二进制Denary转换器在Java中 [英] Binary to Denary Converter in Java

问题描述

努力使二进制转换器在Java中denary，但我不知道怎么回事错了，我有一种感觉，我的循环，任何帮助将是非常美联社preciated！我下面的伪code，如果你想看到它！

 的System.out.println（输入一个二进制数）;扫描仪SC =新的扫描仪（System.in）;
串binaryString = sc.next（）;INT binaryLength = binaryString.length（）;INT乘数= 1;
INT denaryValue = 0;对于（INT N = binaryLength; N＆GT; = 1; N  - ）{
    INT位= N;
    denaryValue = denaryValue +数字*乘数;
    乘数=乘数* 2;
}
的System.out.println（该denary等效为+ denaryValue）;
 

解决方案

绝对最简单的方法是用的Integer.parseInt（字符串，2）; （你的情况： 的Integer.parseInt（binaryString，2）; ）

不过，如果你真的想运行循环：

 的for（int N = binaryLength; N＆GT; = 1; N  - ）{
    INT位= binaryString.charAt（N  -  1） - '0';
    denaryValue = denaryValue +数字*乘数;
    乘数=乘数* 2;
}
 

就个人而言，我会做到这一点，如果我真的想重新发明轮子：

 如果（！binaryString.matches（[01] +））{
    //这里我们知道，有一个人物不是0或1
    //或者字符串为空
}
对于（字符C：binaryString.toCharArray（））{
    denaryValue + = C  - '0';
    denaryValue＆所述;＆下; = 1; //二进制左移;乘以2
}
denaryValue＆GT;＆GT; = 1; //二进制右移;除以2
 

trying to make a converter of binary to denary in java, but I'm not sure whats going wrong, I have a feeling its in my loop, any help would be much appreciated! I am following pseudo code if you would like to see it!

System.out.println("Enter a binary number");

Scanner sc = new Scanner(System.in);
String binaryString = sc.next();

int binaryLength = binaryString.length();

int multiplier = 1;
int denaryValue = 0; 

for(int n = binaryLength; n >= 1; n--){
    int digit = n;
    denaryValue = denaryValue + digit * multiplier;
    multiplier = multiplier * 2;
}
System.out.println("The denary equivalent is " + denaryValue);

解决方案

The absolute easiest way is with Integer.parseInt(String, 2); (in your case: Integer.parseInt(binaryString, 2);).

However, if you really want to run the loop:

for(int n = binaryLength; n >= 1; n--){
    int digit = binaryString.charAt(n - 1) - '0';
    denaryValue = denaryValue + digit * multiplier;
    multiplier = multiplier * 2;
}

Personally, I'd do this if I really wanted to reinvent the wheel:

if (!binaryString.matches("[01]+")) {
    //here we know that there is a character that is not a 0 or a 1
    //or that the string is empty
}
for(char c : binaryString.toCharArray()) {
    denaryValue += c - '0';
    denaryValue <<= 1; //binary left shift; multiply by 2
}
denaryValue >>= 1; //binary right shift; divide by 2

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