set precision in c++
To set precision in C++, you can use the std::setprecision
function from the <iomanip>
library. The std::setprecision
function allows you to specify the number of digits to be displayed after the decimal point. Here is an example of how to use it:
#include <iostream>
#include <iomanip>
int main() {
double number = 3.14159265359;
std::cout << std::setprecision(4) << number << std::endl;
return 0;
}
In this example, we have a variable number
with the value of pi (approximately 3.14159265359). By calling std::cout
with std::setprecision(4)
before number
, we are setting the precision to 4 decimal places. The output will be:
3.142
The std::setprecision
function takes an integer argument that represents the number of digits to be displayed after the decimal point. It affects the output of the std::cout
stream and can be used to format floating-point numbers. By default, the precision is set to 6 digits.
Please note that the std::setprecision
function affects the entire stream, so any subsequent floating-point numbers outputted using std::cout
will have the same precision unless explicitly changed.
I hope this explanation helps! Let me know if you have any further questions.