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How do you write in c plus plus a series of n integers alternating plus and minus?
Wiki User
∙ 9y ago
An array or vector of int or double or any other signed type can achieve this. If the array must alternate, then simply traverse the array alternating the signs as you go:
std::vector<int> v = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
bool sign=true; // true is positive.
for (int i=0; i<9; ++i)
{
if (sign) { // value must be positive
if (v[i]<0) v[i] *= -1; // if negative, make positive
} else { // value must be negative
if (0<v[i]) v[i] *= -1; // if positive, make negative
}
sign = !sign; // switch sign for next iteration
}
Wiki User
∙ 9y ago
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