- C Programming Examples
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- C Print Hello World
- C Get Input from User
- C Print Integer
- C Add Two Numbers
- C Add Subtract Multiply Divide
- C Add n Numbers
- C Area Perimeter of Square
- C Area Perimeter of Rectangle
- C Area Circum of Circle
- C Fahrenheit to Celsius
- C Celsius to Fahrenheit
- C Inches to Centimeters
- C Kilogram to Gram
- C Reverse a Number
- C Swap Two Numbers
- C Interchange Numbers
- C Print ASCII Value
- C Print Fibonacci Series
- C Check Palindrome or Not
- C Check Armstrong or Not
- C Find Armstrong Numbers
- C Find nCr and nPr
- C Find Profit Loss
- C Sum of their Square
- C First & Last Digit Sum
- C Sum of All Digit
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- C Print Total Digit in Number
- C Check Perfect Number
- C Find Basic Gross Salary
- C Round Number to Integer
- C Print Series upto n Term
- C Find Factors of Number
- C if-else & Loop Programs
- C Check Even or Odd
- C Check Prime or Not
- C Check Alphabet or Not
- C Check Vowel or Not
- C Check Leap Year or Not
- C Is Reverse Equal Original
- C Make Calculator
- C Add Digits of Number
- Count Positive Negative Zero
- C Largest of Two Numbers
- C Largest of Three Numbers
- C Smallest of Two Numbers
- C Smallest of Three Numbers
- C Find Factorial of Number
- C Find LCM & HCF
- C Find LCM of n Numbers
- C Find HCF of n Numbers
- C Find Arithmetic Mean
- C Find Average, Percentage
- C Find Student Grade
- C Print Table of Number
- C Print Prime Numbers
- C Find Discount Purchase
- C Calculate Parcel Charge
- C Calculate Wage of Labor
- C Print Phone Bill
- C Conversion programs
- C Decimal to Binary
- C Decimal to Octal
- C Decimal to Hexadecimal
- C Binary to Decimal
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- C Octal to Decimal
- C Octal to Binary
- C Octal to Hexadecimal
- C Hexadecimal to Decimal
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- C Pattern Programs
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- C Print Diamond Pattern
- C Print Floyd's Triangle
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- C Array Programs
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- C Linear Search
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- C Largest Element in Array
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- C Second Largest/Smallest
- C Count Even Odd
- C Array Element at Even
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- C Print Even Array Elements
- C Print Odd Array Elements
- C Sum/Product of Even/Odd
- C Reverse an Array
- C Insert Element in Array
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- C Merge Two Arrays
- C Bubble Sort
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- C Insertion Sort
- C Print Common Elements
- C 2D Array Programs
- C Add Two Matrices
- C Subtract Two Matrices
- C Transpose a Matrix
- C Multiply Two Matrices
- C Sum All Matrix Elements
- C Largest Element in Matrix
- C Print Row Column Total
- C 3D Array Programs
- C String Programs
- C Print String
- C Find Length of String
- C Compare Two String
- C Copy a String
- C Concatenate String
- C Reverse a String
- C Count Vowels Consonants
- C Replace Vowel in String
- C Delete Vowels from String
- C Delete Word from String
- C Frequency of Character
- C Count Word in String
- C Remove Spaces from String
- C Sort a String
- C Sort String in Alphabetical
- C Sort Words in Ascending
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- C Uppercase to Lowercase
- C Lowercase to Uppercase
- C Swap Two Strings
- C Check Anagram or Not
- C Check Palindrome String
- C Print Number in Words
- C Print Successive Character
- C Character without Space
- C Remove Extra Spaces
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- C Write Content to File
- C Read & Display File
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- C List Files in Directory
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- C Delete a File
- C Misc Programs
- Generate Random Numbers
- C Print Date Time
- C Print Message with Time
- C Get IP Address
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- C Pass Array to Function
- Add Two Numbers using Pointer
- C Address of Variable
- C Shutdown Computer
- C Programming Tutorial
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# C Program to Find and Print All Factors of a Given Number

In this article, we will learn how to create a program in C that will ask the user to enter any number (at run-time) as input and find and print all the factors of that given number as output. Here is the program:

#include<stdio.h> #include<conio.h> int main() { int num, rem, i; printf("Enter any number: "); scanf("%d", &num); printf("\nFactors of %d:\n", num); for(i=1; i<num; i++) { if(num%i==0) printf("%d\n", i); } getch(); return 0; }

The program was written in the Code::Blocks IDE, and here is the sample run after a successful build and run. This is the first snapshot of the sample run:

Supply any number, say 24, to see all the factors of 24 after pressing the ENTER key:

Here are some of the main steps used in the above program:

- Receive any number as input, say 24.
- Create a for loop that runs from 1 to one less than the number, say 23 here (if input is 24).
- Inside the for loop, use the if block to apply the divisibility test of 24 to each and every number from 1 to 23.
- That is, if any of the numbers totally divide the given number, say 24, then print it out as a factor of the given number and continue to check for the next number.
- i is set to 1 during the first run of the for loop. 1 totally divides 24 without leaving any remainder; therefore, 1 will be one of the factors of 24.
- At the second run of the for loop, i holds 2. 2 totally divides 24 without leaving any remainder; therefore, 2 will also be one of the factors of 24.
- i hold 3 again on the third run. It also divides 24 without leaving any remainder, so 3 will also be one of the factors of 24.
- In the same way, check for all the numbers up to 23 and print them out if the number totally divides the given number, say 24, without leaving any remainder.

Now let's modify the above program in such a way that the program will print the total number of factors in a number-wise list. Here is the program. The question is: write a program in C to print all the factors of any given number given by the user at run-time. For example, if the user has provided 24 as input, The output must then look like this:

There are 7 factors of 24: [1] -> 1 [2] -> 2 [3] -> 3 [4] -> 4 [5] -> 6 [6] -> 8 [7] -> 12

The program given below is the answer to the above question:

#include<stdio.h> #include<conio.h> int main() { int num, rem, i, count=0; printf("Enter any number: "); scanf("%d", &num); for(i=1; i<num; i++) { if(num%i==0) count++; } printf("\nThere are %d factors of %d:\n", count, num); count=1; for(i=1; i<num; i++) { if(num%i==0) { printf("[%d] -> %d\n", count, i); count++; } } getch(); return 0; }

The following is the final snapshot of the above program's sample run:

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