How to convert char to integer in C? [duplicate]

Question

Possible Duplicates:
How to convert a single char into an int
Character to integer in C

Can any body tell me how to convert a char to int?

char c[]={'1',':','3'};  int i=int(c[0]);  printf("%d",i); 

When I try this it gives 49.

Answer 1

In the old days, when we could assume that most computers used ASCII, we would just do

int i = c[0] - '0'; 

But in these days of Unicode, it's not a good idea. It was never a good idea if your code had to run on a non-ASCII computer.

Edit: Although it looks hackish, evidently it is guaranteed by the standard to work. Thanks @Earwicker.