Count Frequency of Character in String

Count Frequency of Character in String” is a basic problem of string data structure. Here, we are given a string of length ‘n’ and our task is to write a program to count how many times a particular character occurs in the string.

Example:

Input: 
Enter a string: abcdrfedsdfddgr
Enter character : d
Output:
The number of occurrences of d in abcdrfedsdfddgr is 3

The simplest solution of the above problem is to traverse the given string and count each occurrence of the given character in the string.


C++ Program to Count Frequency of Character in String is as follows:

/* Program to Count Frequency of Character in String */
#include<bits/stdc++.h> 
#define len 1000 
using namespace std;  
int main()   
{  
    char str[len];  
    cout<<"Enter the string:\n";  
    cin>>str;  
    char ch;  
    cout<<"Enter a character:\n";  
    cin>>ch;  
    int count = 0;  
    /* Loop to traverse the string and 
    count the occurrences of the character 
    in the string */  
    for(int i = 0;i < len && str[i]!='
/* Program to Count Frequency of Character in String */
#include<bits/stdc++.h> 
#define len 1000 
using namespace std;  
int main()   
{  
char str[len];  
cout<<"Enter the string:\n";  
cin>>str;  
char ch;  
cout<<"Enter a character:\n";  
cin>>ch;  
int count = 0;  
/* Loop to traverse the string and 
count the occurrences of the character 
in the string */  
for(int i = 0;i < len && str[i]!='\0'; i++)  
{  
if(str[i] == ch)  
count++;  
}  
cout<<"\nThe number of occurrences of "<<ch<<" in "<<str<<" is "<<count;  
}  
'; i++) { if(str[i] == ch) count++; } cout<<"\nThe number of occurrences of "<<ch<<" in "<<str<<" is "<<count; }
OUTPUT:
Enter the string: Helpmestudybro
Enter a character: e
The number of occurrences of e in Helpmestudybro is 2
Time Complexity:
O(n), where n is the length of the string.

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