Question

Write a program to find the sum of all even numbers from 1 to n where the value of n is taken as input. [for example when n is 10 then the sum is 2+4+6+8+10 = 30] using only two variables

Answer 1

Program:

n = int(input("Enter a number"))

sum = 0

for i in range (1,(n+1),1):

   if int(i % 2) == 0:

       sum = sum + i

print("The sum is : ")

print(sum)

Output

Enter a number10

The sum is :  

30

Language

Python 3

-----Hope this helps   :)

Answer 2

Answer: C program is given below.

Concept : For loop and modulo operator

Given : Numbers are from 1 to n, and the program should be written using  

            only two variables.

To Find : Write a program to find the sum of all even numbers from 1 to n

               where the value of n is taken as input.

Explanation:

#include<stdio.h>

#include<conio.h>

int main(){

int n, sum = 0 ;

printf("Enter the value of n : ");

scanf("%d\n", &n);

while(n ! = 1){

if(n % 2 == 0){

sum = sum + n;

}

n = n - 1;

}

printf("\n Sum of all even numbers according to the condition is %d", sum);

getch();

}

Output :

Enter the value of n : 5

Sum of all even numbers is 6

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