Question

In C, how to I convert a string, like "0xffffff0", into an integer with the value 0xfffffff0

Answer 1

in other words, how do I convert a string that represents a hex number into an integer containing the value of that number?

Answer 2

you want algorhitm? or just use built in function or library?

Answer 3

convert string to char, just ffffff, i think you know how to do it, but I don't then
main //blablab idk what to write here
{
int decimal =0
for (int index = 0; index < 6; index++)
{
//convert char to integer
power = 5;
int integer = charToInt(char[index]);
decimal += pow(integer, power);
power--;
}
printf("%d", decimal); //idk how to print
}

// idk how to write function in C but it takes character returns string
function int charToInt(char character)
{
switch(character):
case '0' : return 0;
case '1' : return 1;
...//repeat same
case 'a' : return 10
case 'b' : return 11
case 'c' : return 12
case 'd' : return 13
case 'e' : return 14
case 'f' : return 15
default : return 0
}

Answer 4

I just want to replace scanf with something else in this program: http://ideone.com/iK83i

Answer 5

sorry but i don't understand that code with weird c syntax :D

Answer 6

Just out of pure curiosity, why are you writing a program to read arbitrary blocks of memory. That just sounds like a potion for trouble! Ha!

That said, you could replace it with gets - which will return a string from the standard in. There are lots of other options as well, I suppose. What do you need to do that scanf won't?

Answer 7

Gah, 10 points for forgetting a question mark at the end of my first sentence.

Answer 8

where's edit button?
and also he does a lot weird stuff with weird c language :D

Answer 9

We haven't implemented an edit button yet, unfortunately. I'm going to suggest it to shadowfiend when I think to.

And it's not so much weird stuff as it is interesting. He's running into a lot of interesting problems and concepts.

Answer 10

i think edit button was suggested bazilion times :P

Answer 11

It has, and we've explained the rationale for it being extremely low priority an equally large number of times.

Answer 12

agdgdgdgwngo, have a look at sscanf. It does the same thing as scanf, only it reads from a string instead of standard input.

Answer 13

what a scanf does ?