C++ trunc()

The trunc() function in C++ is used to truncate a floating-point value to its nearest integer towards zero. It takes one argument, which is the floating-point value to be truncated.

Here's the syntax of the trunc() function:

double trunc(double x);

The argument x is the floating-point value to be truncated. The function returns the truncated value as a double.

For example, if we have the floating-point value 3.8, trunc(3.8) will return 3.0. If we have the floating-point value -3.8, trunc(-3.8) will return -3.0.

Here's an example program that uses trunc():

#include <iostream>
#include <cmath>

int main() {
    double x = 3.8;
    std::cout << "Truncate " << x << " to " << trunc(x) << std::endl;
    x = -3.8;
    std::cout << "Truncate " << x << " to " << trunc(x) << std::endl;
    return 0;
}

In this program, we include the <cmath> header to use the trunc() function. We then declare a double variable x and assign it the value 3.8. We use trunc(x) to truncate x to the nearest integer towards zero and output the result using std::cout. We then repeat the process for the value -3.8.

When we run this program, we get the following output:

Truncate 3.8 to 3
Truncate -3.8 to -3

As we can see, the trunc() function effectively truncates floating-point values to their nearest integer towards zero.