C Program to Display Factors of a Number

Here is a C program that displays the factors of a given number:

#include <stdio.h>

int main() {
    int number;
    
    // Prompt the user to enter a number
    printf("Enter a positive integer: ");
    scanf("%d", &number);
    
    if (number <= 0) {
        printf("Please enter a positive integer.\n");
    } else {
        printf("Factors of %d are: ", number);
        
        // Iterate from 1 to the number and check for factors
        for (int i = 1; i <= number; i++) {
            if (number % i == 0) {
                printf("%d ", i);
            }
        }
        
        printf("\n");
    }
    
    return 0;
} 

This program first asks the user to enter a positive integer. It then checks if the entered number is greater than 0. If it's not, it asks the user to enter a positive integer. If the input is a positive integer, the program proceeds to find and display its factors.

The factors of a number are the integers that can evenly divide the given number without leaving a remainder. To find the factors, we use a loop that iterates from 1 to the given number and checks whether the number is divisible by the current value of the loop variable (i). If it is divisible (number % i == 0), then i is a factor of the given number, and it is printed to the screen.

Here's an example of the program's output:

Enter a positive integer: 12
Factors of 12 are: 1 2 3 4 6 12

In this example, the factors of 12 are 1, 2, 3, 4, 6, and 12.