c++ round number to whole

To round a number to a whole number in C++, you can use the round() function from the <cmath> library. The round() function returns the nearest integer value to the given number.

Here are the steps to round a number to a whole number in C++:

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

#include <cmath>

1. Declare a variable to store the number you want to round:

double number = 3.14;

1. Use the round() function to round the number to the nearest integer:

double roundedNumber = round(number);

1. If you want to convert the rounded number to an integer type, you can use the static_cast operator:

int roundedInteger = static_cast<int>(roundedNumber);

The static_cast operator converts the value of roundedNumber to an integer type.

Here's the complete example:

#include <cmath>

int main() {
   double number = 3.14;
   double roundedNumber = round(number);
   int roundedInteger = static_cast<int>(roundedNumber);

   // Print the rounded integer
   std::cout << roundedInteger << std::endl;

   return 0;
}

In this example, the number 3.14 is rounded to the nearest whole number, which is 3. The rounded integer value is then printed to the console.

Please note that the round() function rounds the number to the nearest whole number according to the rounding rules of the current locale. If you want to round the number towards zero (truncate the decimal part), you can use the floor() or ceil() function instead, depending on your specific rounding requirements.