打印字符串的中间字符

给定字符串str ，任务是打印字符串的中间字符。如果字符串的长度是偶数，那么中间会有两个字符，我们需要打印第二个中间字符。

例子：

Input: str = “Java”
Output: v
Explanation: 
The length of the given string is even. 
Therefore, there would be two middle characters ‘a’ and ‘v’, we print the second middle character.

Input: str = “GeeksForGeeks”
Output: o
Explanation: 
The length of the given string is odd. 
Therefore, there would be only one middle character, we print that middle character.

方法：

1. 获取要找到中间字符的字符串。
2. 计算给定字符串的长度。
3. 查找字符串的中间索引。
4. 现在，在Java中使用函数charAt() 在索引中间打印字符串的中间字符。

下面是上述方法的实现：

C++

// C++ program to implement
// the above approach
#include
using namespace std;
 
// Function that prints the middle
// character of a string
void  printMiddleCharacter(string str)
{
    // Finding string length
    int len = str.size();
 
    // Finding middle index of string
    int middle = len / 2;
 
    // Print the middle character
    // of the string
    cout << str[middle];
}
 
// Driver Code
int main()
{
    // Given string str
    string str = "GeeksForGeeks";
 
    // Function Call
    printMiddleCharacter(str);
    return 0;
}
 
// This code is contributed by Sapnasingh

Java

// Java program for the above approach
class GFG {
 
    // Function that prints the middle
    // character of a string
    public static void
    printMiddleCharacter(String str)
    {
        // Finding string length
        int len = str.length();
 
        // Finding middle index of string
        int middle = len / 2;
 
        // Print the middle character
        // of the string
        System.out.println(str.charAt(middle));
    }
 
    // Driver Code
    public static void
    main(String args[])
    {
        // Given string str
        String str = "GeeksForGeeks";
 
        // Function Call
        printMiddleCharacter(str);
    }
}

Python3

# Python3 program for the above approach
 
# Function that prints the middle
# character of a string
def printMiddleCharacter(str):
     
    # Finding string length
    length = len(str);
 
    # Finding middle index of string
    middle = length // 2;
 
    # Prthe middle character
    # of the string
    print(str[middle]);
 
# Driver Code
 
# Given string str
str = "GeeksForGeeks";
 
# Function Call
printMiddleCharacter(str);
 
# This code is contributed by sapnasingh4991

C#

// C# program for the above approach
using System;
 
class GFG{
 
// Function that prints the middle
// character of a string
public static void printMiddlechar(String str)
{
     
    // Finding string length
    int len = str.Length;
 
    // Finding middle index of string
    int middle = len / 2;
 
    // Print the middle character
    // of the string
    Console.WriteLine(str[middle]);
}
 
// Driver Code
public static void Main(String []args)
{
     
    // Given string str
    String str = "GeeksForGeeks";
 
    // Function call
    printMiddlechar(str);
}
}
 
// This code is contributed by amal kumar choubey

输出：

o

时间复杂度： O(1)
辅助空间： O(1)

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