c floor function example

August 29, 2012 - Following is the syntax of the C library function floor() − ... This function returns the largest integral value not greater than x. Following is the basic C library example to see the demonstration of floor() function.

W3Schools

w3schools.com › c › ref_math_floor.php

C Math floor() Function

C Examples C Real-Life Examples ... printf("%f", floor(-5.9)); Try it Yourself » · The floor() function rounds a number DOWN to the nearest integer....

Discussions

Write your own implementation of math's floor function, C - Stack Overflow

Find centralized, trusted content and collaborate around the technologies you use most. Learn more about Collectives ... Bring the best of human thought and AI automation together at your work. Explore Stack Internal ... I was thinking about the floor function available in math.h. More on stackoverflow.com

stackoverflow.com

May 23, 2024

Does anyone know how to create a floor function in c

Can you not just cast it to an int? float f; int i; f = 4.6; i = (int)f; edit : learned about the html editor More on reddit.com

r/AskProgramming

11

0

January 5, 2025

Functions in SQL

If you have the ability to create a table, that would be a much better way to go. A permanent or temporary table will work, but permanent is preferred (so that you don't have recreate & refill the table every time, and others can see/use your table).

The table would look something like this:

0 19 '< 20' 20 29 '20-29' 30 39 '30-39' 40 49 '40-49' 50 59 '50-59' 60 255 '60+'

If the buckets could potentially shift over time, and you need to maintain historical accuracy, you can even add two more columns for the start and end date.

Here's how to create and fill the table (I don't know what flavor of SQL you're using, so I'll write it in SQL Server. There may be some small syntax differences):

create table dbo.Age_Buckets (
    Min_Age tinyint not null
    , Max_Age tinyint not null
    , Age_Bucket varchar(10) not null
    , primary key (Min_Age, Max_Age)
);

insert into
    dbo.Age_Buckets
values
    (0, 19, '<20')
    , (20, 29, '20-29')
    , (30, 39, '30-39')
    , (40, 49, '40-49')
    , (50, 59, '50-59')
    , (60, 255, '60+')
 ;

And here's how you'd use the table in your query:

select
    ad.ID -- Whatever you need from this table
    , ad.Age
    , ab.Age_Bucket
from
    Age_Data as ad
inner join
    Age_Buckets as ab
    on ad.Age between ab.Min_Age and ab.Max_Age
;

Videos

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YouTube

C Programming Math Library | Floor Function - YouTube

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round(), ceil(), floor() and trunc() double rounding functions ...

August 17, 2021

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Learn C math functions in 5 minutes! 🧮 - YouTube

March 1, 2025

youtube.com

Round() / Trunc() / CEIL() Floor() Function in C Programming Part-1| ...

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TechOnTheNet

techonthenet.com › c_language › standard_library_functions › math_h › floor.php

C Language: floor function (Floor)

In the C Language, the required ... floor of value */ result = floor(value); /* Display the result of the calculation */ printf("The floor of %f is %f\n", value, result); return 0; }...

GeeksforGeeks

geeksforgeeks.org › c language › c-floor-function

C floor() Function - GeeksforGeeks

July 7, 2024 - The floor(x) function takes a floating-point number x and returns the largest integer less than or equal to x. Internally, it checks the value of x and rounds it down to the nearest integer. If x is already an integer, it returns x itself.

Tutorial Gateway

tutorialgateway.org › c-floor-function

C floor Function

April 5, 2025 - #include <stdio.h> #include <math.h> int main() { printf("\n The Floor Value of 0.75 = %.2f ", floor(0.75)); printf("\n The Floor Value of 12.25 = %.2f ", floor(12.25)); printf("\n The Floor Value of 152.50 = %.2f ", floor(152.50)); printf("\n ...

Programiz

programiz.com › c-programming › library-function › math.h › floor

C floor() - C Standard Library

The function prototypes for the long double and float versions of the floor() function are: long double floorl(long double arg); float floorf(float arg); #include <stdio.h> #include <math.h> int main() { double num = -8.33; double result = floor(num); printf("Floor integer of %.2f = %.0f", ...

Microsoft Learn

learn.microsoft.com › en-us › cpp › c-runtime-library › reference › floor-floorf-floorl

floor, floorf, floorl | Microsoft Learn

October 3, 2025 - By default, this function's global state is scoped to the application. To change this behavior, see Global state in the CRT. For more compatibility information, see Compatibility. // crt_floor.c // This example displays the largest integers // less than or equal to the floating-point values 2.8 // and -2.8.

Scaler

scaler.com › home › topics › floor() in c

floor() Function in C - Scaler Topics

February 5, 2026 - This function returns the nearest ... to it as an argument. For example, if we pass a floating point number 5.6677 to the floor() function, the return value will be 5 (an integer)....

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Stack Overflow

stackoverflow.com › questions › 41856771 › write-your-own-implementation-of-maths-floor-function-c

Write your own implementation of math's floor function, C - Stack Overflow

Top answer

1 of 5

7

Both of your attempts have limitations:

If the double value is outside the range of the int type, converting to int is implementation defined.
If the double value is negative but integral, returning (int)num - 1 is incorrect.

Here is an (almost) portable version that tries to handle all cases:

double my_floor_2(double num) {
    if (num >= LLONG_MAX || num <= LLONG_MIN || num != num) {
        /* handle large values, infinities and nan */
        return num;
    }
    long long n = (long long)num;
    double d = (double)n;
    if (d == num || num >= 0)
        return d;
    else
        return d - 1;
}

It should be correct if type long long has more value bits than type double, which is the case on most modern systems.

2 of 5

5

No, you can't tackle it this way. The best way of writing your own implementation is to take the one from the C Standard Library on your platform. But note that might contain platform specific nuances so might not be portable.

The C Standard Library floor function is typically clever in that it doesn't work by taking a conversion to an integral type. If it did then you'd run the risk of signed integer overflow, the behaviour of which is undefined. (Note that the smallest possible range for an int is -32767 to +32767).

The precise implementation is also dependent on the floating point scheme used on your platform.

For a platform using IEEE754 floating point, and a long long type you could adopt this scheme:

If the magnitude of the number is greater than 2⁵³, return it (as it's already integral).
Else, cast to a 64-bit type (long long), and return it back.

Cppreference

en.cppreference.com › w › c › numeric › math › floor

floor, floorf, floorl - cppreference.com

June 16, 2024 - ... #include <math.h> #include <stdio.h> int main(void) { printf("floor(+2.7) = %+.1f\n", floor(2.7)); printf("floor(-2.7) = %+.1f\n", floor(-2.7)); printf("floor(-0.0) = %+.1f\n", floor(-0.0)); printf("floor(-Inf) = %+f\n", floor(-INFINITY)); } ... Retrieved from "https://en.cppreference....

Linux Hint

linuxhint.com › floor-function-in-c

Floor Function in C – Linux Hint

March 28, 2013 - From the output screenshot, we all can see that the program is running seamlessly. Several additional variations of inputs were used for testing to get a better understanding of the floor function: Now, for this example, let’s try passing negative decimal values to our floor function.

Cplusplus

cplusplus.com › reference › cmath › floor

Floor

3 weeks ago - double floor (double x); float floor (float x);long double floor (long double x); double floor (T x); // additional overloads for integral types · Round down value · Rounds x downward, returning the largest integral value that is not greater than x. Header <tgmath.h> provides a type-generic ...

W3Resource

w3resource.com › c-programming › math › c-floor.php

C floor() function

December 24, 2022 - The floor() function is used to calculate the largest integer that is less than or equal to x. ... Returns the floating-point result as a double value. ... The following example shows the usage of floor() function.

Ramesh Fadatare

rameshfadatare.com › home › c floor() function

C floor() Function

May 25, 2023 - #include <stdio.h> #include <math.h> int main() { double value; // Get user input for the value printf("Enter a value: "); scanf("%lf", &value); // Compute the floor of the value double result = floor(value); // Print the result printf("Floor of %.2f is: %.0f\n", value, result); return 0; } ... ...

reddit.com › r/askprogramming › does anyone know how to create a floor function in c

r/AskProgramming on Reddit: Does anyone know how to create a floor function in c

January 5, 2025 -

I'm working on a project that doesn't use any c libraries and can't figure it out