CODEWITHSUNDEEP
carrayspointerschartype-conversion
Jamie1596
Jamie1596

Reputation: 104

Convert Array of Dates into Integers

I am using the C programming language. I currently have a two dimensional character array of dates in this format "2010-05-01". I would like to convert each number into the integer data type and then store them in an integer array. The reason for this is because I need to have an single dimensional array of integers that I can then pass to a function by reference using pointers.

Please see my current code below:

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>

int main()
{
    float values[] = { //Contains 100 float literals }
    int i, j, size = sizeof(values)/sizeof(*values);
    char strings[][10] = {"2010-05-01", "2010-10-01" //Contains a total of 100 dates}
    int dates[size * 3];

    for (i = 0, j = 0; j < size; ++i, ++j) {
        dates[i] = atoi(strtok(strings[j], "-"));
        dates[++i] = atoi(strtok(NULL, "-"));
        dates[++i] = atoi(strtok(NULL, "-"));
    }

    for (i = 0; i < size; ++i)
        printf("%d\n", dates[i]);
    return 0;
}

This code currently returns a bus error and I do not see why. I am a relative beginner, so sorry if I have done something silly. Any comments would be appreciated and thank you for your time.

Upvotes: 2

Views: 1460

Answers (2)

daouzli
daouzli

Reputation: 15328

To extract independently the year, the day and the month and putting them in a same array, you can put together the years, followed by the months and then the days (supposing that a date is formated as yyyy-mm-dd). Such an array could store the following sequence:

y1, y2, y3, m1, m2, m3, d1, d2, d3

The following code do that kind of thing in the array ymd

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define SIZE 2

int main()
{
    int i;
    char strings[SIZE][11] = {"2010-05-01", "2010-10-01" };
    int ymd[SIZE*3];

    for (i = 0; i < SIZE; i++) {
        ymd[i*3] = atoi(strtok(strings[i], "-"));
        ymd[i*3+1] = atoi(strtok(NULL, "-"));
        ymd[i*3+2] = atoi(strtok(NULL, "-"));
    }

    for (i = 0; i < SIZE; i++)
        printf("%d/%d/%d\n", ymd[i*3], ymd[i*3+1], ymd[i*3+2]);
    return 0;
}

The output will be:

2010/5/1
2010/10/1

Upvotes: 1

Edward Clements
Edward Clements

Reputation: 5132

char strings[][10] should be char strings[][11] to take the trailing null character into account.

You seem to be parsing each date into three entries into the dates array -- is that the intention?

Upvotes: 1

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