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//Calcular la siguiente suma
//S = 1 - 2 + 3 - 4 + 5 - ......... + / -N
#include <iostream>
#include <math.h>
using namespace std;
int main()
{
int i = 0, N = 0;
float sum = 0, num = 0;
cout << "Ingrese N: ";
cin >> N;
while (i < N)
{
i = i + 1;
if (i % 2 == 0) //Todos los pares restan
{
sum = sum - i;
}
else //Todos los impares suman
{
sum = sum + i;
}
}
cout << "La Suma es: " << sum << endl;
return 0;
}
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