Two Dimensional Sort

[logic4fun]

Hi all,
i am looking out for sorting a two dimensional array where i have to sort the first column of a two-column
array, and I want the second column moved along with the first one. Here is an example
24,2
36,4
18,3

should look like

18,3
24,2
36,4

so basically i want to arrange the first column in ascending order where the second column should simply move along..
Thanks in advance
Logic4Fun

 

[palbano]

Look at java.util.Arrays and java.lang.Comparable

-pete

 

[palbano]

Oh my....



-pete

 

[logic4fun]

I Want in C only as it goes with some other C program

 

[dlkfjdlkfjdlfkd]

Here's the "qsort" way. Depending on your data set and requirements, this may or may not be the appropriate method.

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

int compare(const void *a1, const void *a2)
{
const int *array1 = a1;
const int *array2 = a2;

if (*array1 < *array2)
return -1;
else if (*array1 > *array2)
return 1;
else
return 0;
}

int main(void)
{
int i;
int array[5][2] = { { 1, 2 }, { 2, 2 }, { 0, 4}, { 15, 26 }, { 3, 9 } };

qsort(array, sizeof array / sizeof *array, sizeof *array, compare);

for (i = 0; i < sizeof array / sizeof *array; ++i)
printf(&quot;[%d][%d]\n&quot;, array[0], array[1]);
return 0;
}

 

[dlkfjdlkfjdlfkd]

Something tells me Pete forgot which forum he was in.