Description

To find frequency of a character in a string take a loop from start
to end and check how many times a given character present. In this
program, user will provide a string and a character as input and 
program give total number of occurrence of that character.

C/C++

/* C Program to find frequency of occurrence of a character*/
//Save it as FrequencyCharacters.c

#include<stdio.h>
int main(){

    char str[50], charVal;
    int i, count=0;

    printf("Enter a string : ");
    scanf("%s",str);
    fflush(stdin);

    printf("Enter the character for which frequency need to find : ");
    scanf("%c",&charVal);

    for(i=0;i<strlen(str);i++){
        if(str[i] == charVal){
            count++;
        }
    }

    printf("The total %c in %s is %d",charVal,str,count);

    return 0;
}

Input:
Enter a string : meera
Enter the character for which frequency need to find : e

Output:
The total e in meera is 2

Java

/* Java Program to find frequency of occurence of a character*/
//Save it as FrequencyCharacters.java

import java.io.*;
import java.util.Scanner;

public class FrequencyCharacters {

    public static void main(String[] args) {
        
            Scanner scanner = new Scanner(System.in);
        
            String str; 
            char charVal;
        int i, count=0;

        System.out.println("Enter a string : ");
        str = scanner.nextLine();

        System.out.println("Enter the character for which frequency need to find : ");
        charVal = scanner.next().charAt(0);

        for(i=0;i<str.length();i++){
            if(str.charAt(i) == charVal){
                count++;
            }
        }

        System.out.println("The total "+charVal+" in "+str+" is "+count);
    }
}

Input:
Enter a string : 
meera
Enter the character for which frequency need to find : 
e

Output:
The total e in meera is 2

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