C++ program: find frequency of a character in the string

C++ program: find the frequency of a character in the string

In this article, we will discuss the concept of the C++ 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 C ++ programming language

C++ program: find frequency of a character in a string — Find the frequency of a character in a string

Code to 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 a character then it finds the frequency of the given character in the string using for loop in C++ programing language

program 1

#include <iostream>
#include <conio.h>
#include <stdio.h>
using namespace std;

int main()
{
    char str[100],ch;
    int fCount=0,i;

    cout<<"Enter a string!\n";
    gets(str);
    cout<<"Enter a character to find its frequency\n";
   cin>>ch;

   for(i=0; str[i]!='\0'; i++){
    if(str[i]==ch){ fCount++;
    }
   }
   cout<<"The frequency of "<<ch<<" is= "<<fCount;
   getch();
    return 0;
}

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

Enter a string
code for coding
Enter a character to find its frequency
o
The frequency of o is= 3

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 C++ programing language

Program 2

#include <iostream>
#include <conio.h>
#include <stdio.h>
using namespace std;

int main()
{
    char str[100],ch;
    int fCount=0,i;

    cout<<"Enter a string!\n";
    gets(str);
    cout<<"Enter a character to find its frequency\n";
   cin>>ch;
i=0;
   while(str[i]!='\0'){
    if(str[i]==ch){ fCount++;
    }
    i++;
   }
   cout<<"The frequency of "<<ch<<" is= "<<fCount;
   getch();
    return 0;
}

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

Enter a string
Cpp language supports OOPconcept
Enter a character to find its frequency
p
The frequency of p is= 5

Find the frequency of a character in a string using do-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 do-while loop in C++ programing language

Program 3

#include <iostream>
#include <conio.h>
#include <stdio.h>
using namespace std;

int main()
{
    char str[100],ch;
    int fCount=0,i;

    cout<<"Enter a string!\n";
    gets(str);
    cout<<"Enter a character to find its frequency\n";
   cin>>ch;
i=0;
   do{
    if(str[i]==ch){ fCount++;
    }
    i++;
   }while(str[i]!='\0');
   cout<<"The frequency of "<<ch<<" is= "<<fCount;
   getch();
    return 0;
}

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

Enter a string
cpp is a basic language
Enter a character to find its frequency
a
The frequency of a is= 4

Approaches

Declare a character array char str[100] and character variable char ch;
Declare and initialize integer variables as frequency=0;
The user asked to enter a string
The given string is stored in the variable str;
The user asked to enter a character
The given character is stored in the variable ch;
A loop(for, while and do-while) is used to count frequency of the character in the given string.
It is initialized as i=0, checks the condition whether str[i]!=’\0′); and executes the loop until the given condition becomes true
Use an if condition to test if(ch==str[i]), when the if statements is true, The frequency becomes frequency + 1( frequency = frequency +1);
When it is false, terminates the loop
Finally, the program displays the frequency of the given character of the given string