sorting numbers in arrays

[houksyndrome]

I have another question. This one is about sorting numbers in an array. I want to write a program that will print out the largest number in an array. I have seen lots of threads about qsort but I'm confused as to how to use it. I have tried writing something like this.

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

float data[10];

main()
{
data[0]=8.0;
data[1]=7.4;
data[2]=8.6;
data[3]=6.4;
data[4]=20.0;
data[5]=3.4;
data[6]=2.3;
data[7]=13.5;
data[8]=7.7;
data[9]=9.2;

qsort(data, 10, sizeof(float), )
/* I think I need a pointer to a function there, but I don't understand how to use those */

If anybody can help me with this I would be very gratefull. Thanks in advance.

Andrew

 

[ankan]

Hi

Here's what you need:

The comparing function declaration ...
int compare(const void *, const void *);

The call to qsort ...
qsort((void *)data, 10, sizeof(data[0]), compare);

The comparing function ...
int compare(const void *a, const void *b)
{
float x, y;
x = *(float *)a;
y = *(float *)b;
if(x == y) return 0;
else return (x<y)? -1: 1; /* stores in ascending order */
/* return (x>y)? -1: 1; stores in descending order */
}

But if you just want to print the largest why not...
[ignore]max = data[0];
for(i=0; i<10; i++)
max = (max<data)? data: max;
[/ignore]
Hope it helps.

Bye.
Ankan.

Now, could you please help me... Thread205-112554 Please do correct me if I am wrong.