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C++ Program to find Sum of Natural Numbers

by suresh

Write a C++ Program to find the sum of natural numbers from 1 to n. This C++ program allows you to enter the maximum number to calculate the sum of natural numbers. Next, we used the while loop to iterate from 1 to n by incrementing the i value. Within the loop, we are adding each value of i to the sum and prints the sum.

#include<iostream>

using namespace std;

int main()
{
	int number, i = 1, sum = 0;
	
	cout << "\nPlease Enter the Number to find Sum of Natural Num  =  ";
	cin >> number;
	
	while( i <= number)
	{
		sum = sum + i;
		i++;
	}
			
	cout << "\nThe Sum of Natural Number from 1 to " << number << " = " << sum;

 	return 0;
}
C++ Program to find Sum of Natural Numbers 1

C++ Sum of Natural Numbers example code using Do While Loop.

#include<iostream>

using namespace std;

int main()
{
	int number, i = 1, sum = 0;
	
	cout << "\nPlease Enter the Number to find Sum of Natural Num  =  ";
	cin >> number;
	
	do
	{
		sum = sum + i;
		i++;		
	} while( i <= number);
			
	cout << "\nThe Sum of Natural Number from 1 to " << number << " = " << sum;

 	return 0;
}
C++ Program to find Sum of Natural Numbers 2

C++ Program to find Sum of Natural Numbers using For Loop

Here, we added one more cout statement inside the for loop: cout << “\n Iteration = ” << i << “, i = ” << i << “, sum = “<< sum << ” + ” << i << ” = “<< sum + i;. This statement helps you to understand the program in iteration wise.

#include<iostream>

using namespace std;

int main()
{
	int number, i = 1, sum = 0;
	
	cout << "\nPlease Enter the Number to find Sum of Natural Num  =  ";
	cin >> number;
	
	for(i = 1; i <= number; i++)
	{
		cout << "\n Iteration = " << i << ", i = " << i << ", sum = "<< sum << " + " << i << " = "<< sum + i;
		sum = sum + i;
		
	}
			
	cout << "\nThe Sum of Natural Number from 1 to " << number << " = " << sum;

 	return 0;
}
C++ Program to find Sum of Natural Numbers 3

C++ Program to calculate the Sum of Natural Numbers using Functions.

#include<iostream>

using namespace std;

int sumOfNaturalNumbers(int number)
{
	int sum = 0;
	
	for(int i = 1; i <= number; i++)
	{
		sum = sum + i;
		
	}
	return sum;
}
int main()
{
	int number;
	
	cout << "\nPlease Enter the Number to find Sum of Natural Num  =  ";
	cin >> number;
	
	int sum = sumOfNaturalNumbers(number);
			
	cout << "\nThe Sum of Natural Number from 1 to " << number << " = " << sum;

 	return 0;
}
C++ Program to find Sum of Natural Numbers 4

C++ Program to Calculate the Sum of Natural Numbers using a Math formula

As we all know, the mathematical formula to calculate the sum of natural numbers = number * (number + 1) / 2).

#include<iostream>

using namespace std;

int sumOfNaturalNumbers(int number)
{
	
	if(number == 0)
	{
		return number;
	}
	else
	{
		return (number * (number + 1) / 2);
	}
}
int main()
{
	int number;
	
	cout << "\nPlease Enter the Number to find Sum of Natural Num  =  ";
	cin >> number;
	
	int sum = sumOfNaturalNumbers(number);
			
	cout << "\nThe Sum of Natural Number from 1 to " << number << " = " << sum;

 	return 0;
}
C++ Program to Calculate Sum of Natural Numbers 5

C++ Program to Calculate the Sum of Natural Numbers using Recursion.

#include<iostream>

using namespace std;

int sumOfNaturalNumbers(int number)
{
	
	if(number == 0)
	{
		return number;
	}
	else
	{
		return (number + sumOfNaturalNumbers(number - 1));
	}
}
int main()
{
	int number;
	
	cout << "\nPlease Enter the Number to find Sum of Natural Num  =  ";
	cin >> number;
	
	int sum = sumOfNaturalNumbers(number);
			
	cout << "\nThe Sum of Natural Number from 1 to " << number << " = " << sum;

 	return 0;
}
C++ Program to Calculate Sum of Natural Numbers 6

Placed Under: CPP Examples

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  • 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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