Float formatting in C++

Question

How do you format a float in C++ to output to two decimal places rounded up? I\'m having no luck with setw and setprecision as my compiler just tel

Answer 1

If you want the trailing zero from rounding, you can use the C function printf.

#include 
#include 

int main() {
    float v = 12.3961;
    std::printf("%.2f",v); //prints 12.40
}

Compared to:

#include 
#include 

int main() {
    float v = 12.3961;
    std::cout << std::setprecision(4) << v; //prints 12.4
}