ccc

[zionet]

ccc

[a k n]

The template argument needs to be a compile time constant, whereas in this case, b is a variable.
Why not just set the size to be sizeof(int)*CHAR_BIT ?

[a k n]

Try this:

#include <iostream>
#include <bitset>
#include <climits>
using namespace std;

int main()
{
    int x = 12;
    cout << bitset<sizeof(int)*CHAR_BIT> (x);
}

EDIT: If you want to remove the preceding zeroes, you could use a stringstream to convert a bitset to a string, then use find the first 1 and truncate the string with substr

[zionet]

b read for keyboard but no run. What is the code

[a k n]

Try the code above, it works without any input

[zionet]

Read B whit CIN

[zionet]

Dead integer for define number bits whit use CIN

[zionet]

I require read input , the number of bits to use ...

[shadder]

@zionet

Please re-edit your post and let other see it in future....

there will be other people in future who will someday find similar problem and could get help from your post

[shacktar]

Original Topic Title: "Convert INT to BINARY with BITSET ERROR"

OP:

What is problem no read <b> b is a bits number

#include <iostream>
#include <bitset>
using namespace std;

int main()
{
int b,x = 12;
cin>>b;
cout<< bitset<b> (x);
}

[shadder]

wow! did you remember all that stuff???

[48T7M4Gy]

http://www.cplusplus.com/forum/beginner/193018/

[shadder]

ooh!