- C++ Programming Examples
- C++ Programming Examples
- C++: Hello World
- C++: Get Input
- C++: Print Integer
- C++: Add two numbers
- C++: Add, Sub, Multiply, Div
- C++: Add Digits
- C++: Find Average and Percentage
- C++: Find Arithmetic Mean
- C++: Sum of n Natural Numbers
- C++: Sum of n Numbers
- C++: Square's Area and Perimeter
- C++: Rectangle's Area and Perimeter
- C++: Triangle's Area and Perimeter
- C++: Area and Circumference
- 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 a Number
- C++: Find Factors of a Number
- C++: Find HCF and LCM
- C++: Create a Calculator
- C++: Count Digits in a Number
- C++: First and Last Digit Sum
- C++: Product of Number Digits
- 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
- C++: Check Reverse equals Original
- C++: Check Perfect Number
- C++: Check Palindrome or Not
- C++: Check Armstrong or Not
- C++: Divisibility Test
- C++: Find Labor Wage
- 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
- C++: Largest Element in an Array
- C++: Smallest Element in an Array
- C++: Find Second Largest Element
- C++: Find Second Smallest Element
- C++: Sum of All Elements
- C++: Multiply All Elements
- C++: Element in Even Position
- C++: Element in Odd Position
- C++: Print Even Numbers in Array
- C++: Print Odd Numbers in Array
- C++: Count Even or Odd Numbers
- C++: Sum of Even or Odd Numbers
- C++: Count Positive, Negative, Zero
- C++: Reverse an Array
- C++: Insert an Element
- C++: Delete an Element
- 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 String Length
- C++: Compare Two Strings
- C++: Copy String
- C++: String Concatenation
- C++: Reverse a String
- C++: Delete Vowels from a String
- C++: Delete a Word from a String
- C++: Count Characters in a String
- C++: Count Words in a String
- C++: Frequency of Words
- C++: Remove Spaces from Strings
- C++: Sort a String
- C++: Uppercase to Lowercase
- C++: Lowercase to Uppercase
- C++: Swap Two Strings
- C++: Check the Anagram or Not
- C++: Capitalize All Words in a String
- C++: Get Numbers from a String
- C++ File Programs
- C++: Read a File
- C++: Write Content to a File
- C++: Append Data to a File
- C++: Read and Display File
- C++: Copy a File
- C++: Merge Two Files
- Count Characters in a File
- C++: Capitalize Every Word
- C++: List Files in Directory
- C++: Delete a File
- C++: Encrypt and Decrypt a File
- C++ Misc Programs
- C++: Print ASCII Value
- C++: Add Binary Numbers
- C++: Generate Random Numbers
- C++: Print a Smiling Face
- C++: Days into Years and Months
- C++: Add Two Numbers using Pointer
- C++: Print Fibonacci Series
- C++: Generate Armstrong Numbers
- C++: Find nCr and nPr
- C++: Get IP Address
- C++: Print Date and Time
- C++: Shutdown and Restart Computer
- C++ Programming Tutorial
- C++ Tutorial
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 the user enters 10 as input, then the program prints its factors, which will be 1, 2, 5, and 10. These are the lists of programs covered in this article:
- Find the factors of a number using the while loop
- Find the factors of a number using the for loop
- Find factors of a number using a user-defined function
- Using class and object, determine the factors of a number
Find the factors of a number using the while loop
The question is, "Write a program in C++ that receives a number from the 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 the above C++ program on finding factors of a given number:
Now supply the input, say 100, and press the ENTER key to find and print all its factors as shown in the snapshot given below:
When the user enters a number, say 100, it gets initialized to num. Therefore num=100. Now execute the following block of code from the preceding program:
while(i<=num)
{
if(num%i==0)
cout<<i<<" ";
i++;
}
goes as follows (with i set to 1 and num set to 100):
- The condition i<=num or 1<=100 evaluates to true.
- Therefore, program flow goes inside the loop.
- The condition num%i==0 or 100%1==0 or 0==0 evaluates to true.
- Therefore, program flow goes inside the body of if, and the cout statement gets executed, which prints the value of i and a blank space.
- So 1 gets printed.
- The value of i is now increased. So i=2
- Again, the condition of the while loop gets evaluated.
- In other words, the condition i<=num or 2<=100 evaluates to true once more.
- Therefore, program flow again goes inside the loop.
- This process continues until the condition evaluated as false.
- In this way, all the factors of a given number get printed one by one.
Find factors of a number using the for loop
Let's create the same program as the previous program, but using a 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 a function
This program is created using a user-defined function named fact(). This function takes a given number as an argument and finds and prints the factors of the 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 and object
This is the last program of this article, created using classes, an object-oriented feature of C++.
#include<iostream> using namespace std; class fresherearth { private: int i; public: void fact(int n) { for(i=1; i<=n; i++) { if(n%i==0) cout<<i<<" "; } } }; int main() { fresherearth 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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