Replace a character c1 with c2 and c2 with c1 in a string S

Given a string S, c1 and c2. Replace character c1 with c2 and c2 with c1.

Examples:

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

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

Traverse through the string and check for the occurrences of c1 and c2. If c1 is found then replace it with c2 and else if c2 is found replace it with c1.

C++



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// CPP program to replace c1 with c2
// and c2 with c1
#include <bits/stdc++.h>
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;
}

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Java














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// 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 



















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Python3














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# 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 



















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C#














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// 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 



















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PHP














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<?php 


// PHP program to replace c1  


// with c2 and c2 with c1 


function replace($s, $c1, $c2) 


{ 


    $l = strlen($s); 


  


    // loop to traverse 


    // in the string 


    for ($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 


$s = "grrksfoegrrks"; 


$c1 = 'e'; $c2 = 'r'; 


echo replace($s, $c1, $c2); 


  


// This code is contributed by anuj_67. 


?> 



















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Output:


geeksforgeeks



Time Complexity: O(n)



          
          
          

          

    

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    Article Tags : 
School Programming
Strings

           	
Practice Tags : 
Strings

        

         

         
 
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