Write a CPP program to calculate sum of first N natural numbers

// Method 1: Mathematical -> Sum up numbers from 1 to n 
int sum(int n){
	return (n * (n+1)) / 2;
}

// Method 2: Using a for-loop -> Sum up numbers from 1 to n 
int sum(int n){
	int tempSum = 0; 
  	for (int i = n; i > 0; i--){
     	tempSum += i;  
    }
  	return tempSum; 
}

// Method 3: Using recursion -> Sum up numbers from 1 to n 
int sum(int n){
	return n > 0 ? n + sum(n-1) : 0; 
}

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Awgiedawgie 440220 points

                                    
#include &lt;iostream&gt;

using namespace std;

int main(){
	int N,i,sum=0;
	cin&gt;&gt;N;
     for(i=0;i&lt;=N;)
     {
         sum=sum+N;
        N--;
     }
     cout&lt;&lt;sum;
}

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Write a CPP program to calculate sum of first N natural numbers

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