将字符串S 中的字符c1 替换为 c2 并将 c2 替换为 c1

给定一个字符串S、c1 和 c2。将字符c1 替换为 c2 并将 c2 替换为 c1。
例子：

Input : grrksfoegrrks,
        c1 = e, c2 = r 
Output : geeksforgeeks 

Input : ratul,
        c1 = t, c2 = h 
Output : rahul

遍历字符串并检查 c1 和 c2 的出现。如果找到 c1，则将其替换为 c2，否则，如果找到 c2，则将其替换为 c1。

C++

// CPP program to replace c1 with c2
// and c2 with c1
#include 
using namespace std;
string replace(string s, char c1, char c2)
{
    int l = s.length();
 
    // loop to traverse in the string
    for (int i = 0; i < l; i++) {
 
        // check for c1 and replace
        if (s[i] == c1)
            s[i] = c2;
 
        // check for c2 and replace
        else if (s[i] == c2)
            s[i] = c1;
    }
    return s;
}
 
// Driver code to check the above function
int main()
{
    string s = "grrksfoegrrks";
    char c1 = 'e', c2 = 'r';
    cout << replace(s, c1, c2);
    return 0;
}

Java

// Java program to replace c1 with c2
// and c2 with c1
class GFG
{
     
static String replace(String s,
                    char c1, char c2)
{
    int l = s.length();
    char []arr = s.toCharArray();
     
    // loop to traverse in the string
    for (int i = 0; i < l; i++)
    {
     
        // check for c1 and replace
        if (arr[i] == c1)
            arr[i] = c2;
             
        // check for c2 and replace
        else if (arr[i] == c2)
            arr[i] = c1;
    }
     
    return String.valueOf(arr);
}
 
// Driver code
public static void main(String []args)
{
    String s = "grrksfoegrrks";
    char c1 = 'e', c2 = 'r';
    System.out.println(replace(s, c1, c2));
}
}
 
// This code is contributed
// by ChitraNayal

Python3

# Python3 program to replace c1 with c2
# and c2 with c1
def replace(s, c1, c2):
    l = len(s)
     
    # loop to traverse in the string
    for i in range(l):
         
        # check for c1 and replace
        if (s[i] == c1):
            s = s[0:i] + c2 + s[i + 1:]
         
        # check for c2 and replace
        elif (s[i] == c2):
            s = s[0:i] + c1 + s[i + 1:]
    return s
 
# Driver Code
if __name__ == '__main__':
    s = "grrksfoegrrks"
    c1 = 'e'
    c2 = 'r'
    print(replace(s, c1, c2))
 
# This code is contributed
# by PrinciRaj1992

C#

// C# program to replace c1 with c2
// and c2 with c1
using System;
public class GFG{
 
    static String replace(String s,
                        char c1, char c2)
    {
        int l = s.Length;
        char []arr = s.ToCharArray();
 
        // loop to traverse in the string
        for (int i = 0; i < l; i++)
        {
 
            // check for c1 and replace
            if (arr[i] == c1)
                arr[i] = c2;
                 
            // check for c2 and replace
            else if (arr[i] == c2)
                arr[i] = c1;
        }
 
        return string.Join("", arr);
    }
 
    // Driver code
    public static void Main()
    {
        String s = "grrksfoegrrks";
        char c1 = 'e', c2 = 'r';
        Console.WriteLine(replace(s, c1, c2));
    }
}
// This code is contributed by 29AjayKumar

Javascript

// Javascript program to replace c1 with c2
// and c2 with c1
     
    function replace(s,c1,c2)
    {
        let l = s.length;
    let arr = s.split("");
       
    // loop to traverse in the string
    for (let i = 0; i < l; i++)
    {
       
        // check for c1 and replace
        if (arr[i] == c1)
            arr[i] = c2;
               
        // check for c2 and replace
        else if (arr[i] == c2)
            arr[i] = c1;
    }
       
    return arr.join("");
    }
     
    // Driver code
    let s = "grrksfoegrrks";
    let c1 = 'e', c2 = 'r';
    document.write(replace(s, c1, c2));
     
    // This code is contributed by rag2127

输出：

geeksforgeeks

时间复杂度：O(n)