Problem with Casting.

#include <iostream.h>
#include <stdlib.h>

int main()
{
int j;
char k[4]= "123";

j = static_cast<int>( k[0]);
cout<<j<<endl;


system("PAUSE");
return 0;
}
I am writing a program where i receive a string with numbers in it. My program has to validate those numbers. I try to cast the numbers to an intiger for easier validation.
This program will run om win. using Borland.
The problem i'm having is that j contains the dec value of of 1.
I want j to comtain the number 1 not the decimal value of 1.
How do i do that.

Quote:

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The problem i'm having is that j contains the dec value of of 1.

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no it doesnt it will contain the ascii value
what you want is the decimal value which is 1 itself;

so do

Code:

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j = static_cast<int>( k[0]) - '0';

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btw the decimal value of is 1

This is not a real problem.

In ascii 48 - 57 = 0 - 9

so one easy thing to do is this.
You don't even need the static cast.

1: char t;
2: int k;
3: t = 5;
4: k = (int)t;


now k will equal 53 because 48 + 5 is 53

What I do to check is just check if the char value is between 48 and 57.

now if you want the integer value to be the same as the number in the character replace line four with this.
k = (int)t - 48.

If you need to include decimal numbers you must also check if a character is equal to 46 which is the '.' character