zoho taxi question (3rd Round)

INTERVIEW C QUESTION (ZOHO)

******************************************************************************

QUESTION

Write a program to sort the elements in odd positions in descending order and elements in ascending order

Eg 1: Input: 13,2 4,15,12,10,5
        Output: 13,2,12,10,5,15,4
Eg 2: Input: 1,2,3,4,5,6,7,8,9
        Output: 9,2,7,4,5,6,3,8,1 

*******************************************************************************/

PROGRAM

#include <stdio.h>
#include<string.h>
int main()
{
int a[100],b=0,i,j,temp;
while((scanf("%d ",&a[b]))>0)
{
    b++;
}
for(i=0;i<b;i=i+2)
{
    for(j=i+2;j<b;j=j+2)
    {
        if(a[j]>a[i])
        {
            temp=a[i];
            a[i]=a[j];
            a[j]=temp;
        }
    }
}
for(i=1;i<b;i=i+2)
{
    for(j=i+2;j<b;j=j+2)
    {
        if(a[j]<a[i])
        {
            temp=a[i];
            a[i]=a[j];
            a[j]=temp;
        }
    }
}
for(i=0;i<b;i++)
{
    printf("%d ",a[i]);
}

}