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C++ Program to Check Perfect Number

by suresh

Write a C++ Program to Check Perfect Number with an example. Any number can be perfect if the sum of its divisors (excluding the actual number) equal to the number. For instance, 6 is divisible by 1, 2, 3 (excluding 6) and the sum of 1 + 2 + 3 = 6. So, 6 is a perfect number.

In this C++ perfect number example, we used for loop (for(i = 1 ; i < number ; i++)) to iterate from 1 to number. We used the if condition (if(number % i == 0)) to check whether the number divisible by loop value equals 0. If true, add that value to the sum. Finally, we used the If condition (if(number == sum)) to check whether the number equal to the sum and print the result.

#include<iostream>

using namespace std;

int main()
{
	int number, i, sum = 0;
	
	cout << "Please Enter the Number to check for Perfect  =  ";
	cin >> number;
	
	for(i = 1 ; i < number ; i++)
	{
		if(number % i == 0)
		{
			sum = sum + i;
		}
	}
			
	if(number == sum)
	{
		cout << number << " is a Perfect Number";
	}
	else
	{
		cout << number << " is Not a Perfect Number";
	}
 	return 0;
}
C++ Program to Check Perfect Number 1

C++ Program to Check Perfect Number using a While loop

#include<iostream>

using namespace std;

int main()
{
	int number, i = 1, sum = 0;
	
	cout << "Please Enter the Number to check for Perfect  =  ";
	cin >> number;
	
	while( i < number )
	{
		if(number % i == 0)
		{
			sum = sum + i;
		}
		i++;
	}
			
	if(number == sum)
	{
		cout << number << " is a Perfect Number";
	}
	else
	{
		cout << number << " is Not a Perfect Number";
	}
 	return 0;
}
C++ Program to Check Perfect Number 2

C++ Program to print Perfect Numbers from 1 to N

This C++ perfect number example allows the user to enter the minimum and maximum values. Next, it prints the perfect numbers between min and max value.

#include<iostream>

using namespace std;

int main()
{
	int minimum, maximum, number, i, sum;
	
	cout << "Enter Minimum and Maximum to find Perfect Numebrs =  ";
	cin >> minimum >> maximum;
	
	cout << "\nPerfect Numbers Between " << minimum << " and " << maximum << " = ";
	for(number = minimum; number <= maximum; number++)
	{
		for(i = 1, sum = 0; i < number ; i++)
		{
			if(number % i == 0)
			{
				sum = sum + i;
			}
		}
		if(number == sum) 
		{
			cout << number << " ";
		}
	}
	
 	return 0;
}
C++ Program to Check Perfect Number 3

Placed Under: CPP Examples

  • C++ Print Hello World
  • C++ Add Two Numbers
  • C++ Count Notes in Amount
  • C++ Find Last Digit of a Number
  • C++ Largest of Two Nums
  • C++ Largest of Three Nums
  • C++ LCM of Two Numbers
  • C++ Leap Year
  • C++ Number Divisible by 5 & 11
  • C++ Palindrome Number
  • C++ Perfect Number
  • C++ Prime Factors of a Number
  • C++ Print 1 to 100
  • C++ Print Alphabets from A and Z
  • C++ Print Alphabets from a to z
  • C++ Print Even Numbers
  • C++ Print Multiplication Table
  • C++ Print N Natural Numbers
  • C++ Print Odd Numbers
  • C++ Product of Digits in a Num
  • C++ Profit or Loss Program
  • C++ Reverse a Number
  • C++ Simple Interest
  • C++ Square of a Number
  • C++ Square Root of a Number
  • C++ Standard Deviation
  • C++ Strong Number
  • C++ Student Marks Program
  • C++ Student Grade Program
  • C++ Sum of Digits in Number
  • C++ Sum of Even Numbers
  • C++ Sum of Even & Odd
  • C++ Sum of Odd Numbers
  • C++ Swap Two Numbers
  • C++ Natural Nums in Reverse
  • C++ Sum of Natural Numbers
  • C++ Sum of number 1st, last digit
  • C++ Swap of 1st & last digit
  • C++ Sum of Series 1²+2²+3²+n²
  • C++ Sum of Series 1³+2³+3³+n³
  • C++ ASCII Values of all Chars
  • C++ Sum of Char array ASCII val
  • C++ Sum of String ASCII values
  • C++ String Length
  • C++ Convert String to Lowercase
  • C++ Convert String to Uppercase
  • C++ Toggle String Char Cases
  • C++ Convert CM to Meters & KM
  • C++ Convert KM to M, CM & MM
  • C++ Convert days to year & Week
  • C++ Add Two Arrays
  • C++ Add Two Matrixes
  • C++ Array Arithmetic Operations
  • C++ Check 2 Matrixes are Equal
  • C++ Determinant of a Matrix
  • C++ Identity Matrix
  • C++ Matrix Arithmetic Operation
  • C++ Multiply Two Arrays
  • C++ Subtract two Matrixes
  • C++ Matrix Diagonal Interchange
  • C++ Matrix Lower Triangle
  • C++ Matrix Scalar Multiplication
  • C++ Matrix Transpose
  • C++ Matrix row & column sum
  • C++ Matrix Opp Diagonal sum
  • C++ Multiply two Matrixes
  • C++ Matrix Upper Triangle
  • C++ Sparse Matrix
  • C+ Symmetric Matrix
  • C++ Sum of Matrix Diagonal
  • C++ Vol & Surf Area of Cone
  • C++ Vol & Surf Area of Cube
  • C++ Vol & Surf Area of Cuboid
  • C++ Vol & Surf Area of Cylinder
  • C++ Vol & Surf Area of Sphere
  • C++ Inverted Star Pyramid
  • C++ Square Star Pattern
  • C++ Triangle is Equilateral Isosceles or Scalene
  • C++ Triangle is Valid using Angle
  • C++ Triangle is Valid using Sides
  • C++ Perimeter of a Rectangle
  • C++ Max Occur String Character
  • C++ Hollow Box Number Pattern
  • C++ Print 1 and 0 Row Pattern
  • C++ Print Pascal Triangle
  • C++ Rectangle Star Pattern
  • C++ Square Number Pattern
  • C++ Print 1, 0 Column Pattern

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