Write a program that asks the user to input two strings: an input string and a"pattern" string. Both strings contain only lowercase alphabet, and the"pattern" string is shorter than the input string. The program finds and countsnumber of occurrences of the "pattern" string in the input string, assuming thatthe number of occurrences is less than 10. The program replaces the firstcharacter of the first appearance of the "pattern" string in the input string by '1'and the first character of the second appearance of the "pattern" string in theinput string by '2' and so on so forth. Finally, the program outputs two strings:the original input string and the modified string, a string in a line, ended withnewline.
Question
Write a program that asks the user to input two strings: an input string and a"pattern" string. Both strings contain only lowercase alphabet, and the"pattern" string is shorter than the input string. The program finds and countsnumber of occurrences of the "pattern" string in the input string, assuming thatthe number of occurrences is less than 10. The program replaces the firstcharacter of the first appearance of the "pattern" string in the input string by '1'and the first character of the second appearance of the "pattern" string in theinput string by '2' and so on so forth. Finally, the program outputs two strings:the original input string and the modified string, a string in a line, ended withnewline.
Solution
Here is a Python program that accomplishes the task:
def find_and_replace(input_string, pattern_string):
count = 0
modified_string = input_string
while pattern_string in modified_string and count < 10:
count += 1
index = modified_string.find(pattern_string)
modified_string = modified_string[:index] + str(count) + modified_string[index+1:]
return input_string, modified_string
input_string = input("Enter the input string: ")
pattern_string = input("Enter the pattern string: ")
original_string, modified_string = find_and_replace(input_string, pattern_string)
print(original_string)
print(modified_string)
This program first defines a function find_and_replace that takes an input string and a pattern string. It initializes a count to 0 and creates a copy of the input string to be the modified string. It then enters a loop that continues as long as the pattern string is in the modified string and the count is less than 10. In each iteration of the loop, it increments the count, finds the index of the first occurrence of the pattern string in the modified string, and replaces the character at that index with the current count. After the loop, it returns the original input string and the modified string.
The program then asks the user to input the input string and the pattern string, calls the find_and_replace function with these strings, and prints the original and modified strings.
Similar Questions
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