c++ sum of all numbers up to a number
// 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;
}Write a CPP program to calculate sum of first N natural numbers
#include <iostream>
using namespace std;
int main(){
int N,i,sum=0;
cin>>N;
for(i=0;i<=N;)
{
sum=sum+N;
N--;
}
cout<<sum;
}Copyright © 2021 Codeinu
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