TO convert a character into integer

[iaslam]

How can we convert a character into integer
char a[40]
my input to this may be like 21466845687552
now i want to access each element and want to convert it into integer and then apply aritmatic operation can i do this???????

[Girish Kanakagiri]

How can we convert a character into integer
char a[40]
my input to this may be like 21466845687552
now i want to access each element and want to convert it into integer and then apply aritmatic operation can i do this???????

Use function atoi()

This will convert character to integer.

Regards,
Girish.

[archonmagnus]

I try to avoid atoi(). In C++, it is better (in my opinion) to use stringstreams. Try this:

#include <sstream>
 
char a[40];
int  integerValue[40];
stringstream foo;
 
// ... read in character array...
 
// This connverts the character array from char to int
for (int i = 0; i < 40; i++)
{
    foo<<a[i];
    foo>>integerValue[i];
}
 
// ... do your manipulations, etc. ...
 

Of course, the code is a bit more robust if you use vectors instead of arrays. Then, you aren't limited to fixed sizes.

[weaknessforcats]

I think the OP said each element of the array had top be converted to an integer.

If that's the case, all you do is:

char a[40];
 
int i = a[1] - 48;
 

Fashion a loop around this and off you go.

[JosAH]

I think the OP said each element of the array had top be converted to an integer.

If that's the case, all you do is:

char a[40];
 
int i = a[1] - 48;
 

Fashion a loop around this and off you go.

Yuck, that fails miserably on EBCDIC machines (IBM). Better make that:

int i = a[1] - '0';
 

kind regards,

Jos ( <--- nitpicker ;-)

[weaknessforcats]

Yuck, that fails miserably on EBCDIC machines (IBM). Better make that:

Really? Are you saying that C on a 370 isn't ASCII??

EBCDIC is a 16 bit character set. So, sizeof(char) is 2 bytes and all the C library funcitons (and the sorts since EBCDIC sorts differently from ASCII) have been rewritten to EBCDIC??

Really??

[JosAH]

Really? Are you saying that C on a 370 isn't ASCII??

EBCDIC is a 16 bit character set. So, sizeof(char) is 2 bytes and all the C library funcitons (and the sorts since EBCDIC sorts differently from ASCII) have been rewritten to EBCDIC??

Really??

Last time I checked, EBCDIC was also an 8 bit character encoding. Have a look
at this table. EBCDIC used 8 bits all the time where ASCII used only 7 bits;
the 8th bit came into play when they realized that they had to go 'international' ;-)
IBM never had those intentions; quite smart actually because ASCII lacks the
bitwidth for true Unicode anyway (except for those UTF/8 hacks).

This is a nice link that clearly shows where EBCDIC came from.
And where it's going ;-)

kind regards,

Jos

ps. There's no need to re-implement anything w.r.t. the sort method, i.e. the
things just get sorted according to EBCDIC, that's all.

[JosAH]

EBCDIC is a 16 bit character set. So, sizeof(char) is 2 bytes and all the C library funcitons (and the sorts since EBCDIC sorts differently from ASCII) have been rewritten to EBCDIC??

(forgot to reply to this part of your reply)

If doesn't matter how many bits are in a char. The sizeof() operator returns 1 by
definition. All that matters is that sizof(char) <= sizeof(short) <= sizeof(int) etc.
and their minimum maximal values as defined in limits.h.

e.g. on a typical old ARM processor a char might be 32bits and all sizeof()
values would be equal to 1.

kind regards,

Jos

ps. I don't think there were C implementations for those old Arms; I might be wrong.

[weaknessforcats]

I guess I remembered EBCDIC as more than 8 bits.

However, it was really cruel to bring up an 029 key punch. To this day I can still read those Hollerith punches.

Thank you for straightening me out again.

[JosAH]

I guess I remembered EBCDIC as more than 8 bits.

However, it was really cruel to bring up an 029 key punch. To this day I can still read those Hollerith punches.

Thank you for straightening me out again.

I remember those IBM 29s too; remember that 'control card' behind that little
window in the middle of that noisy thing? You could actually program that darn
thing a bit, like advance to position so-and-so before typing; release the card
after position so-and-so; oh the utmost fun we had sabotaging these things! ;-)

kind regards,

Jos

[maan]

i hope this programe will convert character into integer

<complete spoonfed code deleted>

Don't supply full code solutions. Read this part of the guidelines.

Please don't do this again; you stand the risk of a ban.

kind regards,

Jos