[英]print binary numbers in ascending order
I was trying to print binary numbers in ascending order of 0's (00 then 01, 10, 11). 我试图以0的升序打印二进制数字(00依次为01、10、11)。
Such that the zeros are before. 这样零之前。
I tried using the below code from here but this does not give the right op ( running sample ) 我从这里尝试使用下面的代码,但这不能给出正确的操作( 运行示例 )
void test2() {
final int grayCodeLength = 4;
// generate matrix
final int grayCodeCount = 1 << grayCodeLength; // = 2 ^ grayCodeLength
int grayCodeMatrix[][] = new int[grayCodeCount][grayCodeLength];
for (int i = 0; i < grayCodeCount; i++) {
int grayCode = (i >> 1) ^ i;
for (int j =0; j <grayCodeLength; j++) {
// extract bit
final int grayCodeBitMask = 1 << j;
grayCodeMatrix[i][j] = (grayCode & grayCodeBitMask) >> j;
}
}
// view result
for (int y = 0; y < grayCodeMatrix.length; y++) {
for (int x = 0; x < grayCodeMatrix[0].length; x++) {
System.out.print(grayCodeMatrix[y][x]);
}
System.out.print("\n");
}
}
but this op is not for ascending order of 0's. 但此操作不适用于0的升序。
So i had to do with strings in this code ( running sample ) 所以我不得不处理这段代码中的字符串( 运行示例 )
class Main
{
static int k = 4;
public static void main (String[] args) throws java.lang.Exception
{
new Main().test7(k, "");
}
void test7(int i, String a) {
a = a + "0";
if (a.length() == k) {
System.out.println(""+a);
a = a.substring(0, a.length()-1);
a =a +"1";
System.out.println(a);
}else {
test7(i-1, a);
if (a.length() >1) {
a =a.substring(0, a.length()-1);
a =a+"1";
} else {
a = "1";
}
test7(i-1,a);
}
}
}
any way out to optimize for this o/p using gray code. 任何使用格雷码对此o / p进行优化的方法。
As your intention is just print out binary number representation of numbers from 由于您的意图只是打印出以下数字的二进制数字表示形式
zero to 2^k-1
Here's the Biset
approach 这是
Biset
方法
public class BitTest {
public static void main(String args[]) {
int k = 4;
BitSet bits;
for(int x = 0;x< (1<<k) ;x++){
bits= new BitSet(k);
int i = 0;
int v=x;
while (v > 0) {
if ( (v % 2) == 1 )
bits.set(i);
v = v/2;
i++;
}
// print BitSet contents
for(i=k-1; i>=0; i--)
System.out.print(bits.get(i)? 1 : 0);
System.out.print("\n");
}
}
}
This Question was earlier tagged with C++ 此问题先前已用C ++标记
In C++, this will be even more straight forward: 在C ++中,这将更加直接:
#include <iostream>
#include <bitset>
#include <climits>
using namespace std;
int main()
{
const int k=4;
for(int i=0;i<1<<k;i++){
bitset<k> bits(i);
cout << bits << endl;
}
}
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