Accenture Coding Question 7

September 23, 2020

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.

#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
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