx>
- To: <programmingblind@xxxxxxxxxxxxx>
- Date: Tue, 20 Jul 2010 13:34:02 +0200
Hi Jes,
Here is a sample piece of code which could perform what you requested.
------ BEGINNING OF CODE ------
// --- The needed headers ---
#include <iostream>
// You may add "using namespace std" in order to avoid typing "std::"
// in front of each call to cout, cin or endl. I did not do it.
int main(void) {
char c = '\0'; // The character to read
std::cout << "This is a sample." << std::endl;
do { // The loop itself
std::cout << "Please enter a command : ";
std::cin >> c; // reads the command
switch (c) { // to parse the command
case '1' :
std::cout << "I perform job for command 1." <<
std::endl;
break; // I don't want to execute following
cases
case '2' :
std::cout << "I perform job for command 2." <<
std::endl;
break; // I don't want to execute following
cases
case '3' :
std::cout << "I perform job for command 3." <<
std::endl;
break; // I don't want to execute following
cases
case 'e' :
case 'E' : // please understand both cases as 'e' or 'E'
std::cout << "I am requested to end." <<
std::endl;
break; // I don't want to execute the "default"
statement
default :
std::cout << "Sorry. I did not recognize your
command." << std::endl;
} // end of switch on character c
} while ( (c != 'e') && (c != 'E') );
// at end of loop, I only need to return
std::cout << "I am finished!" << std::endl;
return 0;
} // end of main
------ END OF CODE ------
In this piece of code, I made the important assumption that the commands
are always one character long.
And now, here is a sample of what happens when I launch this small piece
of code on my linux box:
------ BEGINNING OF OUTPUT ------
[delaunayc@rennxlxrda013 Test]$ ./LittleTest
This is a sample.
Please enter a command : 1
I perform job for command 1.
Please enter a command : a
Sorry. I did not recognize your command.
Please enter a command : e
I am requested to end.
I am finished!
[delaunayc@rennxlxrda013 Test]$
------ END OF OUTPUT ------
HTH, Have a nice day. Chris D
-----Original Message-----
From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Jes
Sent: mardi 20 juillet 2010 12:36
To: programmingblind@xxxxxxxxxxxxx
Subject: Implimenting prompts in program for reinput from user?
Say I want a user to enter a number from 1 to 3, but they enter
something else, like 4, or the letter v, or whatever. How would I tell
the program to display an error message to the user using cout, then
return them to the initial prompt?
Thanks.
Jes
__________
View the list's information and change your settings at
//www.freelists.org/list/programmingblind
Other related posts:
