data validation

[Default User]

When you reply with Google Groups, use Preview, then Edit, to get the
replied-to text. Then trim most of it out, leaving enough context that we
can tell to what you replied.

There's a more direct way. Click "show options" and use the Reply shown
in the expanded header. Saves several steps over your method (which
does seem to work, to my surprise).




Brian

 

[gurumare]

Ok, i was finally able to use strtol after looking it up and studying
its structure. my final code looks like this:
void main()
{
char name[20];
cin.getline(name, 20);

const char *strPtr = name;
char *end = NULL;

int val = strtol(strPtr, &end, 10);
cout << val;
getch();

}

this is just a test i set up to make sure i was doing it correctly. If
there is anything else i shoulkd know or change, please let me know,
thanks.

 

[Victor Bazarov]

Ok, i was finally able to use strtol after looking it up and studying
its structure. my final code looks like this:

void main()

int main()

{
char name[20];
cin.getline(name, 20);

const char *strPtr = name;
char *end = NULL;

int val = strtol(strPtr, &end, 10);
cout << val;
getch();

There is no standard function 'getch'. Did you mean 'getchar'?

}

this is just a test i set up to make sure i was doing it correctly. If
there is anything else i shoulkd know or change, please let me know,
thanks.

What do you have your 'end' for? You don't seem to be using the value
you get in it back from 'strtol' in any way...

V

 

[gurumare]

There is no standard function 'getch'. Did you mean 'getchar'?

I included those iostream, and i included conio.h which has the
function getch(); i use it as a quick way to pause my script

What do you have your 'end' for? You don't seem to be using the value
you get in it back from 'strtol' in any way...

i added code later that displayed my 'end' to see if it was working
correctly. i basically set up that code so that if i needed to see what
was there i can.

 

[Paul Roebuck]

Ok, i was finally able to use strtol after looking it up and studying
its structure. my final code looks like this:
void main()
{
char name[20];
cin.getline(name, 20);

const char *strPtr = name;
char *end = NULL;

int val = strtol(strPtr, &end, 10);
cout << val;
getch();

}

this is just a test i set up to make sure i was doing it correctly. If
there is anything else i shoulkd know or change, please let me know,
thanks.

#include <iostream>
#include <cstdlib>
#include <cerrno>


int atoi(const char* nptr)
{
char *endptr;

errno = 0;
int value = static_cast<int>(std::strtol(nptr, &endptr, 10));
if (*nptr == '\0' || *endptr != '\0')
throw std::invalid_argument(buf);
if (errno)
throw std::range_error(buf);

return value;
}


int main()
{
try
{
char buf[20];
std::cin.getline(name, sizeof(buf));
std::cout << atoi(buf) << std::endl;
}
catch (std::exception& e)
{
std::cerr << e.what() << std::endl;
}

return 0;
}