### Output data in columns

I am currently trying to write a code in which I will have information displayed in two different columns. The first column will be the population in thousands, ( going from 10 to 25), while the second column will be the flowrate associated with the corresponding number of people. I'm having trouble incorporating a function of the form Q = 3.86 sqrtP (1-0.01sqrtP) where P is the population in thousands. Any help or advice would be useful. Thank you.

#include <iostream>
#include <string>
#include <math.h>

using namespace std;

int main()
{
int lowerBound = 10;
int upperBound = 25;
int population;

cout << "Enter the lower bound of population in thousands (1 = 1000, 10 = 10000, etc.):" << lowerBound << endl;
cout << "Enter the upper bound of population in thousands (1 = 1000, 10 = 10000, etc.):" << upperBound << endl;

for (int i = 10 ; i <= 25 ; i++)
{
cout << "Population in thousands " << i << ":" << endl;
cin >> population;

cout.setf(ios::fixed);
cout.setf(ios::showpoint);
cout.precision(4);

}

This is the code I have thus far. I'm assuming that I will need to declare the function prior to the loop?
 ``12345678`` ``````#include // function of the form Q = 3.86 sqrtP (1-0.01sqrtP) where P is the population in thousands. double Q( double population_in_thousands ) { const double sqrt_p = std::sqrt(population_in_thousands) ; return 3.86 * sqrt_p * ( 1.0 - 0.01*sqrt_p ) ; }``````
Thank you. I have implemented that piece of code into my existing one. I am now having trouble figuring out how to place the return value of the formula into the flowrate column. Here is an updated look at the code I have so far.

#include <iostream>
#include <string>
#include <cmath>
#include <iomanip>

using namespace std;

//function of the form Q = 3.86 sqrtP (1 - 0.01sqrtP) where P is the population in thousands.

double Q (double population_in_thousands)
{
const double sqrt_p = std::sqrt (population_in_thousands);
return 3.86 * sqrt_p * (1.0 - 0.01 * sqrt_p);
}

int main()
{
int lowerBound = 10;
int upperBound = 25;

cout << "Enter the lower bound of population in thousands (1 = 1000, 10 = 10000, etc.):" << lowerBound << endl;
cout << "Enter the upper bound of population in thousands (1 = 1000, 10 = 10000, etc.):" << upperBound << endl;
cout << setw(10) << "Population in thousands " <<
setw(10) << "Flowrate" << endl;

for (int i = 10 ; i <= 25 ; i++)
{
cout << i << endl;

cout.setf(ios::fixed);
cout.setf(ios::showpoint);
cout.precision(4);

}

return 0;
 ``12345678910111213141516171819202122232425262728`` ``````#include #include #include // function of the form Q = 3.86 sqrtP (1-0.01sqrtP) where P is the population in thousands. double flow_rate( double population_in_thousands ) { const double sqrt_p = std::sqrt(population_in_thousands) ; return 3.86 * sqrt_p * ( 1.0 - 0.01*sqrt_p ) ; } int main() { int lower_bound ; std::cout << "Enter the lower bound of population in thousands (1 = 1000, 10 = 10000, etc.): " ; std::cin >> lower_bound ; int upper_bound ; std::cout << "Enter the upper bound of population in thousands (1 = 1000, 10 = 10000, etc.): " ; std::cin >> upper_bound ; std::cout << '\n' << std::fixed << std::setprecision(4) << std::setw(15) << "Population" << std::setw(10) << "Flowrate" << '\n' << std::setw(15) << "----------" << std::setw(10) << "--------" << '\n' ; for( int i = lower_bound ; i <= upper_bound ; ++i ) std::cout << std::setw(8) << i << ",000" << std::setw(12) << flow_rate(i) << '\n' ; }``````
Last edited on
Thank you.