Count frequency of digits in an integer

Posted on Apr 7, 2020

C program to count frequency of digits in an integer.

Program

#include<stdio.h>
#include<conio.h>
void main()
{
	 long long num;
    int last_digit;
    int i, freq[10];

    printf("Enter the number\t:");
    scanf("%lld",&num);

    for(i=0; i<10; i++)
    {
        freq[i] = 0;
    }

    while(num>0)
    {
        last_digit = num % 10;
        num = num / 10;
        freq[last_digit]++;
    }

    for(i=0;i<10;i++)
    {
        printf("\nFrequency of %d = %d",i,freq[i]);
    }
    getch();
}

Output

Enter the number        :114220569800

Frequency of 0 = 3
Frequency of 1 = 2
Frequency of 2 = 2
Frequency of 3 = 0
Frequency of 4 = 1
Frequency of 5 = 1
Frequency of 6 = 1
Frequency of 7 = 0
Frequency of 8 = 1
Frequency of 9 = 1