Question

devise an Algorithm find and output the sum of all even numbers up to N

Answer 1

c programming algorithm

Answer 2

Algorithm:

Step 1: START

Step 2: Declare a variable N

Step 3: Take input from the user

Step 4: Declare a variable sum and initialize it with 0

Step 5: Start a loop from 2 upto N and increment the value of i by 2

for(int i = 2 ; i <= N ; i = i + 2)

Step 6: Add all the values in variable sum.

Step 7: Print the value of variable sum

Step 8: END

Program in C++:

#include<iostream>

using namespace std;

int main()

{

int N;

cout<<"Enter a number : ";

cin>>N;

int sum = 0;

for(int i = 2 ; i <= N ; i = i + 2)

{

 sum = sum + i;

}

cout<<"Sum of all even number upto "<<N<<" = "<<sum;

return 0;

}

Output:

Enter a number : 15

Sum of all even number upto 15 = 56