c++ round number to 2 decimal places

To round a number to two decimal places in C++, you can make use of the std::setprecision and std::fixed functions from the <iomanip> library. Here's how you can do it:

1. Include the <iomanip> library at the beginning of your code:

#include <iomanip>

1. Use the std::setprecision function to set the precision to two decimal places:

double number = 3.14159;
std::cout << std::setprecision(2);

This line sets the output precision to two decimal places.

1. Use the std::fixed function to enforce fixed-point notation:

std::cout << std::fixed;

This line forces the output to be displayed in fixed-point notation.

1. Print the rounded number:

std::cout << number;

This line prints the rounded number to the desired precision.

Here's the complete example:

#include <iostream>
#include <iomanip>

int main() {
    double number = 3.14159;
    std::cout << std::setprecision(2);
    std::cout << std::fixed;
    std::cout << number;
    return 0;
}

This will output:

3.14

Note that setting the precision only affects the number that is being printed, not the actual value of the variable. The original value of the variable remains unchanged.