interview questions

Program to find character occurrence in string

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Hello

In this article, we will see how to find the frequency of characters in a given string. This program to find character occurrence in a string is a popular question asked in technical job interview.

Problem statement

Given a string or list of words, you are required to find occurrence of each characters frequency.

Python code to find  character occurrence in string

def findCharOccurence(str):
	if(len(str)==0):
		return "Invalid String"

	str_List= list(str.lower())
	temp = []
	count=0

	w, h = 2, len(str);
	data = [[0 for x in range(w)] for y in range(h)] 
	j=0
	while(j<len(str)):
		if(str_List[j] not in temp):
			countS= str_List.count(str_List[j])
			data[j][0]=str_List[j]
			data[j][1]=countS
			temp.append(str_List[j])
			count+=1

		j+=1

	w, h = 2, count;
	data2 = [[0 for x in range(w)] for y in range(h)] 
	k=0
	m=0
	while(k<len(str_List)):
		if(data[k][0]!=0):
			data2[m][0]=data[k][0]
			data2[m][1]=data[k][1]
			m+=1
		k+=1
 	
	return data2

print(findCharOccurence("tajmahal"))


End note

In the article, you have seen how to find character occurrence in string in Python.

If in case you have doubt regarding implementation, please feel free to share us your concerns in discussion thread below, or mail us to info@xamnation.com

This article is for technical interview preparation. Find more useful programming exercises in link below.

  • How to check whether string is palindrome or not
  • How to find prime numbers between a given range
  • How to check whether number is Armstrong number

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