APC-PRAC-040.c

Metadata

• Author — Amit Dutta (amitdutta4255@gmail.com)
• Last updated — 12 Dec 2025
• License — MIT

Problem Statement

Problem Statement

Write a C program to count how many numbers between 100 and 999 have all distinct digits (e.g., 123, 709, 981).

Source Code

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#include <stdio.h>

int main()
{
    int i, count = 0, n1, n2, n3;
    printf("Distinct numbers between 100 and 999: ");
    for (i = 100; i <= 999; i++)
    {
        n1 = i / 100;
        n2 = (i % 100) / 10;
        n3 = i % 10;
        if (n1 != n2 && n2 != n3 && n1 != n3)
        {
            printf("%d  ", i);
            count++;
        }
    }
    printf("\nCount: %d\n", count);
    return 0;
}