C setprecision()

The setprecision() function in C is used to set the precision of floating-point numbers when they are printed. It is part of the <iomanip> library in C++ and is used in conjunction with the std::cout object to control the precision of floating-point output.

Here is an example of how to use the setprecision() function:

#include <iostream>
#include <iomanip>

int main() {
    double number = 3.14159;

    std::cout << std::setprecision(4) << number << std::endl;

    return 0;
}

In this example, the setprecision(4) function is used to set the precision of the output to 4 decimal places. The number variable is then printed using std::cout, and the output will be 3.1416.

Please note that the setprecision() function only affects the precision of the output and does not round the actual value of the floating-point number.