this code will help you, loop the vector and apply abs (function to find absolute value )
for(unsigned int i = 0; i < numbers.size(); i++)
{
if(numbers[i] < 0)numbers[i] *= -1; //make positive. _OR_ use numbers[i] = abs(numbers[i]);
std::cout<<numbers[i]<<std::endl;
}
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solved How do I compute absolute value of vector? [closed]