C Program to Find Factors of a Number using For loop | Function | Recursion | Pointers

C program to find factors of a number using for loop, function, recursion, pointers, and do-while loop.

In this article, you will learn how to find factors of a number in c using for loop, function, recursion, pointers, and do-while loop.

 

Example-1

 

Example-2

 

What are the factors of a number?

The factors of a number are defined as numbers that divided the original number without leaving any remainder (left reminder = 0).

 

You should have knowledge of the following topics in c programming to understand these programs:

• C main() function
• C printf() function
• C for loop statement
• C while loop statement
• C Functions
• C Pointers

 

In this article, we solve this problem in six methods:

1. Using the For loop
2. Using the Function
3. Using the Recursion
4. Using the Pointers
5. Using the While loop
6. Using the Do-while loop

C Program to Find Factors of a Number using For loop

// C Program to Find Factors of a Number using For loop
#include <stdio.h>

int main() {
    int x, i;

    printf("-----Enter the positive integer number-----\n");
    scanf("%d", &x);

    printf("\nThe factors of the %d are: ", x);
    for (i = 1; i <= x; ++i) {
        if (x % i == 0) {
            printf("%d ", i);
        }
    }
    printf("\n");
    return 0;
}

Run Program

Output

 

Explanation

In these given programs, we have taken input 90 a random number then applied the while loop and makes a calculation on this random number.

With It self reminder zero to find the possible factors of this random number.

The same calculation applied to the second program with for loop.

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C Program to Find Factors of a Number using Function

// C Program to Find Factors of a Number using Function
#include <stdio.h>

// This function will display the factors
void Factors(int x) {
    printf("\nThe factors of the %d are: ", x);
    for (int i = 1; i <= x; ++i) {
        if (x % i == 0) {
            printf("%d ", i);
        }
    }
    printf("\n");
}

// It's the driver function
int main() {
    int x;

    printf("-----Enter the positive integer number-----\n");
    scanf("%d", &x);

    Factors(x);
    return 0;
}

Run Program

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C Program to Find Factors of a Number using Recursion

// C Program to Find Factors of a Number using Recursion
#include <stdio.h>

// It's the recursive function
// It will display the factors
void Factors(int x, int i) {
    
    if (i <= x) {
        if (x % i == 0) {
            printf("%d ", i);
        }

        // Calling function itself to print the next number
        Factors(x, i + 1);
    }
}

// It's the driver function
int main() {
    int x;

    printf("-----Enter the positive integer number-----\n");
    scanf("%d", &x);

    printf("\nThe factors of the %d are: ", x);
    Factors(x, 1);
    printf("\n");
    return 0;
}

Run Program

Output

 

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C Program to Find Factors of a Number using Pointers

// C Program to Find Factors of a Number using Pointers
#include <stdio.h>

int main() {
    int x, i, *ptr;

    printf("-----Enter the positive integer number-----\n");
    scanf("%d", &x);

    // To swap the address of `x` variable
    ptr = &x;

    printf("\nThe factors of the %d are: ", x);
    for (i = 1; i <= *ptr; ++i) {
        if ((*ptr) % i == 0) {
            printf("%d ", i);
        }
    }
    printf("\n");
    return 0;
}

Run Program

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C Program to Find Factors of a Number using While loop

// C Program to Find Factors of a Number using While loop
#include <stdio.h>

int main() {
    int x, i = 1;

    printf("-----Enter the positive integer number-----\n");
    scanf("%d", &x);

    printf("\nThe factors of the %d are: ", x);
    while (i <= x) {
    	if (x % i == 0) {
            printf("%d ", i);
        }
        ++i;
    }
    printf("\n");
    return 0;
}

Run Program

Output

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C Program to Find Factors of a Number using Do While loop

// C Program to Find Factors of a Number using Do While loop
#include <stdio.h>

int main() {
    int x, i = 1;

    printf("-----Enter the positive integer number-----\n");
    scanf("%d", &x);

    printf("\nThe factors of the %d are: ", x);
    do {
        if (x % i == 0) {
            printf("%d ", i);
        }
        ++i;
    } while (i <= x);
    
    printf("\n");
    return 0;
}

Run Program

 

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