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Converting to a int and back

Posted on 2002-03-05
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Last Modified: 2010-04-01
Hi,
I need help on this. I know this will sound like homework, but it actually isn't. I know this sounds like it's right out of a textbook, but it's not. Here it goes:
For functionality I want to add to a program I'm working on, I want to convert a char to an int, subtract 1 from it's value and make a new char out of it. How would I do this?
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Question by:xebra19
8 Comments
 

Author Comment

by:xebra19
ID: 6843561
unless there's an easier way to accomplish this.
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LVL 30

Expert Comment

by:Axter
ID: 6843619
char f[32] = "Hello World";

int x = f[2];
--x; //x=x-1
f[2] = x;
printf(f);
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LVL 30

Accepted Solution

by:
Axter earned 50 total points
ID: 6843622
char f[32] = "Hello World";

int x = f[2];
--x; //x=x-1
char NewChar = x;
//NewChar now equals 'k'
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LVL 2

Expert Comment

by:dbaora
ID: 6843652
Hi,
you can use built in function in ANSI C/WIN 95:

// ANSI + WIN 95
convert string to int:
atoi(const char *string);

// ANSI + WIN 95
convert string to float:
atof(const char *string);

// ANSI + WIN 95
convert string to long:
atol(const char *string);

// WIN 95
convert int to string:
_itoa(int i);

// WIN 95
convert long to string:
_ltoa(long l);

regards,
dbaora
0
 
LVL 12

Expert Comment

by:pjknibbs
ID: 6843685
Why not just use:

char ch = 'A';

ch--;

You can add and subtract directly from the char--no need for an intermediate integer.
0
 
LVL 2

Expert Comment

by:jonnin
ID: 6847087
yes. Type char IS an int, values from 0 - 255 or    
-127 to 128.  Just treat it as an int, using an ascii table to do whatever it is you are doing.  
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LVL 11

Expert Comment

by:griessh
ID: 6955268
Dear xebra19

I think you forgot this question. I will ask Community Support to close it unless you finalize it within 7 days. You can always request to keep this question open. But remember, experts can only help you if you provide feedback to their questions.
Unless there is objection or further activity,  I will suggest to accept

     "Axter"

comment(s) as an answer.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!
======
Werner
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Author Comment

by:xebra19
ID: 6958659
sorry about the neglected question
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