c++ round number down

To round a number down in C++, you can use the floor() function from the <cmath> library. Here are the steps to round a number down in C++:

1. Include the <cmath> library: To use the floor() function, you need to include the <cmath> library at the beginning of your code by including the line #include <cmath>.

2. Declare a variable: Declare a variable of the appropriate data type to store the number you want to round down. For example, you can declare a variable called number of type double.

3. Assign a value: Assign a value to the variable you declared in the previous step. For example, you can assign a value of 5.7 to the number variable.

4. Use the floor() function: Call the floor() function and pass the number you want to round down as an argument. The floor() function returns the largest integer less than or equal to the given number.

cpp double roundedNumber = floor(number);

The roundedNumber variable will now store the rounded down value of the number variable.

1. Print the result: You can use the cout statement to print the rounded down value of the number. For example:

cpp cout << "Rounded down number: " << roundedNumber << endl;

This will output the rounded down value of the number to the console.

Here is a complete example:

#include <iostream>
#include <cmath>

int main() {
    double number = 5.7;
    double roundedNumber = floor(number);

    std::cout << "Rounded down number: " << roundedNumber << std::endl;

    return 0;
}

When you run this code, it will output:

Rounded down number: 5

This is because the floor() function rounded down the value 5.7 to 5.