Accenture Coding Question 7

August 31, 2021

Coding Question 7

You are given a function, Void *ReplaceCharacter(Char str[], int n, char ch1, char ch2);

The function accepts a string ‘ str’ of length n and two characters ‘ch1’ and ‘ch2’ as its arguments . Implement the function to modify and return the string ‘ str’ in such a way that all occurrences of ‘ch1’ in original string are replaced by ‘ch2’ and all occurrences of ‘ch2’ in original string are replaced by ‘ch1’.

Assumption: String Contains only lower-case alphabetical letters.

Note:

Return null if string is null.
If both characters are not present in string or both of them are same , then return the string unchanged.

Example:

Input:
- Str: apples
- ch1:a
- ch2:p
Output:
- Paales

Explanation:

‘A’ in original string is replaced with ‘p’ and ‘p’ in original string is replaced with ‘a’, thus output is paales.

Python

C++

Java

#include <stdio.h>
#include <string.h>

void *ReplaceCharacter(char str[], int n, char ch1, char ch2)

{

    int i;

    for(i=0; i<n ; i++)

    {

        if(str[i]==ch1)

        {

            str[i]=ch2;

        }

        else if(str[i]==ch2)

        {

            str[i]=ch1;

        }

    }

    printf("%s",str);

}

int main()

{

    char a[100];

    char b, c;

    int len;

    scanf("%s",a);

    scanf("%s",&b);

    scanf("%s",&c);

    len = strlen(a);

    ReplaceCharacter(a, len, b, c);

    return 0;

}

Output:
apples
a
p
paales

Python

def swap (user_input, str1, str2):

    result = ''

    if user_input != None:

        result = user_input.replace(str1, '*').replace(str2, str1).replace('*', str2)

        return result

    return 'Null'

user_input = input()

str1, str2 = map(str,input().split())

print(swap(user_input, str1, str2))

Output:
apples
a p
paales

C++

#include <bits/stdc++.h>
using namespace std;

void ReplaceCharacter(string str,  char ch1, char ch2)

{

    int i;

    for(i=0; i<str.size() ; i++)

    {

        if(str[i]==ch1)

        {

            str[i]=ch2;

        }

        else if(str[i]==ch2)

        {

            str[i]=ch1;

        }

    }

    cout<<str;

}

int main()

{

    string str;

    char ch1, ch2;

    int len;
    
    cin>>str>>ch1>>ch2;

    ReplaceCharacter(str, ch1, ch2);

    return 0;

}

Java

import java.util.*;
class Solution 
{
    public static void replaceChar (String str, char ch1, char ch2) 
    {
        String res = "";

        for (int i = 0; i < str.length (); i++)
        {
            if (str.charAt (i) == ch1)
                res = res + ch2;
            else if (str.charAt (i) == ch2)
                res = res + ch1;
    	    else
                res = res + str.charAt (i);
        }
        System.out.println (res);
    }
 
    public static void main (String[]args) 
    {
        Scanner sc = new Scanner (System.in);
        String str = sc.next ();
        char ch1 = sc.next ().charAt (0);
        char ch2 = sc.next ().charAt (0);

        replaceChar (str, ch1, ch2);
    } 
}