Searching in a string for ints?

[The Midnighter]

I'm trying to search a string for numbers, to ensure that it only contains numbers and no characters - what's the easiest way to do this?

I thought it might be something likkkeee...
size_t x;
string y;

x = y.find('0-9');
if (x!=npos::strin g)
{
// if it contains anything but 0-9, exec code
}
else
{
// yeah
}

but, it doesn't seem to be working at all, yeeeah I'm sure that's a foolish way I just c an't think of any other way =(

Alright, new idea.. What if I convert it to a c string, and then convert it back later? that should get rid of any alphanumeric characters...

[weaknessforcats]

Just call isdigit() using each character of the string or code:
[code=c]
if (str[i] >= 0 && str[i] <= 9)
{
//it's a digit
}
else
{
//no it's not
}
[/code]

[The Midnighter]

Just call isdigit() using each character of the string or code:
[code=c]
if (str[i] >= 0 && str[i] <= 9)
{
//it's a digit
}
else
{
//no it's not
}
[/code]

Alright.. What's [i] supposed to be? str would be my string of course..

[weaknessforcats]

The element in the string:

string str("Hello");

str[1] is the e of Hello.

str[i] is the same thing where i is your loop counter.

[The Midnighter]

The element in the string:

string str("Hello");

str[1] is the e of Hello.

str[i] is the same thing where i is your loop counter.

....
What?

so i is... a loop, that does what?

Anyway, here's some code I'm working with now:

[code=cpp]
string str(n1);
string str2(d1);
istringstream strin2(str2);
istringstream strin(str);

strin >> c;
strin2 >> d;
cout << "c = " << c << "\nd = " << d << "\n";
if (!((c<=0) || (c>9)) || (d<=0) || (d>9))
{
cout << "Error - Enter an int!\n";
cout << "c = " << c << "\nd = " << d << "\n";
move = true;
}[/code]

[weaknessforcats]

What?

so i is... a loop, that does what?

A loop that examines each character in your string:
[code=cpp]
string str("Hello123") ;

for (int i = 0; i < str.size(); ++i)
{
if (str[i] ....etc...
}
[/code]

[The Midnighter]

:D Found a solution!
[code=cpp]
pos = second.find('/'); // Searches for the '/'
d2 = second.substr(p os+1); // 1 space after '/'
n2 = second.substr (0,pos); // from beginning to '/'
space = second.find_fir st_of(" "); // Searches for a space


string str(n2);
string str2(d2);
istringstream strin2(str2);
istringstream strin(str);

strin >> e;
strin2 >> f;
cout << "e = " << e << "\nf = " << f << "\n";
if (((e>9999) || (e<=-9999)) || (f>9999) || (f<=-9999)) // Checks if its below -9999, or above 9999
{
cout << "Error - Enter an int!\n";
cout << "e = " << e << "\nf = " << f << "\n";
e = 0;
f = 0;
move = false;
}[/code]