Setting up precision C++ - c++

Question

So, i'm attempting to set the precision for input values in my code. I want the values to be printed with two decimal points afterwards of precision though i'm not exactly sure how.
Here's my code.
#include <iostream>
#include <iomanip>
float uphill, wellD, waterLvl, buckVol;
float buckAscRate, downHill, volume;
float last;
float timeReq;
int scene = 1;
void timeRequired()
{
std::setw(2);
std::setprecision(2);
std::cout << "Scenario " << scene << ":" << std::endl;
std::cout << "up hill" << " " << uphill << " sec" << std::endl;
std::cout << "well diamter" << " " << wellD << " in" << std::endl;
std::cout << "water level" << " " << waterLvl << " in" << std::endl;
std::cout << "bucket volume" << " " << buckVol << " cu ft" << std::endl;
std::cout << "bucket ascent rate" << " " << buckAscRate << " in/sec" << std::endl;
std::cout << "down hill" << " " << downHill << " sec" << std::endl;
std::cout << "required volume" << " " << volume << " cu ft" << std::endl;
timeReq = (uphill + downHill);
std::cout << "TIME REQUIRED" << " " << timeReq << " sec" << std::endl;
std::cout << " " << std::endl;
}
void scenarioCONT()
{
do
{
std::cin >> wellD;
std::cin >> waterLvl;
std::cin >> buckVol;
std::cin >> buckAscRate;
std::cin >> downHill;
std::cin >> volume;
std::cin >> last;
if (uphill <= 1) uphill = 2;
if (wellD <= 0) wellD = 1;
if (waterLvl <= 0) waterLvl = 1;
if (buckVol <= 0) buckVol = 1;
if (buckAscRate <= 0) buckAscRate = 1;
if (downHill <= 0) buckAscRate = 1;
if (volume <= 0) volume = 1;
if (last > 1)
{
uphill = last;
scenarioCONT();
}
} while (last != 0);
}
void scenario()
{
do
{
std::cin >> uphill;
std::cin >> wellD;
std::cin >> waterLvl;
std::cin >> buckVol;
std::cin >> buckAscRate;
std::cin >> downHill;
std::cin >> volume;
std::cin >> last;
if (uphill <= 1) uphill = 2;
if (wellD <= 0) wellD = 1;
if (waterLvl <= 0) waterLvl = 1;
if (buckVol <= 0) buckVol = 1;
if (buckAscRate <= 0) buckAscRate = 1;
if (downHill <= 0) buckAscRate = 1;
if (volume <= 0) volume = 1;
if (last > 1)
{
timeRequired();
uphill = last;
scenarioCONT();
}
scene++;
timeRequired();
} while (last != 0);
}
int main()
{
scenario();
system("pause");
}
I've been told to use ionmanip to set the precision, though i'm not 100% on how to do it. Any suggestions?

Answer 1

You can use std::setprecision function. The below example is directly taken from http://www.cplusplus.com/reference/iomanip/setprecision/
double f =3.14159;
std::cout << std::setprecision(5) << f << '\n';
std::cout << std::setprecision(9) << f << '\n';

Answer 2

If you want to output 2 decimal digits, you should use std::fixed, together with std::setprecision().
Take a look here.
For easier understanding, here is an example:
cout << setprecision(2)<< 3.1415; outputs 3.1 (2 digits in total) and
cout << setprecision(2)<<fixed<< 3.1415; outputs 3.14 (2 digits after floating point)