can we assign value 0 in index x in array

Question

I am trying to assign 0 at x place in array but if I write a[x]=0; then, it will take the value 0 at every index and I want to give 0 at only x th index( since x is Dynamics), if you know how to write it, please let me know

Answer 1

array[x] = 0; should only assign zero to the element having <x> as index, except you use <x> in a loop counter. But what did you mean by "x is dynamic"?

I suggest to share your code link in Description to be clear 👍

Answer 2

https://code.sololearn.com/cYJ3GJk2TUBc/?ref=app

Answer 3

#include <iostream>
#include<cmath>
using namespace std;
int main()
{ int s;
cin>>s;
while(s>0)
{ int temp,n,l,x,t,d,p,i,y;
cin>>n;
p =ceil(log2(n+1));
x=p;
if(p=1){
x=p+1;}
else if (p%2!=0){
x=p+1;}
bool arr[x];
bool ar[x];
temp=n,i=0;
while(temp>1)
{arr[i]=temp%2;
temp=temp/2;
i++;
}
arr[i]=1;
if(p%2!=0)
ar[p+1]=0;
for(l=0;l<=x;l=l+2)
{
t=arr[l];
ar[l]=arr[l+1];
ar[l+1]=t;
}
for(d=0;d<=x;d++)
{
y=y+(pow(2,d)*ar[d]);
}
cout<<y<<endl;
y=0;
s--;
}return 0;
}

Answer 4

I posted a picture of elaborated question, can you please check that

Answer 5

vishal shivhare
Check the code again bro, and see if this is really what you meant to do, it looks odd to me ...

if (p = 1)// p == 1?
{
x = p + 1;
}

Answer 6

Ya bro that is the mistake, thanks for that, but the question I asked remains same ?

Answer 7

Bro arr is storing the bits but in reverse order

Answer 8

Yeah bro, I see that. It seems to be the problem. Because that way, the bits to be swapped are from wrong index.

And the way a number is formed by the lines

for (d = 0; d <= x; d++)
{
y = y + (pow(2, d) * ar[d]);
}

Starts from 0th bit, while actually it was not the 0th bit in the number.

Answer 9

This is the code to swipe the bits of no. Then print the no.( Of changed bits)

Answer 10

Swipe the bits? can you elaborate on that please? this is first time I hear bit swiping. An example might help to understand better 👌

Answer 11

Can you tell me in which part of the code the problem is bro?
I am checking the code, but I see the <arr> isn't storing the bits as they should be. I think this is where the problem begins. You should check whether the bits in <arr> are correct. After this is good we can move on to swapping the bits 👍