• On May 9, 2020
• By Karmehavannan
• 0 Comment
• Categories: String
• Tags: Python 3.0

Python program: find the frequency of a character in a string

Python program: find the frequency of a character in a string

In this article, we will discuss the concept of the Python program: find the frequency of the given character in a string

In this post, we are going to learn how to  find the frequency of  the given character in the string in Python programming language

Find the frequency of  the given character in the string

find the frequency of  the given character in the string using for loop

The program allows the user to enter a String and then it finds the frequency of the given character in a given string using for loop in Python programing language

Program 1

#Python program to count Occurrence of a character in a string
string=input("Enter the string: ")
char=input("Please enter the char to find frequency of ta character\n")

count=0
for i in range(len(string)):
    if(string[i]==char):
        count=count+1
print("The frequency of the ",char,"in the string is: ",count)

When the above code is executed, it produces the following result

Enter the string: code for coding to coders
Please enter the char to find the frequency of the character
o
The frequency of the o in the string is: 5

Find the frequency of a character in a string using while loop

The program allows the user to enter a String and then it finds the frequency of the given character in a string using while loop in Python programing language

Program 2

#Python program to count Occurrence of a character in a string
string=input("Enter the string: ")
char=input("Please enter the char to find frequency of ta character\n")
count=0
i=0
while(i<len(string)):
    if(string[i]==char):
        count=count+1
    i=i+1
print("The frequency of the ",char,"in the string is: ",count)

When the above code is executed, it produces the following result

Enter the string: Python programming language
Please enter the char to find the frequency of the character
a
The frequency of the o in the string is: 3

Approaches

1. Declare str and ch variables;
2. Declare and initialize integer variables as count=0;
   
3. The user asked to enter a string
4. The given string is stored in the variable str;
5. The user asked to enter a character
6. The given character is stored in the variable ch;
7. A loop(for, while) is used to count frequency of the character in the given string using calculate the length of the string.
8. Use an if condition to test if(string[i]==char), when the if statements is true,  The count becomes count + 1( count = count +1);
9. When it is false, terminates the loop
10. Finally, the program displays the frequency of the given character of the given string

Find the frequency of a character in a string using the function

The program allows the user to enter a String and then it finds the frequency of the given character in a string using the function in Python programing language

Program 3

#Python program to count Occurrence of a character in a string
def count_Char(ch,str1):
   count=0
   for i in range(len(string)):
     if(string[i]==char):
         count=count+1
   return count;      
string=input("Enter the string: ")
char=input("Please enter the char to find frequency of ta character\n")

Total=count_Char(char,string)
print("The frequency of the ",char,"in the string is: ",Total)

When the above code is executed, it produces the following result

Enter the string: Python program oop
Please enter the char to find the frequency of ta character
o
The frequency of the o in the string is: 4

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