C++ Program to Find the Frequency of Characters in a String

Introduction

In this example, frequency of characters in a string object is computed.

To do this, size() function is used to find the length of a string object. Then, the for loop is iterated until the end of the string.

In each iteration, occurrence of character is checked and if found, the value of count is incremented by 1.

Example 1: Program to Find Frequency of Characters of a String Object

#include <iostream>
using namespace std;

int main()
{
    string str = "C++ Programming is awesome";
    char checkCharacter = 'a';
    int count = 0;

    for (int i = 0; i < str.size(); i++)
    {
        if (str[i] ==  checkCharacter)
        {
            ++ count;
        }
    }

    cout << "Number of " << checkCharacter << " = " << count;

    return 0;
}

Output

Number of a = 2

working

In the example below, loop is iterated until the null character '\0' is encountered. Null character indicates the end of the string. In each iteration, the occurrence of the character is checked.

Example 2: Find Frequency of Characters in a C-style String

#include <iostream>
using namespace std;
int main()
{
   char c[] = "C++ programming is not easy.", check = 'm';
   int count = 0;

   for(int i = 0; c[i] != '\0'; ++i)
   {
       if(check == c[i])
           ++count;
   }
   cout << "Frequency of " << check <<  " = " << count;
   return 0;
}

Output

Number of m = 2

Next Example

We hope that this Example helped you develop better understanding of the concept of "Find the Frequency of Characters in a String" in C++.

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In the next Example, we will learn about C++ Count Number of Vowels, Consonants & so on.