How to retain significant figures in C++?

9 months ago

Jackson Davis

2 minutes

One way to preserve the significant digits in C++ is to use the std::setprecision() function. This function is defined in the header file and is used to set the significant digits of floating-point numbers.

Here is a sample code:

#include <iostream>
#include <iomanip>

int main() {
    double number = 12.3456789;
    
    std::cout << std::setprecision(4) << number << std::endl;
    
    return 0;
}

In the above code, std::setprecision(4) sets the number of significant figures to 4, resulting in an output of 12.35. You can modify the parameter in the setprecision() function to set a different number of significant figures as needed.