The trunc()
function in C is a standard library function that truncates a given floating-point number to its integer part, effectively removing any fractional part. It is part of the C standard library (math.h
). This function is useful for performing mathematical operations where only the integer part of a number is needed.
Table of Contents
- Introduction
trunc()
Function Syntax- Understanding
trunc()
Function - Examples
- Truncating a Value
- Using
trunc()
with User Input
- Real-World Use Case
- Conclusion
Introduction
The trunc()
function calculates the integer part of a given floating-point number ( x ) by removing any fractional part. This function is widely used in mathematical computations and applications where only the integer part of a number is required.
trunc() Function Syntax
The syntax for the trunc()
function is as follows:
#include <math.h>
double trunc(double x);
Parameters:
x
: The floating-point value to be truncated.
Returns:
- The function returns the integer part of
x
as a floating-point number.
Understanding trunc() Function
The trunc()
function takes a floating-point number ( x ) and returns the integer part of ( x ) by discarding any fractional part. The result is the integer value closest to zero.
Examples
Truncating a Value
To demonstrate how to use trunc()
to truncate a value, we will write a simple program.
Example
#include <stdio.h>
#include <math.h>
int main() {
double value = 3.14;
// Compute the truncated value
double result = trunc(value);
// Print the result
printf("Truncated value of %.2f is: %.0f\n", value, result);
return 0;
}
Output:
Truncated value of 3.14 is: 3
Using trunc()
with User Input
This example shows how to use trunc()
to truncate a value provided by the user.
Example
#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 truncated value
double result = trunc(value);
// Print the result
printf("Truncated value of %.2f is: %.0f\n", value, result);
return 0;
}
Output (example user input "7.89"):
Enter a value: 7.89
Truncated value of 7.89 is: 7
Real-World Use Case
Calculating Whole Units in Inventory Management
In real-world applications, the trunc()
function can be used to calculate the number of whole units in inventory management, where fractional units are not counted.
Example: Calculating Whole Units
#include <stdio.h>
#include <math.h>
int main() {
double total_items;
int whole_units;
// Get user input for the total number of items
printf("Enter the total number of items: ");
scanf("%lf", &total_items);
// Calculate the number of whole units
whole_units = (int)trunc(total_items);
// Print the result
printf("Number of whole units: %d\n", whole_units);
return 0;
}
Output (example user input total items "125.75"):
Enter the total number of items: 125.75
Number of whole units: 125
Conclusion
The trunc()
function is essential for truncating a floating-point number to its integer part in C. It is useful in various mathematical calculations, particularly in fields like mathematics, finance, and engineering, where only the integer part of a number is required.
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