- C++ Programming Examples
- C++ Programming Examples
- C++ Hello World
- C++ Get Input
- C++ Print Integer
- C++ Add Two Numbers
- C++ Add Sub Mul Div
- C++ Add Digits
- C++ Find Average Perc
- C++ Find Arithmetic Mean
- C++ Sum of n Natural Numbers
- C++ Sum of n Numbers
- C++ Area Perimeter of Square
- C++ Area Perimeter of Rectangle
- C++ Area Perimeter of Triangle
- C++ Area Circum of Circle
- C++ Find Simple Interest
- C++ Fahrenheit to Celsius
- C++ Celsius to Fahrenheit
- C++ Print Prime Numbers
- C++ Reverse a Number
- C++ Swap Two Numbers
- C++ Print Multiplication Table
- C++ Find Factorial of Number
- C++ Find Factors of Number
- C++ Find HCF & LCM
- C++ Make Calculator
- C++ Count Digits in Number
- C++ Sum of First & Last Digit
- C++ Product of Digits of Number
- C++ Sum of Squares of Digits
- C++ Interchange Digits of Number
- C++ if else 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
- Check Reverse equal Original
- C++ Check Perfect Number
- C++ Check Palindrome or Not
- C++ Check Armstrong or Not
- C++ Divisibility Test
- C++ Find Wage of Labor
- C++ Find Discounted Price
- C++ Find Shipping Charge
- C++ Find Telephone Bills
- C++ Calculate Student Grade
- C++ Largest of Two Numbers
- C++ Largest of Three Numbers
- C++ Number Conversion
- C++ Decimal to Binary
- C++ Decimal to Octal
- C++ Decimal to Hexadecimal
- C++ Binary to Decimal
- C++ Binary to Octal
- C++ Binary to Hexadecimal
- C++ Octal to Decimal
- C++ Octal to Binary
- C++ Octal to Hexadecimal
- C++ Hexadecimal to Decimal
- C++ Hexadecimal to Binary
- C++ Hexadecimal to Octal
- C++ Pattern Programs
- C++ Pattern Programs
- C++ Print Diamond Pattern
- C++ Print Floyd's Triangle
- C++ Print Pascal's Triangle
- C++ Array Programs
- C++ 1D Array Program
- C++ Linear Search
- C++ Binary Search
- Find Largest Element in Array
- Find Smallest Element in Array
- Find Second Largest Element
- Find Second Smallest Element
- C++ Sum of All Elements
- C++ Multiply All Elements
- C++ Element on Even Position
- C++ Element on Odd Position
- C++ Print Even Numbers in Array
- C++ Print Odd Numbers in Array
- C++ Count Even/Odd Numbers
- C++ Sum of Even/Odd Numbers
- C++ Count Positive Negative Zero
- C++ Reverse an Array
- C++ Insert Element in Array
- C++ Delete Element from Array
- C++ Merge two Arrays
- C++ Bubble Sort
- C++ Selection Sort
- C++ Insertion Sort
- C++ Common Elements
- C++ 2D Array Programs
- C++ Add Two Matrices
- C++ Subtract Two Matrices
- C++ Transpose Matrix
- C++ Multiply Two Matrices
- C++ 3D Array Programs
- C++ String Programs
- C++ Print String
- C++ Find Length of String
- C++ Compare Two Strings
- C++ Copy String
- C++ Concatenate String
- C++ Reverse a String
- C++ Delete Vowels from String
- C++ Delete Word from String
- C++ Count Character in String
- C++ Count Word in String
- C++ Frequency of Word
- C++ Remove Spaces from String
- C++ Sort a String
- C++ Uppercase to Lowercase
- C++ Lowercase to Uppercase
- C++ Swap Two Strings
- C++ Check Anagram or Not
- C++ Capitalize All Words in String
- C++ Capitalize Specific Character
- C++ Get Numbers from String
- C++ File Programs
- C++ Read a File
- C++ Write Content to File
- C++ Append Data in File
- C++ Read & Display File
- C++ Copy a File
- C++ Merge Two Files
- Count Characters, Words in File
- C++ Capitalize All Words in File
- C++ List Files in Directory
- C++ Delete a File
- C++ Encrypt & Decrypt a File
- C++ Misc Programs
- C++ Print ASCII Value
- C++ Add Binary Numbers
- C++ Generate Random Numbers
- C++ Print Smiling Face
- C++ Days into Years, Months
- Add Two Numbers using Pointer
- C++ Print Fibonacci Series
- Generate Armstrong Numbers
- C++ Find nCr and nPr
- C++ Get IP Address
- C++ Print Date/Time
- C++ Shutdown, Restart Computer
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C++ Program to Find and Print Factors of a Number
This article provides some programs in C++ that find factors of a given number. For example, if user enters 10 as input, then the program prints its factors, that will be 1, 2, 5, 10. These are the list of programs covered in this article:
- Find factors of a number using while loop
- Find factors of a number using for loop
- Find factors of a number using user-defined function
- Find factors of a number using class and object
Find Factors of a Number using while Loop
The question is, write a program in C++ that receives a number from user as input and prints all its factors as output. The answer to this question is the program given below:
#include<iostream> using namespace std; int main() { int num, i=1; cout<<"Enter a Number: "; cin>>num; cout<<"\nFactors of "<<num<<" are:\n"; while(i<=num) { if(num%i==0) cout<<i<<" "; i++; } cout<<endl; return 0; }
The snapshot given below shows the initial output produced by above C++ program on finding factors of a given number:
Now supply the input say 100 as number and press ENTER
key to find and print all its factors like shown in the
snapshot given below:
When user enters the number say 100, it gets initialized to num. Therefore num=100. Now the dry run of following block of code, from above program:
while(i<=num)
{
if(num%i==0)
cout<<i<<" ";
i++;
}
goes like (with initial value of i as 1, and num=100):
- The condition i<=num or 1<=100 evaluates to be True
- Therefore program flow goes inside the loop
- The condition num%i==0 or 100%1==0 or 0==0 evaluates to be True
- Therefore program flow goes inside the body of if and the cout statement gets executed, that prints the value of i and a blank space
- So 1 gets printed
- Now the value of i gets incremented. So i=2
- Again the condition of while loop gets evaluated
- That is, the condition i<=num or 2<=100 evaluates to be True again
- Therefore program flow again goes inside the loop
- This process continues until the condition evaluates to be False
- In this way, all the factors of given number gets printed one by one
Find Factors of a Number using for Loop
Let's create the same program as of previous program, but using for loop this time.
#include<iostream> using namespace std; int main() { int num, i; cout<<"Enter a Number: "; cin>>num; cout<<"\nFactors of "<<num<<" are:\n"; for(i=1; i<=num; i++) { if(num%i==0) cout<<i<<" "; } cout<<endl; return 0; }
Find Factors of a Number using Function
This program is created using a user-defined function named fact(). This function takes given number as its argument and do the same job of finding and printing the factors of passed argument.
#include<iostream> using namespace std; void fact(int); int main() { int num; cout<<"Enter a Number: "; cin>>num; cout<<"\nFactors of "<<num<<" are:\n"; fact(num); cout<<endl; return 0; } void fact(int n) { int i=1; while(i<=n) { if(n%i==0) cout<<i<<" "; i++; } }
Find Factors of a Number using Class
This is the last program of this article, created using class, an object-oriented feature of C++.
#include<iostream> using namespace std; class CodesCracker { private: int i; public: void fact(int n) { for(i=1; i<=n; i++) { if(n%i==0) cout<<i<<" "; } } }; int main() { CodesCracker obj; int num; cout<<"Enter a Number: "; cin>>num; cout<<"\nFactors of "<<num<<" are:\n"; obj.fact(num); cout<<endl; return 0; }
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