Can someone explain the misbehaviour of this code

[jinnejeevansai]

I was trying to solve a problem then i observed a misbehaviour in my code,it is asking for input continuosly how much input i give and this is only happening for some particular inputs.

#include<stdio.h>
  void fun(int a[],int n,int k)
    {
        int i,j,t;
        int b[1000];
         for(i=0;i<n;i++)
        {
            b[i]=1;
            while(a[i]!=1&&a[i]!=0)
            {
                if(a[i]%2==1)
                b[i]++;
                a[i]=a[i]/2;
            }
                     if(a[i]==0)
                     b[i]=0;
        }
        for(i=0;i<k;i++)
        {
            int max=i;
            for(j=i;j<n-1;j++)
            {
                if(b[j]>b[max])
                {
                    max=j;
                }
            }
            t=a[i];
            a[i]=a[max];
            a[max]=t;
            t=b[i];
            b[i]=b[max];
            b[max]=t;
        printf("%d",a[i]);
        }
    }
    int main()
    { 
        int t,n,k,i,j,a[1000];
        scanf("%d",&t);
        for(i=0;i<t;i++)
        {
            scanf("%d %d",&n,&k);
            for(j=0;j<n;j++)
            {
                 scanf("%d",&a[j]);
            }
            fun(a,n,k);
        }
    }        
 
 

[donbock]

I suggest you add code after lines 40 and 43 to test the entered values of t, n, and k to make sure they make sense.

What should happen if a[i] is negative? Should the tests on lines 9 and 11 also check for -1?