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char  convert

Posted on 2003-11-24
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Last Modified: 2010-04-01
hi,
i  wanna convert  char,which is read from a  data, convert  into the type  int.
i have tried  
(int)char;
and
int tmp; tmp = char;
but  it returns the ASCII number,
emaple: char  ch = '6';
(int)ch = 54

how can i do it?
and which head date should i add?
0
Comment
Question by:iux
9 Comments
 
LVL 9

Expert Comment

by:tinchos
ID: 9810058
Try using

#include <stdlib.h>


char number = '6';
int temp = atoi( number );

and in temp will be equal to 6

Hope this helps

Tincho
0
 

Author Comment

by:iux
ID: 9810076
hmmmmmmmmmmm
it  says
invalid conversion from `char' to `const char*'
0
 
LVL 39

Accepted Solution

by:
itsmeandnobodyelse earned 300 total points
ID: 9810087
No, atoi wants a char* - char pointer - and not a single char.

if you have a single digit in a char you may do this:

  char c = '9';

  int    i  = c - '0';

maybe you should check before:

   if (c >= '0' && c <= '9')
   {
        int i = c - '0';
        ...
   }

if you have a number and not a digit, you may use atoi

   char cn[] = "123";   // that i a zero-terminated string
   int    i      = atoi(cn);

Regards, Alex


0
 
LVL 17

Expert Comment

by:rstaveley
ID: 9810103
char number = '6';
int temp =  number-'0';
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LVL 3

Expert Comment

by:RJSoft
ID: 9811279
#define MAX ??
char arr[MAX];
char number='6';
arr[0]=number;
arr[1]='\0';

int val = atoi(arr);

RJ
0
 
LVL 4

Expert Comment

by:n_fortynine
ID: 9812270
rstaveley's solution is simple and clean. Why go through all these complexity? :D
0
 

Author Comment

by:iux
ID: 9812856
ok
i try it
thanks a lot
0
 
LVL 4

Expert Comment

by:void_main
ID: 9816957
... and what will you do if the number is something like this: 12345 ???

this will not work 'cause "12345" is not a single char!

therefore this will do it, and even with one char!

look:


char *number = "12345";
int realNumber = atoi(number);

but don't do this:
char *number = '12089';
or
char *number = '2';

best regards
void_main
0
 

Author Comment

by:iux
ID: 9824981
thx :-)
0

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