Count the number occurrences of a character in a string

Question

What's the simplest way to count the number of occurrences of a character in a string?

e.g. count the number of times 'a' appears in 'Mary had a little lamb'

Answer 1

Return the number of non-overlapping occurrences of substring sub in the range [start, end]. Optional arguments start and end are interpreted as in slice notation.

>>> sentence = 'Mary had a little lamb'
>>> sentence.count('a')

Answer 2

Another way could be:

Given a string and a character, the task is to make a function that counts the occurrence of the given character in the string.

Examples:

Input : str = "endtoend"
         c = 'e'
Output : 2
'e' appears four times in str.

Input : str = "abccdefgaa"
          c = 'a' 
Output : 3
'a' appears three times in str.

// C++ program to count occurrences of a given // character #include <iostream> #include <string> using namespace std; // Function that return count of the given // character in the string int count(string s, char c) { // Count variable int res = 0; for (int i=0;i<s.length();i++) // checking character in string if (s[i] == c) res++; return res; } // Driver code int main() { string str= "edureka"; char c = 'e'; cout << count(str, c) << endl; return 0; } Output: 2

Answer 3

The string count() method returns the number of occurrences of a substring in the given string. In simple words, count() method searches the substring in the given string and returns how many times the substring is present in it.