char to int

Dev Shed Forums Sponsor:

January 24th, 2005, 01:58 AM

doneirik

Registered User

Join Date: Dec 2004

Posts: 24

Time spent in forums: 5 h 50 m 17 sec
Reputation Power: 0

char to int

..good morning

could anybody tell me how to convert a char to an int in C++ (and which file I need to include)

doneirik

January 24th, 2005, 02:10 AM

wannabe

=) wannabe?

Join Date: Jul 2002

Location: florida

Posts: 2,153

Time spent in forums: 21 h 58 m 25 sec
Reputation Power: 13

you dont need to include anything extra

Code:

char charVar = 'A';
int intVar = 0;

intVar = charVar; // charVar will be converted to int

intVar = static_cast<int>(charVar); // charVar will converted to int and you wanted it to =D

with the static_cast<>() thingy it's pretty much that you force a conversion you meant to happen. maybe char to int isnt the best example. but say if u convert float to an int purposefully it's useful. it's also used for other things i dont know about yet =)

__________________
Free Random Signature , Avatar Hosting
http://freebsd.munk.nu/
http://jez.hancock-family.com/

Last edited by wannabe : January 24th, 2005 at 02:22 AM.

January 24th, 2005, 05:12 AM

Jaspreet Singh

Getting my *facts* right

Join Date: Mar 2004

Location: Amritsar, India

Posts: 177

Time spent in forums: 1 Day 17 h 40 m
Reputation Power: 10

and if the char contains a digit and you want that, then subtract 48 from the char.
Eg:

Code:

char ch='8';
int a;
a = ch-48;//a now contains 8.

also you can check the char to see if it's a digit or not using isdigit() function.

__________________
IMHO

January 24th, 2005, 05:13 AM

DaWei_M

Renaissance Redneck

Dev Shed God 8th Plane (8500 - 8999 posts)

Join Date: Jan 2004

Location: Central New York. Texan via Arizona, out of his element!

Posts: 8,509

Time spent in forums: 4 Weeks 17 h 53 m 58 sec
Warnings Level: 20
Number of bans: 3
Reputation Power: 3268

The compiler will automatically make certain promotions when you assign one type of variable to another. Good investment to read your language/compiler documentation on coffee breaks or something.

__________________
Functionality rules and clarity matters; if you can work a little elegance in there, you're stylin'.
If you can't spell "u", "ur", and "ne1", why would I hire you? 300 baud modem? Forget I mentioned it.
DaWei on Pointers Politically Incorrect.

January 24th, 2005, 09:26 AM

jim mcnamara

......@.........

Join Date: Jun 2004

Posts: 1,345

Time spent in forums: 1 Week 4 Days 38 m 38 sec
Reputation Power: 54

Promotion from char to int occurs as specified as specified in the ANSI standards- for example passing a char as an argument to a function, or anytime you reference a char and an int in the same statement. In these cases a "cast" or promotion occurs whether you are aware of it or not.

Sometimes, it's good programming practice to cast even if you know it is gonna happen anyway. This lets the next guy see that:
1. you wanted it to happen
2. or you were aware of it.

These hidden promotions sometimes cause unintended side-effects.

Developer Shed Advertisers and Affiliates