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j0hnb

09-12-2004 01:36 PM

[c++] string into int?

Here is my delema, I scaned in a full line using getline, it would scan in something like 10:45 Pm, how can I take the 10 and put it into an int and then take the 45 and put it into another int? Thanks.

kel	09-12-2004 01:43 PM

There is a function called printf or sprintf that can help you convert strings to in. Google "String to int" or "Convert string to int".

Google is a programmers second best friend, second only to java...

Pragma

09-12-2004 03:45 PM

The function atoi() turns a char* into an integer, with certain constraints.

There can be whitespace in front of the integer, but no alphabet characters. The number stops when a non-integer character is read.

Valid strings to pass to atoi():
" 103a39" -> 103
"9438745" -> 9438745
"-394" -> -394

Invalid strings:
"a5445a"
".25465"

bacon

09-12-2004 05:56 PM

Something else you might want to consider, parsing out "10:45 pm" as a string and using strptime() to convert it to a time structure.

j0hnb

09-13-2004 04:36 AM

I didn't even know there was a time structure, i'll try it out, thanks

roboshark

09-13-2004 05:01 AM

Use strtol().

(Error and sanity checks omitted)

Code:

char *ptr = "10:45pm";

char *endptr;

int hours, min;



hours = strtol(ptr, &endptr, 0);

/* endptr now set to ":45pm" */

if (endptr == NULL  || *endptr != ':')

       report_error("time format");

endptr++;

ptr = endptr;



min = strtol(ptr, &endptr, 0);



/* endptr now set to "pm" */

ketamine

09-13-2004 10:24 AM

You could also use a stringstream:

Code:

#include <sstream>



// ...

// input = "10:45 pm"

std::stringstream buffer(input);

int iHours, iMinutes;

char c;

buffer >> iHours >> c >> iMinutes;

a-j	09-14-2004 04:48 PM

I think what you want is sscanf, which does the "opposite" what printf does
Something along the lines of (untested):

sscanf(string, "%i:%i", &hour, &min);

MXL	09-16-2004 01:49 PM

use sscanf, note: sscanf will return the number of tokens scanned.

CString sMyString = "10:45";
if (sscanf (sMyString, "%d:%d", &nHour, &nMinute) != 2)
{
// error
}

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