- Write a program in C++ to calculate the sum of natural numbers.
- Write a C++ program to find sum of numbers between 1 to N.
- WAP in C++ to find sum of consecutive numbers using for loop.

**Natural Numbers** are counting numbers, that is 1, 2, 3, 4, 5... etc. Remember, zero and negative numbers are not part of natural numbers. In this program, we will take a positive number N as input from user and find the sum of all natural numbers between 1 to N(including 1 and N).

**Algorithm to calculate sum of natural numbers**

- Take number of elements(let it be N) as input from user using cin.
- Using a for loop, read N number from user and add them to a sum variable.
- Print the sum of all numbers using cout.

## C++ program o find sum of all numbers between 1 to N

/* * C++ Program to find sum of N Natural Numbers */ #include <iostream> using namespace std; int main(){ int N=0, num, i, sum=0; cout << "Enter the number of integers to add"; cin >> N; cout << "Enter " << N << " numbers seperated by space\n"; for(i= 0; i< N; i++){ cin >> num; sum = sum + num; } cout << "SUM = " << sum; return 0; }Output

Enter the number of integers to add: 6 Enter 5 numbers seperated by space 1 2 3 4 5 6 SUM = 21

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