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Question

Напишите программу которая выводит сумму последовательности чисел 1 - 2 + 3 - 4 + 5 - 6 + 7 - ... и так далее до введенного числа n включительно.

Входные данных
Вводится одно натуральное число n - количество чисел.

Выходные данные
Выводится одно число - сумма чисел.

Примечание
Можно решить это задачу с использованием условного оператор, а можно и без него.

Sample Input 1:

5
Sample Output 1:

3
Sample Input 2:

100
Sample Output 2:

-50
https://code.sololearn.com/cGAcQB3s1uuy/?ref=app

Answer 1

A tip: in the programming world you are going to work with a lot of people all over the world and to communicate with each other we use english. If you don't know english I think it will be really important to learn it, also, you will get answers more quickly since more people can understand your question.

Unfortunately I can't understand your question but you can solve this problem with a factor that has value either 1 or -1 and multiply by the number since you do minus plus minus plus minus ... (1-2+3-4+5-6...). If you instead start with 0+1-2+3... In every number you can multiply the factor by -1 (1*(-1) = -1 and (-1)*(-1)=1) and add to the sum the number*factor. I called.it signal on my code:

https://code.sololearn.com/cDr5BRJFhra7/?ref=app

I don't know if I could answer your question but Keep the good coding :)