How would you write qsort?
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Answer / hardik
#include<stdio.h>
#include<conio.h>
void sort(int,int);
int *arr;
void main()
{
clrscr();
int n,ub,lb=0,i;
printf("ENTER NO OF VALUES U WANT TO ENTER : ");
scanf("%d",&ub);
for(i=0;i<ub;i++)
{
printf("\ENter value : ");
scanf("%d",&arr[i]);
}
sort(lb,ub);
for(i=0;i<ub;i++)
printf("%d\t",arr[i]);
getch();
}
void sort(int lb,int ub)
{
int flag=1,temp,key,i,j;
i=lb; j=ub;
key=arr[i];
if(lb<ub)
{
while(flag)
{
i++;
while(key>arr[i])
i++;
while(key<arr[j])
j--;
if(i<j)
{
temp=arr[i];
arr[i]=arr[j];
arr[j]=temp;
}
else
flag=0;
}
temp=arr[lb];
arr[lb]=arr[j];
arr[j]=temp;
sort(lb,j-1);
sort(j+1,ub);
}
}
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