Shorter than float?

[BruceJohnJennerLawso]

Im trying to do a simple output of position and speed in a program Im working on, but I find that the number of digits it outputs is too long with float, and too short with the short data type (only 1 digit as far as I can see). Ideally, I need a data type that stores four digits, so that my output can be something like

4.235 , 3.141

Is there a simple way of doing this, or will I need to write a function that trims the original data type & puts the numbers directly into a string?

[Disch]

You do not want your variable to be less precise.

What you want is to print your variable in a different way (ie: only print 4 digits, even though the variable itself can contain more)

Example:

1 2 3 4 5 6 7 8 9 10

#include <iostream> #include <iomanip> using namespace std; int main() { float var = 1.234567f; cout << setprecision(3) << var << endl; // only print 3 digits }

1.23

[BruceJohnJennerLawso]

Ah, actually the precision doesnt really matter in this case, since Im passing by value, but no matter

Im actually doing it as inserting it into a string though, how would the above call work in that case?

[Disch]

#include <sstream>
#include <iomanip>
#include <iostream>
using namespace std;

string tostr(float num, int precision)
{
    stringstream s;
    s << setprecision(precision) << num;
    return s.str();
}

int main()
{
    float f = 1.23456f;
    string s = tostr(f, 3);
    cout << s;
}

[BruceJohnJennerLawso]

Thanks Disch, that works perfectly :)