C program: Find the frequency of each character in the string

In this article, we will discuss the concept of the C program: Find the frequency of each character in the given string

In this post, we are going to learn how to find the frequency of the each character of the given string in C programming language

Java program: Find the frequency of each character in the string — Find the frequency of each character in the string

Code to find the frequency of the each character in the string

find the frequency of the each character in the string using for loop

The program allows the user to enter a String and then it finds the frequency of the each character in the given string using for loop in C programing language

program 1

#include <stdio.h>
#include <string.h>
int main()
{
    char str[100];
    int i;
    int freq[256]={0};
    printf("Enter a string\n");
    gets(str);
    for(i=0; str[i]!='\0'; i++){
        freq[str[i]]++;
    }
        for(i=0; i<256; i++){
        if(freq[i] !=0){
            printf("Character '%c' occurs %d time in te string\n",i,freq[i]);
        }
    }
    getch();
    return 0;
}

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

C program: Find the frequency of each character in the string — Find the frequency of each character using do-while loop

find the frequency of the each character in the string using while loop

The program allows the user to enter a String and then it finds the frequency of the each character in the given string using while loop in C programing language

program 2

#include <stdio.h>
#include <string.h>
int main()
{
    char str[100];
    int i;
    int freq[256]={0};
    printf("Enter a string\n");
    gets(str);
    i=0;
    while(str[i]!='\0'){
        freq[str[i]]++;
         i++;
    }
    i=0;
        while(i<256){
        if(freq[i] !=0){
            printf("Character '%c' occurs %d time in the string\n",i,freq[i]);
        }
        i++;
    }
    getch();
    return 0;
}

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

find the frequency of the each character in the string using do- while loop

The program allows the user to enter a String and then it finds the frequency of the each character in the given string using do-while loop in C programing language

program 3

#include <stdio.h>
#include <string.h>
int main()
{
    char str[100];
    int i;
    int freq[256]={0};
    printf("Enter a string\n");
    gets(str);
    i=0;
    do{
        freq[str[i]]++;
         i++;
}while(str[i]!='\0');
    i=0;
        do{
        if(freq[i] !=0){
            printf("Character '%c' occurs %d time in the string\n",i,freq[i]);
        }
        i++;
   } while(i<256);
    getch();
    return 0;
}

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