Floor() function in C

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The floor() function in C is part of the math library (math.h).

It's used to round down a given floating-point number to the nearest integer value less than or equal to it.

The floor() function in C, is found in the math.h library is used to round down a given floating-point number to the nearest integer value that is less than or equal to it.

It's particularly useful when precise integer values are needed from floating-point calculations, ensuring consistency in mathematical operations.

This function is commonly employed in various applications such as numerical analysis, scientific computing, and financial calculations.

Syntax for floor() in C:

#include<math.h> 
double floor(double x);

Implementation:

The floor() function takes a single argument x, which is the floating-point number to be rounded down.

It returns a double value representing the largest integer that is less than or equal to x.

Examples:

Program 1: Basic Usage

// Program for floor() in C
#include<stdio.h> 
#include<math.h> 

int main() {
    double num = 4.6;
    double result = floor(num);
    printf("Floor of %.2f is %.2f\n", num, result);
    return 0;
}

Output:

Floor of 4.60 is 4.00

Program 2: Using floor() for Truncation

 // Program for using floor() for trunction
#include<stdio.h> 
#include<math.h> 

int main() {
    double num = -5.8;
    double result = floor(num);
    printf("Truncated value of %.2f is %.2f\n", num, result);
    return 0;
}

Output: