trunc() : Truncation of number to get Integer part

#include <stdio.h>
int main() {
printf("Output = %.4f", trunc(14.23)); // Output = 14.0000
printf("\nOutput = %.4f", trunc(4.831)); // Output = 4.0000
printf("\nOutput = %.4f", trunc(-17.831)); // Output = -17.0000
printf("\nOutput = %.4f", trunc(-22.23)); // Output = -22.0000
return 0;
}

Example with float as inputs

#include <stdio.h>
#include <math.h>
int main(void){
     double    x,y;
     x=trunc(13.345);
     y=trunc(-12.456);

     printf("x=%lf , y=%lf", x,y);
     return 0;
}

x=13.000000, y=-12.000000

Example with float variables by using truncf()

#include <stdio.h>
#include <math.h>
int main(void){
     float x,y;
     x=truncf(13.345);
     y=truncf(-12.456);
     printf("x=%f , y=%f", x,y);
     return 0;
}

x=13.000000, y=-12.000000

Example by using truncl()

#include <stdio.h>
#include <math.h>
int main(void){
     float  x,y;
     x=truncl(13.345);
     y=truncl(-12.456);
     printf("x=%f , y=%f", x,y);
     return 0;
}

x=13.000000, y=-12.000000

trunc(x) 

Example 1: Truncating Positive and Negative Numbers

This example demonstrates how to use trunc() to truncate positive, negative, and zero values.

#include <stdio.h>
#include <math.h>

int main() {
    double num1 = 9.75, num2 = -9.75, num3 = 0.0;
    
    printf("trunc(%.2f) = %.2f\n", num1, trunc(num1));
    printf("trunc(%.2f) = %.2f\n", num2, trunc(num2));
    printf("trunc(%.2f) = %.2f\n", num3, trunc(num3));
    
    return 0;
}

trunc(9.75) = 9.00
trunc(-9.75) = -9.00
trunc(0.00) = 0.00

Example 2: Truncating Values with User Input

Allow users to input a number and see its truncated value using trunc().

#include <stdio.h>
#include <math.h>

int main() {
    double num;
    
    printf("Enter a number: ");
    scanf("%lf", &num);
    
    printf("The truncated value is: %.2f\n", trunc(num));
    
    return 0;
}

Enter a number: 14.89
The truncated value is: 14.00

Example 3: Truncating an Array of Numbers

This example truncates an array of floating-point numbers.

#include <stdio.h>
#include <math.h>

int main() {
    double nums[] = {3.14, -2.73, 5.99, -7.01};
    int n = sizeof(nums) / sizeof(nums[0]);
    
    for (int i = 0; i < n; i++) {
        printf("trunc(%.2f) = %.2f\n", nums[i], trunc(nums[i]));
    }
    
    return 0;
}

trunc(3.14) = 3.00
trunc(-2.73) = -2.00
trunc(5.99) = 5.00
trunc(-7.01) = -7.00