Question

Write a C-program to print a table (shown below) showing how many times a digit appears in a number. The input number will be entered by the user. For example, if the user enters 378677189, then the output should be as follows:

Digit: 0 1 2 3 4 5 6 7 8 9

Frequency: 0 1 0 1 0 0 1 3 2 1

Remember to allow the users to enter their own choice of input number. [Hint: arrays could be useful. Also, a regular int data type may not be sufficient to hold such a big integer. Hence, think of using long data type.] Your program should start with asking the user to enter a number. Do not hard-code the input number.

Answer 1

#include <stdio.h>

int main() {
    int i, d, num, n, count;
    printf("Enter a number: ");
    scanf("%d", &n);
    printf("Digit: ");
    for (i = 0; i < 10; ++i) {
        printf("%d ", i);
    }
    printf("\nFrequency: ");
    for (i = 0; i < 10; ++i) {
        num = n;
        count = 0;
        if (num == 0 && i == 0) {
            count = 1;
        } else {
            while (num > 0) {
                d = num % 10;
                if (d == i) {
                    ++count;
                }
                num /= 10;
            }
        }
        printf("%d ", count);
    }
    printf("\n");
    return 0;
}