how to convert charcter to integer

husniteja · 08-30-2004, 08:30 AM

dear all

i want to convert some character to integer, example

Code:

char status[5];
printf("enter your status\n");
scanf("%s",status);

i need the status convert to integer so i can use it with switch ... case statement

thanks, i running in visual C++

kev82 · 08-30-2004, 08:57 AM

depends if your using c or c++ but as your code is in c, i'll give you the c solution, the function you want is atoi(), check out msdn or whatever documentation visual c++ has.

Stor_G · 08-30-2004, 08:57 AM

use the function atoi for integer
and atol for long integer.
'man atoi' for more info.

edit: fixed typo

husniteja · 08-30-2004, 09:12 AM

hi kev, thanks for this answer

but how to back it to array of charcter, i mean convert integer to array

Stor_G · 08-30-2004, 09:17 AM

in order to convert an integer to a character, i use sprintf.
i do something like this:

Code:

#include <stdio.h>
char[50] arrcBuffer;

int nNum = 321;

sprintf(arrcBuffer, "%d", nNum);

hope this helps.

husniteja · 08-30-2004, 09:23 AM

hi stor

Thanks for your answer ^-^

Stor_G · 08-30-2004, 09:29 AM

happy to be of service

just be careful not to overflow the buffer.
using sprintf, without input verification, might cause a buffer overrun bug and possibly a security threat.

so if you allocate a buffer of 50 chars, make sure that the number isn't bigger than 50 digits.
another option a bit more complicated and not necessarily better is to dynamically allocate the memory according to the size of the input.
only problem is the question of who needs to free the memory.
if that is not a problem for you, you might want to choose the latter option.

cheers.