C floor() function

C floor() function - Find Integer


double floor(double x)

The floor() function is used to calculate the largest integer that is less than or equal to x.


Name Description Required /Optional
x Floating-point value. Required

Return value from floor() function

  • Returns the floating-point result as a double value.

Example: floor() function

The following example shows the usage of floor() function.

#include <math.h>
#include <stdio.h>
int main(void)
   double x, y;
   x = 4.6;
   y = -4.6;
   printf("Before applying floor()");
   printf("\nx = %lf", x);
   printf("\ny = %lf", y);    
   x = floor(x);
   y = floor(y);
   printf("\n\nAfter applying floor()");
   printf("\nx = %lf", x);
   printf("\ny = %lf", y);    


Before applying floor()
x = 4.600000
y = -4.600000

After applying floor()
x = 4.000000
y = -5.000000

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C Programming: Tips of the Day

What's the point of const pointers?

const is a tool which you should use in pursuit of a very important C++ concept:

Find bugs at compile-time, rather than run-time, by getting the compiler to enforce what you mean.

Even though it does not change the functionality, adding const generates a compiler error when you're doing things you didn't mean to do. Imagine the following typo:

void foo(int* ptr)
    ptr = 0;// oops, I meant *ptr = 0

If you use int* const, this would generate a compiler error because you're changing the value to ptr. Adding restrictions via syntax is a good thing in general. Just don't take it too far -- the example you gave is a case where most people don't bother using const.

Ref : https://bit.ly/33Cdn3Q