ASCII编码表 以及怎么获取ASCII码 #Java #Python #C++ #JavaScript

其中最常用：

0 - 9 : 48~57

A - Z ：65~90

a - z : 97~122

java中如何获取字符的ASCII码

---

java中使用Integer.valueOf(char c)方法可以直接获取一个字符的ASCII码，比如：

public class ASCIITest {
    public static void main(String[] args) {
        char a='a';
        char A='A';
        int a_ascii=Integer.valueOf(a);
        int A_ascii=Integer.valueOf(A);
        System.out.println("字符"+a+"的ASCII码为："+a_ascii);
        System.out.println("字符"+A+"的ASCII码为："+A_ascii);
        System.out.println(A-2);
        System.out.println(A_ascii-a_ascii);
    }
}

 C++中如何获取字符的ASCII码

---

c++和java类似

#include 
#include 
using namespace std;
int main()
{
    
    char ch1 = 'a';
    char ch2 = 'A';
    
    cout << int(ch1) << endl;    //将字符强转成整形数，也就是我们能看懂的十进制数
    cout << int(ch2) << endl;
    
    return 0;
}

python中如何获取字符的ASCII码 

---

# python program to print ASCII
# value of a given character
 
# Assigning character to a variable
char_var = 'A'
# printing ASCII code
print("ASCII value of " + char_var + " is = ", ord(char_var))
 
char_var = 'x'
# printing ASCII code
print("ASCII value of " + char_var + " is = ", ord(char_var))
 
char_var = '9'
# printing ASCII code
print("ASCII value of " + char_var + " is = ", ord(char_var))

Javascript中如何获取字符的ASCII码 

---

var s = 'A';
console.log(s.charCodeAt(0));
// 65
console.log(String.fromCharCode(65));
// 'A'
'apple'.split('').forEach(function (c) {
  console.log(c + ': ' + c.charCodeAt(0));
});