The key of C Major has no accidentals; therefore, its numeric value is 0.
（C大调没有变音记号，所以其值为零）
The key of D Major has two sharps; thus, its numeric value is 2.
（D大调有两个升号，其值为2）
The key of E Major has four sharps - a numeric value of 4.
（E大调有四个升号，其值为4）
The key of G Major has one sharp. Its numeric value is 1.
（G大调有一个升号，其值为1）
The key of A Major has three sharps - a numeric value of 3.
（A大调有三个升号，其值为3）
Finally, the key of B Major has five sharps - giving it a numeric value of 5.
（最后，B大调有5个升号，其值为5）
These seven values must be memorized before we can proceed.
（这七个值必须记住才能继续进行下面的计算）
Next, let's compare C-flat, C, and C-sharp Major.
（接下来比较一下降C大调，C大调，升C大调）
If we start at C Major and subtract 7, we end up at C-flat Major.
（从C大调开始减去7，就得到降C大调）
If we start at C Major and add 7, we end up at C-sharp Major.
（从C大调开始加上7，就得到升C大调）
To convert to E-flat Major, subtract 7.
（减去7即可转换为降E大调）
The result is -3; thus, E-flat Major has 3 flats.
（4-7=-3，所以降E大调有3个降号）
Let's try F-sharp Major. Start with F Major, which is -1.
（我们来试一下升F大调，从值为-1的F大调开始）
The result is 6; thus, F-sharp Major has 6 sharps.
（-1+7=6，所以升F大调有6个升号）
Next, we will examine minor scales. Compare C Major and C Minor.
（接下来我们来验证一下小调。比较一下C大调和C小调）
To convert a major scale into its parallel minor, simply subtract 3.
（要转换大调到它的小调去，只要减去3即可）
Let's calculate D Minor. We will start with D Major, which is 2.
（我们来计算一下D小调，从值为2的D大调开始）
The result is -1. Therefore, D Minor has one 1 flat.
（得到-1，所以，D小调有1个降号）
Next, let's try F Minor. We will start with F Major, which is -1.
（接下来我们试一下F小调，从值为-1的F大调开始）
The result is -4. Thus, F Minor has 4 flats.
（得到-4，所以，F小调有4个降号）
Start with C Major, which has a numeric value of 0.
（从值为0的C大调开始）
Finally, subtract 3 to convert to C-sharp Minor.
（最后减去3即可得出升C小调）
The result is 4. C-sharp Minor therefore has 4 sharps.
（7-3=4，所以，升C的小调有4个升号）
While these exist in theory; in practice, they would not be used.
（当然这只是理论性的，在实践中不会用）
Start with G Major, which has a numeric value of 1.
（从值为1的G大调开始）
Use this chart for reference to the key signature calculation method.
（这就是调号的计算方法）