程序功能,它先将键盘上输入的一个字符串转换成十进制整数,然后打印出这个十进制整数对应的二进制形式。
mport java.io.IOException;
public class TenToTwo
{
public static void main(String[] args) throws Exception
{
System.out.print("Please input int number:");
String s = readString();
while(isNumString(s) == 0 || isNumString(s)==-1)
{
if(isNumString(s) == 0)
{
System.out.print("You input isn't integer,please input again: ");
s = readString();
}
else
{
System.out.print("You input number is too lang,please input again: ");
s = readString();
}
}
Integer ten = new Integer(s.trim());
System.out.print(ten + " Two code is: ");
toTwo(ten.doubleValue());
System.out.println();
}
static void toTwo(double num)
{
int LEN = 16;
//int len=0;
if(num > 65535||(0-num) > 65535)
{
LEN=32;
}
Integer two[] = new Integer[LEN];
for(int i = 0;i<LEN;i++)
{
two[i] = new Integer(0);
}
int len = 0;
if(num < 0)
{
two[0] = new Integer(1);
num = 0-num;
} do
{
two[LEN-1-len] = new Integer(((int)num)%2);
len++;
num = (int)num/2;
}
while(num > 0);
for(int i = 0;i < LEN;i++)
{
System.out.print(i);
System.out.print(two[i]);
if((i + 1)%8==0)
{
System.out.print(" ");
}
}
}
static String readString() throws Exception
{
StringBuffer sb = new StringBuffer();
char ch = ' ';
while((ch = (char)(System.in.read()))!='\r')
{
sb.append(ch);
}
System.out.println(sb.toString().trim());
return sb.toString().trim();
}
static int isNumString(String s)
{
int rt = 1;
int len = s.length();
char[] c = new char[len];
c = s.toCharArray();
if((c[0] == '-'&&len-1 > 9)||len > 9)
{
rt = -1;
}
else
{
for(int i = 1;i < len;i++)
{
if(c[i]-'0' > 9)
{
rt = 0;
}
else
{
rt = 1;
}
}
}
return rt;
}
}
mport java.io.IOException;
public class TenToTwo
{
public static void main(String[] args) throws Exception
{
System.out.print("Please input int number:");
String s = readString();
while(isNumString(s) == 0 || isNumString(s)==-1)
{
if(isNumString(s) == 0)
{
System.out.print("You input isn't integer,please input again: ");
s = readString();
}
else
{
System.out.print("You input number is too lang,please input again: ");
s = readString();
}
}
Integer ten = new Integer(s.trim());
System.out.print(ten + " Two code is: ");
toTwo(ten.doubleValue());
System.out.println();
}
static void toTwo(double num)
{
int LEN = 16;
//int len=0;
if(num > 65535||(0-num) > 65535)
{
LEN=32;
}
Integer two[] = new Integer[LEN];
for(int i = 0;i<LEN;i++)
{
two[i] = new Integer(0);
}
int len = 0;
if(num < 0)
{
two[0] = new Integer(1);
num = 0-num;
} do
{
two[LEN-1-len] = new Integer(((int)num)%2);
len++;
num = (int)num/2;
}
while(num > 0);
for(int i = 0;i < LEN;i++)
{
System.out.print(i);
System.out.print(two[i]);
if((i + 1)%8==0)
{
System.out.print(" ");
}
}
}
static String readString() throws Exception
{
StringBuffer sb = new StringBuffer();
char ch = ' ';
while((ch = (char)(System.in.read()))!='\r')
{
sb.append(ch);
}
System.out.println(sb.toString().trim());
return sb.toString().trim();
}
static int isNumString(String s)
{
int rt = 1;
int len = s.length();
char[] c = new char[len];
c = s.toCharArray();
if((c[0] == '-'&&len-1 > 9)||len > 9)
{
rt = -1;
}
else
{
for(int i = 1;i < len;i++)
{
if(c[i]-'0' > 9)
{
rt = 0;
}
else
{
rt = 1;
}
}
}
return rt;
}
}
Integer.toBinaryString()
就可以直接转换了
public class TenToTwo
{
public static void main(String[] args) throws Exception
{
System.out.print("Please input int number:");
String s = readString();
while(isNumString(s) == 0 || isNumString(s)==-1)
{
if(isNumString(s) == 0)
{
System.out.print("You input isn't integer,please input again: ");
s = readString();
}
else
{
System.out.print("You input number is too lang,please input again: ");
s = readString();
}
}
Integer ten = new Integer(s.trim());
System.out.print(ten + " Two code is: ");
toTwo(ten.doubleValue());
System.out.println();}
static void toTwo(double num)
{
int LEN = 16;
//int len=0;
if(num > 65535||(0-num) > 65535)
{
LEN=32;
}
Integer two[] = new Integer[LEN];for(int i = 0;i<LEN;i++)
{
two[i] = new Integer(0);
}
int len = 0;
if(num < 0)
{
two[0] = new Integer(1);
num = 0-num;
}do
{
two[LEN-1-len] = new Integer(((int)num)%2);
len++;
num = (int)num/2;
}
while(num > 0);
for(int i = 0;i < LEN;i++)
{
System.out.print(i);
System.out.print(two[i]);
if((i + 1)%8==0)
{
System.out.print(" ");
}
}
}
static String readString() throws Exception
{
StringBuffer sb = new StringBuffer();
char ch = ' ';
while((ch = (char)(System.in.read()))!='\r')
{
sb.append(ch);
}
System.out.println(sb.toString().trim());
return sb.toString().trim();
} static int isNumString(String s)
{
int rt = 1;
int len = s.length();
char[] c = new char[len];
c = s.toCharArray();
if((c[0] == '-'&&len-1 > 9)||len > 9)
{
rt = -1;
}
else
{
for(int i = 1;i < len;i++)
{
if(c[i]-'0' > 9)
{
rt = 0;
}
else
{
rt = 1;
}
}
}
return rt;
}
}
public class TenToTwo
{
public static void main(String[] args) throws Exception
{
System.out.print("Please input int number:");
String s = readString();
while(isNumString(s) == 0 || isNumString(s)==-1)
{
if(isNumString(s) == 0)
{
System.out.print("You input isn't integer,please input again: ");
s = readString();
}
else
{
System.out.print("You input number is too lang,please input again: ");
s = readString();
}
}
Integer ten = new Integer(s.trim());
System.out.print(ten + " Two code is: ");
toTwo(ten.doubleValue());
System.out.println();}
static void toTwo(double num)
{
int LEN = 16;
//int len=0;
if(num > 65535||(0-num) > 65535)
{
LEN=32;
}
Integer two[] = new Integer[LEN];for(int i = 0;i<LEN;i++)
{
two[i] = new Integer(0);
}
int len = 0;
if(num < 0)
{
two[0] = new Integer(1);
num = 0-num;
}do
{
two[LEN-1-len] = new Integer(((int)num)%2);
len++;
num = (int)num/2;
}
while(num > 0);
for(int i = 0;i < LEN;i++)
{
System.out.print(i);
System.out.print(two[i]);
if((i + 1)%8==0)
{
System.out.print(" ");
}
}
}
static String readString() throws Exception
{
StringBuffer sb = new StringBuffer();
char ch = ' ';
while((ch = (char)(System.in.read()))!='\r')
{
sb.append(ch);
}
System.out.println(sb.toString().trim());
return sb.toString().trim();
} static int isNumString(String s)
{
int rt = 1;
int len = s.length();
char[] c = new char[len];
c = s.toCharArray();
if((c[0] == '-'&&len-1 > 9)||len > 9)
{
rt = -1;
}
else
{
for(int i = 1;i < len;i++)
{
if(c[i]-'0' > 9)
{
rt = 0;
}
else
{
rt = 1;
}
}
}
return rt;
}
}
import java.io.IOException;
public class TenToTwo
{
public static void main(String[] args) throws Exception
{
System.out.print("Please input int number:");
String s = readString();
while(isNumString(s) == 0 || isNumString(s)==-1)
{
if(isNumString(s) == 0)
{
System.out.print("You input isn't integer,please input again: ");
s = readString();
}
else
{
System.out.print("You input number is too lang,please input again: ");
s = readString();
}
}
Integer ten = new Integer(s.trim());
System.out.print(ten + " Two code is: ");
toTwo(ten.doubleValue());
System.out.println();}
static void toTwo(double num)
{
int LEN = 16;
//int len=0;
if(num > 65535||(0-num) > 65535)
{
LEN=32;
}
Integer two[] = new Integer[LEN];for(int i = 0;i<LEN;i++)
{
two[i] = new Integer(0);
}
int len = 0;
if(num < 0)
{
two[0] = new Integer(1);
num = 0-num;
}do
{
two[LEN-1-len] = new Integer(((int)num)%2);
len++;
num = (int)num/2;
}
while(num > 0);
for(int i = 0;i < LEN;i++)
{
System.out.print(i);
System.out.print(two[i]);
if((i + 1)%8==0)
{
System.out.print(" ");
}
}
}
static String readString() throws Exception
{
StringBuffer sb = new StringBuffer();
char ch = ' ';
while((ch = (char)(System.in.read()))!='\r')
{
sb.append(ch);
}
System.out.println(sb.toString().trim());
return sb.toString().trim();
} static int isNumString(String s)
{
int rt = 1;
int len = s.length();
char[] c = new char[len];
c = s.toCharArray();
if((c[0] == '-'&&len-1 > 9)||len > 9)
{
rt = -1;
}
else
{
for(int i = 1;i < len;i++)
{
if(c[i]-'0' > 9)
{
rt = 0;
}
else
{
rt = 1;
}
}
}
return rt;
}
}
Integer.toBinaryString(int)
就可以直接转换了
{
/* 把这一行注释掉 */
//System.out.print(i);//你要print i干吗?!
System.out.print(two[i]);
if((i + 1)%8==0)
{
System.out.print(" ");
}
}