validation

[Dan]

I have a very simple validation function, lets say for negative number:
The function is called during a series of questions,
Besides doing exit like I did, is there an easy way so that the program ask
the question again or go back to the previous, accounting that there are
menus

D
int Validate_positive(float &c)
{
if (c < 0)
{ cout<< "You have type a negative integer, Please try again with a
positive number! " <<endl;

exit(1); } //exits the program and starts over with a positive number
return 0;
}

[Kai-Uwe Bux]

Dan wrote:

I have a very simple validation function, lets say for negative number:
The function is called during a series of questions,
Besides doing exit like I did, is there an easy way so that the program
ask the question again or go back to the previous, accounting that there
are menus

D
int Validate_positive(float &c)
{
if (c < 0)
{ cout<< "You have type a negative integer, Please try again with a
positive number! " <<endl;

exit(1); } //exits the program and starts over with a positive number
return 0;
}

Hi,
this routine seems to be the wrong place to do the fix. Somewhere in your
code there is probably a part that looks like this:

...
std::cout << "Please enter a non-negative number: "
<< std::endl;
std::cin >> my_very_dear_non_negative_float;
if ( Validate_positive( my_very_dear_non_negative_float ) {
...
}

Now, if you want to pester the user until a non-negative number is entered,
you will need a loop:

...
std::cout << "Please enter a non-negative number" << std::endl;
std::cin >> my_very_dear_non_negative_float;
while ( my_very_dear_non_negative_float < 0 ) {
std::cout << "Can't you read, I said non-negative! Try again dummy: "
<< std::endl;
std::cin >> my_very_dear_non_negative_float;
}
...
Best

Kai-Uwe

[Mark A. Gibbs]

Kai-Uwe Bux wrote:

while ( my_very_dear_non_negative_float < 0 ) {
std::cout << "Can't you read, I said non-negative! Try again dummy: "
<< std::endl;
std::cin >> my_very_dear_non_negative_float;
}

charming ui you have there ^_^

indi

[Phlip]

Mark A. Gibbs wrote:

Kai-Uwe Bux wrote:

while ( my_very_dear_non_negative_float < 0 ) {
std::cout << "Can't you read, I said non-negative! Try again dummy: " << std::endl;
std::cin >> my_very_dear_non_negative_float;
}

charming ui you have there ^_^

The snotty CMD.EXE admonition, "'blah' is not recognized as an internal or
external command, operable program or batch file," always reminds me of
Lilly Tomlin portraying a snotty telephone operator...

--
Phlip
http://industrialxp.org/community/bi...UserInterfaces