查找字符是元音还是辅音的程序

给定一个字符，检查它是元音还是辅音。元音是“a”、“e”、“i”、“o”和“u”。所有其他字符（'b'、'c'、'd'、'f' ....）都是辅音。

例子：

Input : x = 'c'
Output : Consonant

Input : x = 'u'
Output : Vowel

我们检查给定字符是否匹配 5 个元音中的任何一个。如果是，我们打印“元音”，否则我们打印“辅音”。

C++

// CPP program to check if a given character
// is vowel or consonant.
#include 
using namespace std;
 
// Function to check whether a character is
// vowel or not
void vowelOrConsonant(char x)
{
    if (x == 'a' || x == 'e' || x == 'i' ||
                   x == 'o' || x == 'u')
        cout << "Vowel" << endl;
    else
        cout << "Consonant" << endl
}
 
// Driver code
int main()
{
    vowelOrConsonant('c');
    vowelOrConsonant('e');
    return 0;
}

Java

// java program to check if a given
// character is vowel or consonant.
import java.io.*;
 
public class GFG {
 
    // Function to check whether a
    // character is vowel or not
    static void vowelOrConsonant(char x)
    {
        if (x == 'a' || x == 'e' || x == 'i' ||
                          x == 'o' || x == 'u')
            System.out.println("Vowel");
        else
            System.out.println("Consonant");
    }
 
    // Driver code
    static public void main(String[] args)
    {
        vowelOrConsonant('c');
        vowelOrConsonant('e');
    }
}
 
// This code is contributed by vt_m.

Python3

# Python3 program to check if a given
# character is vowel or consonant.
 
# Function to check whether a character
# is vowel or not
def vowelOrConsonant(x):
 
    if (x == 'a' or x == 'e' or
        x == 'i' or x == 'o' or x == 'u'):
        print("Vowel")
    else:
        print("Consonant")
 
# Driver code
vowelOrConsonant('c')
vowelOrConsonant('e')
     
# This code is contributed by
# mohit kumar 29

C#

// C# program to check if a given
// character is vowel or consonant.
using System;
 
public class GFG {
 
    // Function to check whether a
    // character is vowel or not
    static void vowelOrConsonant(char x)
    {
        if (x == 'a' || x == 'e' || x == 'i' ||
                          x == 'o' || x == 'u')
            Console.WriteLine("Vowel");
        else
            Console.WriteLine("Consonant");
    }
 
    // Driver code
    static public void Main()
    {
        vowelOrConsonant('c');
        vowelOrConsonant('e');
    }
}
 
// This code is contributed by vt_m.

Javascript

    // Javascript program to check if a given
    // character is vowel or consonant.
     
    // Function to check whether a
    // character is vowel or not
    function vowelOrConsonant(x)
    {
        if (x == 'a' || x == 'e' || x == 'i' || x == 'o' || x == 'u')
            document.write("Vowel" + "</br>");
        else
            document.write("Consonant" + "</br>");
    }
       
    vowelOrConsonant('c');
      vowelOrConsonant('e');
     
    // This code is contributed by mukesh07.

输出：

Consonant
Vowel

时间复杂度： O(1)

辅助空间： O(1)

如何处理大写字母？

C++

// C++ program to check if a given character
// is vowel or consonant.
#include 
using namespace std;
 
// Function to check whether a character is
// vowel or not
void vowelOrConsonant(char x)
{
    if (x == 'a' || x == 'e' || x == 'i' ||
        x == 'o' || x == 'u' || x == 'A' ||
        x == 'E' || x == 'I' || x == 'O' || x == 'U')
        cout << "Vowel" << endl;
    else
        cout << "Consonant" << endl;
}
 
// Driver code
int main()
{
    vowelOrConsonant('c');
    vowelOrConsonant('E');
    return 0;
}

Java

// Java program to check if a given
// character is vowel or consonant
import java.io.*;
 
public class GFG {
 
    // Function to check whether a
    // character is vowel or not
    static void vowelOrConsonant(char x)
    {
        if (x == 'a' || x == 'e' || x == 'i' ||
            x == 'o' || x == 'u' || x == 'A' ||
            x == 'E' || x == 'I' || x == 'O' || x == 'U')
            System.out.println("Vowel");
        else
            System.out.println("Consonant");
    }
 
    // Driver code
    static public void main(String[] args)
    {
        vowelOrConsonant('c');
        vowelOrConsonant('E');
    }
}
 
// This article is contributed by vt_m.

Python3

# Python3 program to check if a given
# character is vowel or consonant.
 
# Function to check whether a
# character is vowel or not
def vowelOrConsonant(x):
    if (x == 'a' or x == 'e' or x == 'i' or
        x == 'o' or x == 'u' or x == 'A' or
        x == 'E' or x == 'I' or x == 'O' or
        x == 'U'):
        print("Vowel")
    else:
        print("Consonant")
 
# Driver code
if __name__ == '__main__':
    vowelOrConsonant('c')
    vowelOrConsonant('E')
 
# This code is contributed by
# Sanjit_Prasad

C＃

// C# program to check if a given
// character is vowel or consonant
using System;
public class GFG {
 
    // Function to check whether a
    // character is vowel or not
    static void vowelOrConsonant(char x)
    {
        if (x == 'a' || x == 'e' || x == 'i' ||
            x == 'o' || x == 'u' || x == 'A' ||
            x == 'E' || x == 'I' || x == 'O' || x == 'U')
            Console.WriteLine("Vowel");
        else
            Console.WriteLine("Consonant");
    }
 
    // Driver code
    static public void Main()
    {
        vowelOrConsonant('c');
        vowelOrConsonant('E');
    }
}
 
// This article is contributed by vt_m.

Javascript

 
// Javascript program to check if a
// given character is vowel or consonant.
 
// Function to check whether a character is
// vowel or not
function vowelOrConsonant(x)
{
    if (x == 'a' || x == 'e' || x == 'i' ||
        x == 'o' || x == 'u' || x == 'A' ||
        x == 'E' || x == 'I' || x == 'O' || x == 'U')
        document.write("Vowel" + "</br>");
    else
        document.write("Consonant" + "</br>");
}
 
// Driver code
vowelOrConsonant('c');
vowelOrConsonant('E');
 
// This code is contributed by rameshtravel07
 

输出：

Consonant
Vowel

时间复杂度： O(1)

辅助空间： O(1)

使用开关盒

C++

#include 
 
using namespace std;
 
int isVowel(char ch)
{
    int check = 0;
    switch (ch) {
    case 'a':
    case 'e':
    case 'i':
    case 'o':
    case 'u':
    case 'A':
    case 'E':
    case 'I':
    case 'O':
    case 'U':
        check = 1;
    }
    return check;
}
 
// Driver Code
int main()
{
    cout << "a is " << isVowel('a')
         << endl; // 1 means Vowel
    cout << "x is " << isVowel('x')
         << endl; // 0 means Consonant
 
    return 0;
}

C

#include 
 
int isVowel(char ch)
{
    int check = 0;
    switch (ch) {
    case 'a':
    case 'e':
    case 'i':
    case 'o':
    case 'u':
    case 'A':
    case 'E':
    case 'I':
    case 'O':
    case 'U':
        check = 1;
    }
    return check;
}
 
int main()
{
    printf("a is %d\n",
           isVowel('a')); // 1 means Vowel
    printf("x is %d\n",
           isVowel('x')); // 0 means Consonant
 
    return 0;
}

Java

/*package whatever //do not write package name here */
 
import java.io.*;
 
class GFG {
    static int isVowel(char ch)
    {
        int check = 0;
        switch (ch) {
        case 'a':
        case 'e':
        case 'i':
        case 'o':
        case 'u':
        case 'A':
        case 'E':
        case 'I':
        case 'O':
        case 'U':
            check = 1;
        }
        return check;
    }
   
    // Driver Code
    public static void main(String[] args)
    {
 
        System.out.println("a is " + isVowel('a'));
        System.out.println("x is " + isVowel('x'));
    }
}

Python3

def isVowel(ch):
    switcher = {
        'a': "Vowel",
        'e': "Vowel",
        'i': "Vowel",
        'o': "Vowel",
        'u': "Vowel",
        'A': "Vowel",
        'E': "Vowel",
        'I': "Vowel",
        'O': "Vowel",
        'U': "Vowel"
    }
    return switcher.get(ch, "Consonant")
 
# Driver Code
print('a is '+isVowel('a'))
print('x is '+isVowel('x'))

C＃

using System;
 
class GFG
{
  static int isVowel(char ch)
  {
    int check = 0;
    switch (ch) {
      case 'a':
        check = 1;
        break;
      case 'e':
        check = 1;
        break;
      case 'i':
        check = 1;
        break;
      case 'o':
        check = 1;
        break;
      case 'u':
        check = 1;
        break;
      case 'A':
        check = 1;
        break;
      case 'E':
        check = 1;
        break;
      case 'I':
        check = 1;
        break;
      case 'O':
        check = 1;
        break;
      case 'U':
        check = 1;
        break;
    }
    return check;
  }
 
  // Driver code
  static public void Main ()
  {
    Console.WriteLine("a is " + isVowel('a'));
    Console.WriteLine("x is " + isVowel('x'));
  }
}
 
// This code is contributed by rag2127

Javascript

 
function isVowel(ch)
{
    var check = 0;
    switch (ch) {
    case 'a':
    case 'e':
    case 'i':
    case 'o':
    case 'u':
    case 'A':
    case 'E':
    case 'I':
    case 'O':
    case 'U':
        check = 1;
    }
    return check;
}
 
// Driver Code
 
// 1 means Vowel
document.write("a is " + isVowel('a') + "<br>");
 
// 0 means Consonant
document.write("x is " + isVowel('x') + "<br>");
 
// This code is contributed by Shivani
 

输出

a is 1
x is 0

时间复杂度： O(1)

辅助空间： O(1)

另一种方法是 find()字符中仅包含元音的字符串。

C++

#include 
#include 
 
using namespace std;
 
int isVowel(char ch)
{
    // Make the list of vowels
    string str = "aeiouAEIOU";
    return (str.find(ch) != string::npos);
}
 
// Driver code
int main()
{
    cout << "a is " << isVowel('a') << endl;
    cout << "x is " << isVowel('x') << endl;
 
    return 0;
}

C

#include 
#include 
 
int isVowel(char ch)
{
    // Make the list of vowels
    char str[] = "aeiouAEIOU";
    return (strchr(str, ch) != NULL);
}
 
// Driver Code
int main()
{
    printf("a is %d\n", isVowel('a'));
    printf("x is %d\n", isVowel('x'));
    return 0;
}

Java

/*package whatever //do not write package name here */
 
import java.io.*;
 
class GFG {
    static int isVowel(char ch)
    {
        // Make the list of vowels
        String str = "aeiouAEIOU";
        return (str.indexOf(ch) != -1) ? 1 : 0;
    }
   
    // Driver Code
    public static void main(String[] args)
    {
        System.out.println("a is " + isVowel('a'));
        System.out.println("x is " + isVowel('x'));
    }
}

Python3

def isVowel(ch):
 
    # Make the list of vowels
    str = "aeiouAEIOU"
    return (str.find(ch) != -1)
 
# Driver Code
print('a is '+str(isVowel('a')))
print('x is '+str(isVowel('x')))

C＃

// C# program to implement
// the above approach
using System;
class GFG{
     
static int isVowel(char ch)
{
  // Make the list of vowels
  string str = "aeiouAEIOU";
  return (str.IndexOf(ch) != -1) ?
          1 : 0;
}
  
// Driver code 
static void Main()
{
  Console.WriteLine("a is " + isVowel('a'));
  Console.WriteLine("x is " + isVowel('x'));
}
}
 
// This code is contributed by divyeshrabadiya07

Javascript

/*package whatever //do not write package name here */
     
    function isVowel(ch)
    {
        // Make the list of vowels
        let str = "aeiouAEIOU";
        return (str.indexOf(ch) != -1) ? 1 : 0;
    }
     
    // Driver Code
    document.write("a is " + isVowel('a')+"<br>");
    document.write("x is " + isVowel('x')+"<br>");
     
 
// This code is contributed by patel2127

输出

a is 1
x is 0

时间复杂度： O(N)

辅助空间： O(1)
使用位移检查元音的最有效方法：

在 ASCII 中，这些是每个元音在小写和大写中的各自值。

Vowel	DEC	HEX	BINARY
a	97	0x61	01100001
e	101	0x65	01100101
i	105	0x69	01101001
o	111	0x6F	01101111
u	117	0x75	01110101
A	65	0x41	01000001
E	69	0x45	01000101
I	73	0x49	01001001
O	79	0x4F	01001111
U	85	0x55	01010101

因为非常小写和大写的元音具有相同的 5 个 LSB。我们需要一个数字 0x208222，它在右移 1、5、19、15 后的 LSB 中给出 1，否则给出 0。数字取决于字符编码。

DEC	HEX	BINARY
31	0x1F	00011111
2130466	0x208222	1000001000001000100010

C++

#include 
using namespace std;
 
int isVowel(char ch)
{
    return (0x208222 >> (ch & 0x1f)) & 1;
    // same as (2130466 >> (ch & 31)) & 1;
}
 
// Driver Code
int main()
{
    cout << "a is " << isVowel('a') << endl;
    cout << "x is " << isVowel('x') << endl;
 
    return 0;
}

C

#include 
 
int isVowel(char ch)
{
    return (0x208222 >> (ch & 0x1f)) & 1;
    // same as (2130466 >> (ch & 31)) & 1;
}
 
// Driver Code
int main()
{
    printf("a is %d\n", isVowel('a'));
    printf("x is %d\n", isVowel('x'));
 
    return 0;
}

Java

/*package whatever //do not write package name here */
 
import java.io.*;
 
class GFG
{
    static int isVowel(char ch)
    {
        return (0x208222 >> (ch & 0x1f)) & 1;
        // same as (2130466 >> (ch & 31)) & 1;
    }
   
    // Driver Code
    public static void main(String[] args)
    {
        System.out.println("a is " + isVowel('a'));
        System.out.println("x is " + isVowel('x'));
    }
}

Python3

def isVowel(ch):
 
    return (0x208222 >> (ord(ch) & 0x1f)) & 1
    # same as (2130466 >> (ord(ch) & 31)) & 1;
 
# Driver Code
print('a is '+str(isVowel('a')))
print('x is '+str(isVowel('x')))

C＃

// C# implementation of above approach
using System;
class GFG {
     
    static int isVowel(char ch)
    {
        return (0x208222 >> (ch & 0x1f)) & 1;
         
      // same as (2130466 >> (ch & 31)) & 1;
    }
    
  // Driver code
  static void Main()
  {
    Console.WriteLine("a is " + isVowel('a'));
    Console.WriteLine("x is " + isVowel('x'));
  }
}
 
// This code is contributed by divesh072019

Javascript

 
    function isVowel(ch)
    {
        return (0x208222 >> (ch.charCodeAt(0) & 0x1f)) & 1;
        // same as (2130466 >> (ch & 31)) & 1;
    }
     
    // Driver Code
    document.write("a is " + isVowel('a')+"<br>");
    document.write("x is " + isVowel('x')+"<br>");
     
 
// This code is contributed by unknown2108

输出

a is 1
x is 0

时间复杂度： O(1)

辅助空间： O(1)
*我们可以在 X86 机器上省略 ( ch & 0x1f ) 部分，因为 SHR/SAR (即 >> ) 自动掩码为 0x1f。

*对于机器来说，位图检查比表格检查快，但如果 ch 变量存储在寄存器中，它可能会执行得更快。