Find frequency of all characters in a string

Posted on Apr 21, 2020

C program to find the frequency of all characters in a string.

Program

#include<stdio.h>
#include<conio.h>
#define MAX 50

void main()
{
    char str[MAX];
    int i, freq[256] = {0};

    printf("Enter the string\t:");
    gets(str);

    i = 0;
    while(str[i] != '\0')
    {
        freq[str[i]]++;
        i++;
    }

    for(i=0;i<256;i++)
    {
        if(freq[i] != 0)
        {
            printf("\nCharacter '%c' occurs %d times",i,freq[i]);
        }
    }

    getch();
}

Output

Enter the string        :welcome to coursecrux.com

Character ' ' occurs 2 times
Character '.' occurs 1 times
Character 'c' occurs 4 times
Character 'e' occurs 3 times
Character 'l' occurs 1 times
Character 'm' occurs 2 times
Character 'o' occurs 4 times
Character 'r' occurs 2 times
Character 's' occurs 1 times
Character 't' occurs 1 times
Character 'u' occurs 2 times
Character 'w' occurs 1 times
Character 'x' occurs 1 times